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Neural Development

Overview of brain development

The brain emerges during embryonic development from the neural tube, an early embryonic structure. The most anterior part of the neural tube is called the telencephalon, which expands rapidly due to cell proliferation, and eventually gives rise to the brain. Gradually some of the cells stop dividing and differentiate into neurons and glial cells, which are the main cellular components of the brain. The newly generated neurons migrate to different parts of the developing brain to self-organize into different brain structures. Once the neurons have reached their regional positions, they extend axons and dendrites, which allow them to communicate with other neurons via synapses. Synaptic communication between neurons leads to the establishment of functional neural circuits that mediate sensory and motor procesing, and underlie behavior.

Highly schematic flowchart of human brain development.

Aspects of neural development

Some landmarks of neural development include the birth and differentiation of neurons from stem cell precursors, the migration of immature neurons from their birthplaces in the embryo to their final positions, outgrowth of axons and dendrites from neurons, guidance of the motile growth cone through the embryo towards postsynaptic partners, the generation of synapses between these axons and their postsynaptic partners, and finally the lifelong changes in synapses, which are thought to underlie learning and memory.

Typically, these neurodevelopmental processes can be broadly divided into two classes: activity-independent mechanisms and activity-dependent mechanisms. Activity-independent mechanisms are generally believed to occur as hardwired processes determined by genetic programs played out within individual neurons. These include differentiation, migration and axon guidance to their initial target areas. These processes are thought of as being independent of neural activity and sensory experience. Once axons reach their target areas, activity-dependent mechanisms come into play. Although synapse formation is an activity-independent event, modification of synapses and synapse elimination requires neural activity.

Developmental neuroscience uses a variety of animal models including mice Mus musculus , the fruit fly Drosophila melanogaster , the zebrafish Danio rerio, Xenopus laevis tadpoles and the worm Caenorhabditis elegans, among others.

Neural induction

During early embyonic development the ectoderm becomes specified to give rise to the epidermis (skin) and the neural plate. The conversion of undifferentiated ectoderm to neuro-ectoderm requires signals from the mesoderm. At the onset of gastrulation presumptive mesodermal cells move through the dorsal blastopore lip and form a layer in between the endoderm and the ectoderm. These mesodermal cells that migrate along the dorsal midline give rise to a structure called the notochord. Ectodermal cells overlying the notochord develop into the neural plate in response to a signal to a diffusible signal produced by the notochord. The remainder of the ectoderm gives rise to the epidermis (skin). The ability of the mesoderm to convert the overlying ectoderm into neural tissue is called Neural Induction.

The neural plate folds outwards during the third week of gestation to form the neural groove. Beginning in the future neck region, the neural folds of this groove close to create the neural tube. The formation of the neural tube from the ectoderm is called Neurulation. The anterior (front) part of the neural tube is called the basal plate; the posterior (rear) part is called the alar plate. The hollow interior is called the neural canal. By the end of the fourth week of gestation, the open ends of the neural tube (the neuropores) close off.

Identification of neural inducers

A transplanted blastopore lip can convert ectoderm into neural tissue and is said to have an inductive effect. Neural Inducers are molecules that can induce the expression of neural genes in ectoderm explants without inducing mesodermal genes as well. Neural induction is often studied in Xenopus embryos since they have a simple body pattern and there are good markers to distinguish between neural and non-neural tissue. Examples of Neural Inducers are the molecules Noggin and Chordin.

When embryonic ectodermal cells are cultured at low density in the absence of mesodermal cells) they undergo neural differentiation (express neural genes), suggesting that neural differentiation is the default fate of ectodermal cells. In explant cultures (which allow direct cell-cell interactions) the same cells differentiate into epidermis. This is due to the action of BMP4 (a TGF- family protein) that induces ectodermal cultures to differentiate into epidermis. During neural induction, Noggin and Chordin are produced by the dorsal mesoderm (notochord) and diffuse into the overlying ectoderm to inhibit the activity of BMP4. This inhibition of BMP4 causes the cells to differentiate into neural cells.

Regionalization

Late in the fourth week, the superior part of the neural tube flexes at the level of the future midbrainhe mesencephalon. Above the mesencephalon is the prosencephalon (future forebrain) and beneath it is the rhombencephalon (future hindbrain).

The optical vesicle (which will eventually become the optic nerve, retina and iris) forms at the basal plate of the prosencephalon. The alar plate of the prosencephalon expands to form the cerebral hemispheres (the telencephalon) whilst its basal plate becomes the diencephalon. Finally, the optic vesicle grows to form an optic outgrowth.

Patterning of the nervous system

In chordates, dorsal ectoderm forms all neural tissue and the nervous system. Patterning occurs due to specific environmental conditions - different concentrations of signaling molecules

Dorsoventral axis

The ventral half of the neural plate is controlled by the notochord, which acts as the 'organiser'. The dorsal half is controlled by the ectoderm plate which flanks the neural plate on either side.

Ectoderm follows a default pathway to become neural tissue. Evidence for this comes from single, cultured cells of ectoderm which go on to form neural tissue. This is postulated to be because of a lack of BMPs, which are blocked by the organiser. The organiser may produce molecules such as follistatin, noggin and chordin which inhibit BMPs.

The ventral neural tube is patterned by Shh from the notochord, which acts as the inducing tissue. The Shh inducer causes differentiation of the floor plate. Shh-null tissue fails to generate all cell types in the ventral tube, suggesting Shh is necessary for its induction. The hypothesised mechanism suggests that Shh binds patched, relieving patched inhibition of smoothend, leading to activation of gli transcription factors.

In this context Shh acts as a morphogen - it induces cell differentiation dependent on its concentration. At low concentrations it forms ventral interneurones, at higher concentrations it induced motor neurone development, and at highest concentrations it induces floor plate differentiation. Failure of Shh-modulated differentiation causes haloprosencephaly.

The dorsal neural tube is patterned by BMPs from the epidermal ectoderm flanking the neural plate. These induce sensory interneurones by activating Sr/Thr kinases and altering SMAD transcription factor levels.

Rostrocaudal axis

Dorsoventral induction of ventral tissue expresses characteristic forebran tissue. Other signals manipulate posterior tissues differentiation, including FGF and retinoic acid.

The hindbrain, for example, is patterned by Hox genes, which are expressed in overlapping domains along the anteroposterior axis. The 5' genes in this cluster and expressed most posteriorly. Hoxb-1 is expressed in rhombomere 4 and gives rise to the facial nerve. Without this Hoxb-1 expression, a nerve which is similar to the trigeminal nerve arises.

Neuronal migration

Corticogenesis: younger neurons migrate past older ones using radial glia as a scaffolding. Cajal-Retzius cells (red) release reelin (orange).

Neuronal migration is the method by which neurons travel from their origin or birth place to their final position in the brain. There are several ways they can do this, e.g. by radial migration or tangential migration. (see time lapse sequences of radial migration (also known as glial guidance) and somal translocation.)

Tangential migration of interneurons from ganglionic eminence.

Radial migration Neuronal precursor cells proliferate in the ventricular zone of the developing neocortex. The first postmitotic cells to migrate form the preplate which are destined to become Cajal-Retzius cells and subplate neurons. These cells do so by somal translocation. Neurons migrating with this mode of locomotion are bipolar and attachs the leading edge of the process to the pia. The soma is then transported to the pial surface by nucleokinesis, a process by which a microtubule "cage" around the nucleus elongates and contracts in association with the centrosome to guide the nucleus to its final destination. Radial glia, whose fibers serve as a scaffolding for migrating cells, can itself divide or translocate to the cortical plate and differentiate either into astrocytes or neurons. Somal translocation can occur at any time during development.

Subsequent waves of neurons split the preplate by migrating along radial glial fibres to form the cortical plate. Each wave of migrating cells travel past their predecessors forming layers in an inside-out manner, meaning that the youngest neurons are the closest to the surface. It is estimated that glial guided migration represents 90% of migrating neurons in human and about 75% in rodents.

Tangential migration Most interneurons migrate tangentially through multiple modes of migration to reach their appropriate location in the cortex. An example of tangential migration is the movement of interneurons from the ganglionic eminence to the cerebral cortex. One example of ongoing tangential migration in a mature organism, observed in some animals, is the rostral migratory stream connecting subventricular zone and olfactory bulb.

Others modes of migration There is also a method of neuronal migration called multipolar migration. This is seen in multipolar cells, which are abundantly present in the cortical intermediate zone. They do not resemble the cells migrating by locomotion or somal translocation. Instead these multipolar cells express neuronal markers and extend multiple thin processes in various directions independently of the radial glial fibers.

Neurotrophic factors

The survival of neurons is regulated by survival factors, called trophic factors. The neurotrophic hypothesis was formulated by Victor Hamburger and Rita Levi Montalcini based on studies of the developing nervous system. Victor Hamburger discovered that implanting an extra limb in the developing chick led to an increase in the number of spinal motor neurons. Initially he thought that the extra limb was inducing proliferation of motor neurons, but he and his colleagues later showed that there was a great deal of motor neuron death during normal development, and the extra limb prevented this cell death. According to the neurotrophic hypothesis, growing axons compete for limiting amounts of target-derived trophic factors and axons that neurons that fail to receive insufficient trophic support die by apoptosis. It is now clear that factors produced by a number of sources contribute to neuronal survival.

Nerve Growth Factor (NGF): Rita Levi Montalcini and Stanley Cohen purified the first trophic factor, Nerve Growth Factor (NGF), for which they received the Nobel Prize. There are three NGF-related trophic factors: BDNF, NT3, and NT4, which regulate survival of various neuronal populations. The Trk proteins act as receptors for NGF and related factors. Trk is a receptor tyrosine kinase. Trk dimerization and phosphorylation leads to activation of various intracellular signaling pathways including the MAP kinase, Akt, and PKC pathways.

CNTF: Ciliary neurotrophic factor is another protein that acts as a survival factor for motor neurons. CNTF acts via a receptor complex that includes CNTFR, GP130, and LIFR. Activation of the receptor leads to phosphorylation and recruitment of the JAK kinase, which in turn phosphorylates LIFR. LIFR acts as a docking site for the STAT transcription factors. JAK kinase phosphorylates STAT proteins, which dissociate from the receptor and translocate to the nucleus to regulate gene expression.

GDNF: Glial derived neurotrophic factor is a member of the TGFb family of proteins, and is a potent trophic factor for striatal neurons. The functional receptor is a heterodimer, composed of type 1 and type 2 receptors. Activation of the type 1 receptor leads to phosphorylation of Smad proteins, which translocate to the nucleus to activate gene expression.

Synapse formation

Neuromuscular junction Much of our understanding of synapse formation comes from studies at the neuromuscular junction. The transmitter at this synapse is acetylcholine. The acetylcholine receptor (AchR) is present at the surface of muscle cells before synapse formation. The arrival of the nerve induces clustering of the receptors at the synapse. McMahan and Sanes showed that the synaptogenic signal is concentrated at the basal lamina. They also showed that the synaptogenic signal is produced by the nerve, and they identified the factor as Agrin. Agrin induces clustering of AchRs on the muscle surface and synapse formation is disrupted in agrin knockout mice. Agrin transuces the signal via MuSK receptor to rapsyn. Fischbach and colleagues showed that receptor subunits are selectively transcribed from nuclei next to the synaptic site. This is mediated by neuregulins.

In the mature synapse each muscle fiber is innervated by one motor neuron. However, during development many of the fibers are innervated by multiple axons. Lichtman and colleagues have studied the process of synapses elimination. This is an activity-dependent event. Partial blockage of the receptor leads to retraction of corresponding presynaptic terminals.

CNS synapses Agrin appears not to be a central mediator of CNS synapse formation and there is active interest in identifying signals that mediate CNS synaptogenesis. Neurons in culture develop synapses that are similar to those that form in vivo, suggesting that synaptogenic signals can function properly in vitro. CNS synaptogenesis studies have focused mainly on glutamatergic synapses. Imaging experiments show that dendrites are highly dynamic during development and often initiate contact with axons. This is followed by recruitment of postsynaptic proteins to the site of contact. Stephen Smith and colleagues have shown that contact initiated by dendritic filopodia can develop into synapses.

Induction of synapse formation by glial factors: Barres and colleagues made the observation that factors in glial conditioned media induce synapse formation in retinal ganglion cell cultures. Synapse formation in the CNS is correlated with astrocyte differentiation suggesting that astrocytes might provide a synaptogenic factor. The identity of the astrocytic factors is not yet known.

Neuroligins and SynCAM as synaptogenic signals: Sudhof, Serafini, Scheiffele and colleagues have shown that neuroligins and SynCAM can act as factors that will induce presynaptic differentiation. Neuroligins are concentrated at the postsynaptic site and act via neurexins concentrated in the presynaptic axons. SynCAM is a cell adhesion molecule that is present in both pre- and post-synaptic membranes.

Synapse elimination

Several motorneurones compete for each neuromuscular junction, but only one survives till adulthood. Competition in vitro has been shown to involve a limited neurotrophic substance that is released, or that neural activity infers advantage to strong post-synaptic connections by giving resistance to a toxin also released upon nerve stimulation. In vivo it is suggested that muscle fibres select the strongest neuron through a retrograde signal.

See also

Neural development in humans

Axon guidance

Pioneer neuron

Neural Darwinism

Neurodevelopmental disorder

Pre- and perinatal psychology

Brain development timelines

References

^ Estomih Mtui; Gregory Gruener (2006). Clinical Neuroanatomy and Neuroscience. Philadelphia: Saunders. pp. 1. ISBN 1-4160-3445-5. 

^ Jessell, Thomas M.; Kandel, Eric R.; Schwartz, James H. (2000). "Chapter 55". Principles of neural science (4th ed.). New York: McGraw-Hill. ISBN 0-8385-7701-6. 

^ a b Nadarajah B, Brunstrom J, Grutzendler J, Wong R, Pearlman A (2001). "Two modes of radial migration in early development of the cerebral cortex". Nat Neurosci 4 (2): 14350. doi:10.1038/83967. PMID 11175874. http://www.nature.com/neuro/journal/v4/n2/full/nn0201_143.html. 

^ Samuels B, Tsai L (2004). "Nucleokinesis illuminated". Nat Neurosci 7 (11): 116970. doi:10.1038/nn1104-1169. PMID 15508010. 

^ Tamamaki N, Nakamura K, Okamoto K, Kaneko T (September 2001). "Radial glia is a progenitor of neocortical neurons in the developing cerebral cortex". Neurosci. Res. 41 (1): 5160. doi:10.1016/S0168-0102(01)00259-0. PMID 11535293. http://linkinghub.elsevier.com/retrieve/pii/S0168010201002590. 

^ Miyata T, Kawaguchi A, Okano H, Ogawa M (September 2001). "Asymmetric inheritance of radial glial fibers by cortical neurons". Neuron 31 (5): 72741. doi:10.1016/S0896-6273(01)00420-2. PMID 11567613. http://linkinghub.elsevier.com/retrieve/pii/S0896-6273(01)00420-2. 

^ Nadarajah B, Parnavelas J (2002). "Modes of neuronal migration in the developing cerebral cortex". Nat Rev Neurosci 3 (6): 42332. doi:10.1038/nrn845. PMID 12042877. 

^ Rakic P (1972). "Mode of cell migration to the superficial layers of fetal monkey neocortex". J Comp Neurol 145 (1): 6183. doi:10.1002/cne.901450105. PMID 4624784. 

^ Letinic K, Zoncu R, Rakic P (June 2002). "Origin of GABAergic neurons in the human neocortex". Nature 417 (6889): 6459. doi:10.1038/nature00779. PMID 12050665. 

^ a b Tabata H, Nakajima K (5 November 2003). "Multipolar migration: the third mode of radial neuronal migration in the developing cerebral cortex". J Neurosci 23 (31): 999610001. PMID 14602813. http://www.jneurosci.org/cgi/content/full/23/31/9996. 

^ Nadarajah B, Alifragis P, Wong R, Parnavelas J (2003). "Neuronal migration in the developing cerebral cortex: observations based on real-time imaging". Cereb Cortex 13 (6): 60711. doi:10.1093/cercor/13.6.607. PMID 12764035. http://cercor.oxfordjournals.org/cgi/content/full/13/6/607. 

External links

Myers, P.Z., 2004. "Neurulation in Zebrafish" in Pharyngula .

Neural Development (peer-reviewed open access journal).

v  d  e

Prenatal development/Mammalian development of nervous system (GA 9.733)

General neural development/

neurulation/neurula

Notochord  Neuroectoderm  Neural plate  Neural folds  Neural groove

Neural crest (Cranial, Trunk, Cardiac)  Neural tube (Neuromere/Rhombomere, Cephalic flexure, Pontine flexure)

Alar plate (sensory)  Basal plate (motor)

Glioblast  Neuroblast

note: mostly ecoderm, but mesoderm is precursor for epineurium, perineurium, and endoneurium

central nervous system navs: anat/physio/dev, noncongen/congen/neoplasia, symptoms+signs/eponymous, proc

Categories: Developmental biology | Embryology | Nervous system | Developmental neuroscience
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Cet 20032140 Iphone 4 Compatible Lcd Flex Connector $28.6 Replace your damaged or broken LCD screen display FPC connector with our brand new LCD flex connector for iPhone 4. The LCD flex connector for iPhone 4 is the perfect repair part to get your iPhone 4 LCD screen display working like new Our LCD flex connector for iPhone 4 is conveniently easy to install and there is no complicated assembly required. This item takes between 721 days to ship/arrive because it ships out of Hong Kong or China.

LCD Flex Cable Connector for Nokia 6280 6288 $10 Description:LCD Flex Cable replacement for Nokia 6280 6288It's the connecting cable that link different parts in your deviceIf your screen changes to white or turn on and off often, then you probably need to replace the Flex CableThis Nokia 6280 Flex Cable, Nokia 6288 Flex Cable in brand new and working conditionWe don't have installation guide for this, but it might be possible to find it on the internet.Taking the parts away is not easy, please consider whether you can do it before your purchaseCaution: This is static sensitive devices, not to be handled by unauthorized personnelThis is non-OEM generic productWeight: 10g

Newest VGA Signal Generator LCD Repair Tester free EMS Ship world PayPal accept $36.84 Newest VGA Signal Generator LCD Repair Tester Ship world PayPal accept,input DC7-12V

Ergotron Neo-Flex Extend LCD Arm $95.99 18.50" 20 lb 21.85" 24" 45-235-194 Pan: 360° Rotation: 360° P/L 24" LCD Get the combination of value and versatility in this LCD desk mount solution. Extend and retract your LCD, tilt it up and down, and rotate the screen from landscape to portrait. Install the arm at any point on the vertical pole 9.5" variable height adjustment placing the screen at the right height for you. Features 3-point telescoping motion. Easily position your LCD for the ideal viewing angle and viewing distance. Compact design frees up desktop space. Extends LCD out up to 22" push your display out of the way when not in use. Easy installation and flexibility install either two or one of the extension arms or just the LCD pivot. Cable management feature routes cables under the arm, out of the way. Provides premium long-life LCD adjustment while maintaining touch-screen stability. Allows LCD to be rotated for portrait/landscape viewing. Ergotron Ergotron, Inc Flat Panel Display Neo-Flex Extend LCD Arm Silver www.ergotron.com

LCD Screen Flex Cable Ribbon for Motorola A1200 $7.99 Description:High quality replacement Motorola A1200 Flex Cable for your mobile phone!It's the connecting cable that link different parts in your device.If your screen changes to white or the devices turns off oftenly, it's properly the problem of the Motorola A1200 LCD Ribbon Cable.Replace your improper function or non function Motorola A1200 Ribbon Cable with the new one!It need professional skill to install, please be careful!Compatible with Motorola A1200.This is a non-OEM generic product.Accessory ONLY, phone not included.Size: perfect fitWeight: 1gInstallation instruction not included, please be sure you know how to install before bid.Package Contains:1 x Motorola A1200 LCD Flex Cable

LCD Flex Cable Ribbon with Connector for Samsung E258 $8.49 Description:Use this Samsung E258 Flex Cable to replace the faulty or damaged part.Quality material, premium craftsmanship.Replace the Samsung E258 Ribbon Cable may solve these problems of your phone, such as white LCD screen, screen appears reversed, color or image distorted and more.Custom design Samsung E258 Connector Ribbon fits your phone without modification.It is compatible with Samsung E258.This is non-OEM generic product.Accessory ONLY, phone not included.Weight: 2gWARNING: Professional installation skill is required. No instruction will be provided. Be sure you know how to install before bid.Package Included:1 x Samsung E258 LCD Flex Cable

Replacement LCD Flex Ribbon Cable for Samsung E950 $9.49 Description:Specially designed Samsung E950 Flex Cable is used to replace malfunction or damaged part.If your cell phone has white LCD screen, color or image distorted, or screen appears reversed malfunction, replace the Samsung E950 Ribbon Cable may solve these problems easily.Replace your improper function or non function Samsung E950 Ribbon with the new one!Great for repairing or fixing your cell phone.It is compatible with Samsung E950.This is non-OEM generic product.Accessory ONLY, phone not included.Weight: 2gWARNING: Installation instruction not included, please be sure you know how to install before bid.Package Included:1 x Samsung E950 LCD Flex Cable

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