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Definition
| also "neuroglia"; non-neuronal supporting cells of the brain and spinal cord; have 4 main functions |
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Definition
| thickened area of embryonic ectoderm induced by the notochord to form; --->neural tube and neural crest |
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| structure that goes on to form the brain and spinal cord in the developing embryo |
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| zone during neurulation that gives rise to neural crest cells--->forms PNS, ANS, other structures |
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| formation of the neural tube at 4th week |
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| rostral opening at end of closing neural tube, closes at about day 25 |
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| caudal opening at end of closing neural tube; closes at about day 28 (hopefully) |
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| small opening through neural tube, created by decrease in tube's lumen due to thickening lateral walls |
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Definition
| wall of neural tube; pseudostratified, columnar neuroepithelium; gives rise to all neurons and magroglial cells |
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| develops on outer part of ventricular zone; becomes white matter of spinal cord as axons grow into it |
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Definition
| primordial supporting cell of the CNS; differentiate from neuroepithelial cells after neuroblasts; migrate; ---> astroblasts and oligodendroblasts |
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| formerly neuroepithelial cells; line central canal; produces CSF |
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Definition
| derived from mesenchymal cells; phagocytic |
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| longitudinal groove on each side of developing spinal cord; develops due to differential thickening of walls; separates alar plate and basal plate |
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Definition
| dorsal part of spinal cord; later assoc. w/ afferent functions |
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Definition
| ventral part of spinal cord; later assoc. w/ efferent functions |
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| cell bodies (afferent nuclei) that form the dorsal columns of spinal cord |
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Definition
| forms as alar plates enlarge; appear as a medial line on the dorsal side of transverse sections of spinal cord |
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Definition
| transverse view of cell bodies making up ventral column of spinal cord |
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| ventral roots of the spinal nerves |
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Definition
| formed from axons the extend out of ventral horn |
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Definition
| gap between ventral horns formed by bulging on either side, continuous w/ ventral median septum |
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Definition
| derived from neural crest cells; 2 long processes (1 dendritic) that extend from group of cell bodies (ganglion) to the spinal cord (axon, dorsal roots of the spinal nerves) or to sensory endings in the body |
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| dorsal roots of the spinal nerves |
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Definition
| bundle of processes of spinal ganglia cells that enter the spinal cord |
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Definition
| external layer of meninges or membrane around spinal cord; forms from surrounding mesenchymal cells |
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Definition
| pia mater + arachnoid mater + neural crest cells |
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Definition
| middle layer of meninges or membrane surrounding spinal cord |
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Definition
| inner layer of meninges or membrane surrounding spinal cord |
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| space that develops between pia mate and arachnoid mater; contains CSF |
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| delicate strands of connective tissue between pia and arachnoid; remnant of their connection |
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| also "medullary cone"; end of the spinal cord |
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Definition
| sheaf of nerve roots extending inferiorially from conus medullaris |
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Definition
| fibrous thread of pia mater distal to conus medullaris; attaches to periosteum of coccygeal vert. 1 |
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