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35 Cards in this Set
- Front
- Back
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Spinal Cord (organization)
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Gray matter - on inside
White matter on outside |
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Gray matter
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- collections of neuron cell bodies and unmyelinated axons. nuclei acts as relaying station
or has integrative functions (combines signals) |
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White matter
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parallel axons and myelin sheaths are white matter, form nerve tracts which transmit action potentials from one area to another
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Organization
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Somatic Sensory - dorsal furthest out
Visceral sensory - dorsal close to center Visceral motor - ventral close to center somatic motor - ventral away from center |
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Development (neural tube)
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Develops on dorsal midline of embryonic disk is epithelial cells tightly adhering to one another derives brain and spinal cord
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Neural Crest
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Lateral to neural tube made of mesencyme free
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Mantle layer
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layer of cells surround original epithelial cells during development gives rise to gray matter
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Marginal layer
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division continues and another layer surrounds mantle layer gives rise to white matter in marginal layer fibers beomce milenated
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Regions of mantle layer
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Roof plate
Floor plate sulcus limitans alar plates basal plates |
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Roof plate
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Thin layer at dorsal side
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floor plate
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layer on ventral side, forms motor neurons, axons exit spinal cord from ventral root, cell bodies form motor units located n CNS axons in PNS
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sulcus limitans
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thin area on side
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alar plates
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two expanded areas on dorsal side
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basal plates
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ventral expansion gives rise to ventral honrs
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Neuroglia cells
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formed by neuroepithelial cells after they have givin rise to neurons
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Neural Crest
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Creates sensory neurons
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Central process
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grows into dorsal horn of CNS
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Periferal procces
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grows inot opposite side
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Brain development
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posterior region of neuraltube creats spin cord
anterior region creates brain |
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first 3 brain divisions
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Prosencephalon - forebrain front
Mesencephalon - midbrain Rhombencephalon -hindbrain |
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5 divisions
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prosencephalon becomes telencephalon and diencephalon
then mesencephalon rhombencephalon divids into metencephalon then myelencephalon |
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Central canals or ventricles
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lateral vent - located in telencephalon
third vent - located in diencephalon aqueduct of silvius - mesencephalon fourth vent - rhombencephalon |
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Choroid plexus
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formed from roof plate - secrets fluid that fills central canal known as cerebral spinal fluid
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Medulla oblongata
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in milencphalon
Functions: somatic sensory visceral sensory visceral motor somatic motor |
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Medulla oblongata (somatic sensory)
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recieves sensations from head and face (touch)
first association center for hearing and balance. |
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Association Center
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Where synapses occur and information can be changed there
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Medulla oblongata (Visceral Sensory)
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recieeves general sensations of throat and mouth.
also acts as first association center for taste |
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visceral motor
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innervates branchial muscles and smooth muscles going into guts
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Somatic motor
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innervates muscles of tongue
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Pyrimids of medulla
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neural pathways coming from primary motor in the cortext on side ar inferior allas which are relay nuclei for spinal cerebrial tract where synapsing occures
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Metencephalon
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Contains pons
cerebellum |
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Pons
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primarily a relay station for motor inofrmation going from cerebral cortext to cerebellum to coordinate a motor function
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cerebellum
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sensory imputs
balance proprioreception primary motor area of cerebrum |
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Cerebellum internal organization
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white layer arbor vitae - nerve fibers , axons
outer gray layer - cereballar cortex - cell bodiies |
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peduncles
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tracts that go in and out nerve tracts
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