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23 Cards in this Set
- Front
- Back
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When does neurulation begin?
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Day 18/19 (Near end of wk 3)
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-What is the neural plate derived from
-What influences this |
-neuroectoderm
-notochord |
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Name the neuropores and the days they close
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Cranial - 24
Caudal - 26 |
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What is the neural crest
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Neuroectodermal cells which separate from the neural tube
FORMS PNS and other non-neural structures |
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What does the neural canal form
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Ventricles of the brain
Central canal of the spinal cord |
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Alar plates: location
sensory or motor? |
Dorsal Location
Sensory neurons; primarily of the dorsal horn |
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Basal plates
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Ventral location
Form motor neurons of ventral and lateral horns |
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Sulcus limitans
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Longitudinal groove along the length of the lumen of the neural tube
Marks the division between alar and basal plates |
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What does the ventricular layer of the neural tube become
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Neurons and glial cells
Ependyma |
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Intermediate layer of neural tube
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gray matter of spinal cord: dorsal, lateral, ventral horns)
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Marginal layer of the neural tube
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White matter of the spinal cord
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Dorsal root ganglion
- Derived from - What type of neurons |
Neural crest!
Primary sensory neurons |
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What is significant about floor plate in adult
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Where many axons cross midline of spinal cord
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Are there synapses in sensory ganglia?
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NO!!!!!
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Myelinating cells in PNS
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Schwann cells
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Myelinating cells in the CNS
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Oligodendrocytes
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When does myelination begin and finish
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During 4th month of development through the first year of postnatal life
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What is the length of the spinal cord at birth?
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L2/L3
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What is the length of the spinal cord in the adult
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L1/L2
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The optic nerve and retina are formed from an outgrowth of what secondary brain structure
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Diencephalon
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Where does the pituitary (hypophysis) originate from?
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Neuroectoderm and oral ectoderm
Infindibulum: from diencephalon (neuroectoderm) Rathke's pouch (from oral ectoderm) |
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The olfactory tract forms as an outgrowth of what 2ndary brain structure
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Telencephalon
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What produces CSF
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Choroid plexus!!!!!
Forms in all ventricles |
