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22 Cards in this Set
- Front
- Back
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ectoderm
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give rise to neural and skin tissue
signaled by mesoderm |
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mesoderm
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signals ectoderm
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sonic hedgehog
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protein
mesodermal tissue under spinal cord near - become glial cells farther - motor neurons farthest - interneurons |
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neurotransmitter fate
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motor neuron - fixed
some alone - norepinephrine w/ cardiac - acetylcholine |
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ventricular zone
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neuron starting point
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marginal zone
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border of neuron journey
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intermediate zone
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fills up after neurons stop dividing
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glial fibers
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paths for neurons to migrate
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growth cones
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direct axon growth
search out certain chemicals, avoid others |
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signaling molecule families (3)
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proteins
netrin semaphorin (15) ephrin (10) |
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netrin
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signaling molecule
found in worm nerve ring |
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target recognition
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axons choose proper neuron
mediated by molecules |
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peripheral nervous system & regions?
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signals to and from central nervous system
cervical, thoracic, lumbar, sacral regions |
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cervical region
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serve neck and arms
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thoracic region
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serve trunk
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lumbar region
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serve legs
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sacral region
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serve bowels and bladder
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paring back
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get rid of unneeded neurons
prunes system to efficiency |
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apoptosis
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programmed cell death
turns on if lacking trophic factors |
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critical periods
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systems need certain experiences to develop right
"use it or lose it" |
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epilepsy and kids
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higher brain activity, appear in children and fade away as adult
critical periods have high activity |
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myelination
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myelin wrapping around axons
frontal lobes done last |
