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12 Cards in this Set
- Front
- Back
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Sensory Neurons
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- at spinal cord: all sensory neurons are from neural crest
- in head: sensory neurons also from ectodermal neurogenic placodes * olfactory placodes (SVA) * epibrachial placodes ( SVA) * otic placodes (SSA) |
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skeletal muscle
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- at SC skeletal (striated muscle is from somites (myotmes) innervated by GSE
- in head, skeletal muscle is also from brachiomeres ( paraxial mesoderm that populates branchial arches) innervated by SVE or BE |
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Neural crest
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- from bone and connective tissue
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GVA
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- visceral sensation receptors in endoderm derived structures
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GSA
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- (pain, temp, pressure) receptors in ectoderm derived tissue
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GVE
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- smooth muscle, blood vessels, glands
- 2 neuron system |
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GSE
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- innervates striated muscle from myotome of somite
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In head nerves
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- in head skeletal muscles is also from brachiomeres
- paraxial mesoderm that populates the branchial arches (innervated by SVE * special to head * visceral because the branchial arches also called visceral arches - SVE voluntary - SVE also known as BE (Branchial efferents) |
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Hos SVE different from GSE
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- differ in location of nuclei in brain
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Each arch has...
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1. Cartilaginous component: from neural crest
2. muscular component: branchiomeric muscle: striated: innervated by SVE (BE) 3. artery- aortic arch 4. cranial nerve- associated with each (V, VII, IX, X) |
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After Birth
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- larynx and epiglottis grow away from soft palate so that simultaneous nursing and breathing no longer possible
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Tongue
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- note that floor of pharynx contributed by 2nd arch overgrown by 3rd arch
- so posterior 1/3 of the tongue is innervated by 3rd arch nerve (glossopharyngeal) - there is no sensory nnervation of mucosa b facial nerve (except for taste) |
