Comparative Test 3 ( Cranial Nerves )

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  1. Terminal
    • 0
    • General somatic sensory from nasal mucosa
    • Lacking in Agnathans, constant in everyone else
  2. Olfactory
    • 1
    • Special somatic sensory from nasal sac
    • cell bodies located in nasal epithelium in vertebrates with vomeronasal organs, olfactory branches to form vomeronasal nerves.
  3. Optic
    • 2
    • Technically a brain tract rather than a nerve.
    • special somatic sensory from retina to optic lobes.
    • below mammals, much decussation (the crossing of the midline of the brain or spinal cord by neuron tracts)
    • in mammals, not all fibers decussate
  4. Oculomotor
    • 3
    • general visceral motor (ciliary branch of oculomotor), somatic motor, proprioceptive somatic sensory (may travel in trigeminal)
    • travels to and from extrinsic eye muscles (those that move the eyeball) that develop from the first somite ( dorsal rectus, medial rectus, ventral rectus, ventral oblique)
  5. Trochlear
    • 4
    • Innervates extrinsic muscles of eye that develop from the second somite ( which is only one, the dorsal ( = superior) oblique)
    • somatic motor function
  6. Trigeminal
    • 5
    • named because it is 3-branched
    • Mandibular Branch - special visceral motor to first branchial arch derivatives
    • Ophthalmic and infraorbital branches - general somatic sensory from face
  7. Abducens
    • 6
    • last ocular muscle arises from 3rd somite, abducens is somatic motor to it.
    • has some proprioceptive fibers in lower vertebrates
  8. Facial
    • 7
    • special visceral motor to hyoid muscles of second visceral arch.
    • becomes a motor nerve to facial muscles of mammals.
    • general and special visceral sensory from oral cavity and pharynx.
    • special somatic sensory from surface of the body.
  9. Auditory
    • 8
    • a general term, called statoacoustic in fishes and vestibulocochlea in mammals.
    • special somatic sensory neurons from the ear.
  10. Glossopharyngeal
    • 9
    • special visceral motor to muscles of third branchial arch.
    • contains general and special visceral sensory nerves from the first gill pouch and back of pharynx.
    • in fishes may return fibers from part of the lateral line.
  11. Vagus (Wandering)
    • 10
    • special visceral motor to muscles of branchial arches 4-7; general special sensory from pharynx and gill pouches.
    • accessory branch - special visceral motor to cucullaris muscle of pectoral girdle in fishes.
    • intestinal branch - general visceral motor and sensory to and from abdominal viscera.
  12. Spinal Accessory
    • 11
    • special visceral motor to derivatives of the cucullaris (Muscles of the shoulders)
  13. Hypoglossal
    • 12
    • somatic motor to the base of the tongue, innervates tounge muscles.
    • occipital nerves - homolog of the hypoglossal in syclostomes and fishes ( in which it is called the hypobranchial)
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Comparative Test 3 ( Cranial Nerves )
2011-10-30 18:07:13
Comparative anatomy

Comparative anatomy lecture test number three.
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