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22 Cards in this Set
- Front
- Back
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oculomotor n.
innervation of what extrinsic muscles functional fiber types |
GSE for all below
superior, medial, inferior rectus m inferior oblique m Levator palpabrae superioris m. |
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where is oculomotor n. arising from brain?
size and description of n.? |
leaves anterior surface brainstem between midbrain and pons
small and round |
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oculomotor n.
innervation of what intrinsic eye muscles? fiber types? |
constrictor papillae m.
cilliary m. postganglionic PARAsympathetic Generaral visceral efferent (GVE) |
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other nerves acting on the eye?
where from? fiber type? |
NOTE: not from Oculomotor n. III
dilator pupillae m. Müller's m. (superior tarsal m.) - smooth m. Postganglionic SYMPAthetic visceral efferents enter orbit from the internal carotid plexus |
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what happens as cilliary m. contracts?
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lens thickens
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what topographical origin is the Olfactory n. (I)?
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telencephalon
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nerve functional type of Olfactory n. (I)?
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Special visceral afferent (SVA)
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Location of Olfactory n. (I)? Foramina it passes through?location of synapse?
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peripheral processes are in nasal mucosa
pass through cribiform foramina and gather superior to cribiform plate of ethmoid bone synapse w/ secondary neurons in olfactory bulb |
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Topographical origin of CN II optic n.?
nerve functional type |
Diencephalon
Special Somatic Afferent |
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what myelinates the optic tract?
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oligodendroglial cells
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if a tumor formed in the region of the infundibulum of the pituitary gland, what is a likely outcome?
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compression of optic chiasm
affect vision |
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what nerve innervates the medial rectus m. and the inferior oblique m.? what other muscles does this nerve innervate?
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occulomotor (CN III)
extrinsic eye m.: Superior rectus Lateral rectus Inferior rectus Levator palpabrae superioris (skeletal m.) (listed previously: medial rectus and inferior oblique) |
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occulomotor n. fiber type
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General Somatic efferent to extrinsic eye m.
GVE to intrinsic eye m.: constrictor pupillae m. ciliary m. |
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what type of fiber innervates the constrictor pupillae and ciliary m.?
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postganglionic parasympathetic
from the ciliary ganglion |
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what does the constrictor pupillae m. do?
ciliary m? |
1. constrict the pupil
2. accomodation of lens for near vision |
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what muscles are antagonistic to the postganglionic parasympathetics from occulomotor n.?
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dilator pupillae
müllers m. |
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what are the fiber types and where do they arise for the dilator pupillae and müllers m.?
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1. postganglionic sympathetic fibers
2. arise from internal carotid plexus, pass through orbit, then innervate each m. |
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what foramen does the oculomotor n. pass?
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superior orbital fissure
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what important blood vessels does oculomotor n. pass?
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superior cerebellar and posterior cerebellar a.
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where does trochlear n IV arise?
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dorsal apsect of mesencephalon (midbrain)
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what m. does trochlear n. innervate?
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Superior oblique (extraocular m.)
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what fiber types have the trigeminal n.? and to what m.?
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Afferent GSA to:
sensory to face 1/2 anterior scalp mucous memb. of oral and nasal sinus tympanic membrane eye & conjunctiva Dura mater (anterior cranial fossa) Efferent Branchial to: muscles of mastication tensor tympani tensor veli palatini anterior belly digastric m. mylohyoid m. |
