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25 Cards in this Set

  • Front
  • Back
Name the cranial nerves.
OOOTTAFVGVAH
SSMMBMBSBBMM
Where are the cell bodies of the optic nerve?
retina of eyeball
Where do the optic nerve's axons cross rostral to the hypothalamus?
At optic chiasma
What is the function of the parasympathetic fibers of the oculomotor nerve?
Motor involuntary/smooth mm. of eye (near focus lens & constrict pupil)
What cranial nerve innervates the majority of the skin of the head?
Trigeminal nerve
What are the branches of the trigeminal nerve?
What do they innervate?
3, Ophthalmic (5i- sensory from forehead)
maxillary (5ii-sensory from middle face)
mandibular (5iii-sensory from lower face & motor to muscles of mastification)
What innervates most of the muscles of mastification?
Mandibular division of CrN5
What type of nerves are in the divisions of CrN 5?
All sensory, mandibular also motor to muscles of mastication
What are the most important functions of the facial nerve clinically?
Motor to obicularis oculi m. & lacrimal gland (dry eye)
What clinically significant structure does the parasympathetic ANS fibers of the facial nerve innervate?
Lacrimal gland
What does the auriculopalpebral nerve (br. of CrN7) innervate?
eyelids & ear mm.
With what does the vestibular branch of the vestibulocochlear nerve deal ?
equilibrium/motion
What is the recurrent laryngeal nerve?
branch of vagus, arises in thorax & extends back to larynx to end in ca.laryngeal n.
What does the recurrent laryngeal nerve innervate?
Motor to skeletal mm. of larynx, including cricoarytenoideus dorsalis m. & part of esophagus & trachea
What type of nerve is the hypoglossal (CrN 12)?
What does it innervate?
motor nerve (somatic)
tongue mm.
How so all 12 cranial nerves leave the cranial cavity?
through foramina of skull
Most of the cranial nerves are mixed nerves, what does this mean?
They carry both sensory & motor fibers
Sensory cranial nerves send only ______ impulses to the brain.
sensory
What fibers innervate glands & smooth & cardiac muscles?
Autonomic fibers (ANS)
What 3 cranial nerves are completely sensory, bringing impulses of special senses to the brain? What are those senses?
Olfactory (1) smell, Optic (2): sight, Vestibulocochlear (8): hearing/balance
What are the most clinically important ANS fibers in the head?
CrN7 to lacrimal gland & sympathetic to eye (Horner's syndrome)
Outline the pathway of the sympathetic innervation to the head.
Nerves from hypothalamus (UMN) down cervical cord to lateral (intermediolateral) gray column to thoracic segments 1-4, preganglionic fibers over communicating branches & up sympathetic trunk to cranial cervical ganglion; Postganglionic fibers through middle ear, cranial cavity & orbit over CrNs
Through what head structures do sympathetic fibers to the eye pass?
Middle ear, cranial cavity & orbit
What does stimulation of sympathetic fibers of the eye cause?
dilation of pupil, widening of palpebral fissure, protrusion of eyeball
Where is the vagosympathetic trunk in the neck?
In carotid sheath w/ common carotid a.