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7-9 cranial nn.
| Question | Answer |
|---|---|
| What nerve fibers of the PNS carry impulses towards the CNS? | Affferent (sensory) |
| What nerve fibers of the PNS carry impulses from the CNS to the muscles? | Efferent (motor) |
| What are the two divisions of the ANS? | Sympathetic and parasympathetic |
| Are cranial nerves part of the PNS or ANS? | PNS |
| What does the somatic nervous system deal with? | Body, skeletal muscles, sensations, etc |
| What does the autonomic nervous system deal with? | Organs (viscera), INVOLUNTARY |
| Cranial nerve components- motor | Fibers to: voluntary skeletal muscle, involuntary cardiac/smooth muscles or glands, voluntary skeletal muscles during development |
| Cranial nerve components- sensory | General sensation, sensations from the viscera, unique/special sensations |
| How are the cranial nerves named? | Anterior to posterior; 1-12 |
| What does the pituitary gland sit on? | Hypophysial plate |
| What are the names of the cranial fossas? | Anterior, middle, posterior |
| What does the abducens nerve sit on? | Clivus |
| Olfactory nerve | CN I; sensory; cribiform plate of ethmoid; smell and taste |
| Optic nerve | CN II; sensory; optic canal of sphenoid; vision |
| Where is the optic chiasm located? | Superior to pituitary gland |
| Oculomotor nerve | CN III; motor; superior orbital fissure of sphenoid; motor to majority of eye muscles |
| Trochlear nerve | CN IV; motor; superior orbital fissure of sphenoid; motor to superior oblique muscle |
| What nerve comes off the opposite side of the brain stem? | Trochlear nerve |
| Trigeminal nerve | CN V; motor and sensory; superior orbital fissure, foramen rotundum, foramen ovale; motor to the muscles of mastication and sensation to face |
| What nerve do dentists usually block? | Trigeminal nerve |
| What are clinical correlates for trigeminal nerve? | Tic douloureux, loss of corneal reflex, dental anesthesia |
| Abducens nerve | CN VI; motor; superior orbital fissure of the sphenoid; motor to lateral rectus muscle, abduction of eye |
| Facial nerve | CN VII; motor and sensory; internal acoustic meatus and stylomastoid foramen; motor to the muscles of facial expression and branchial motor, parasympathetic innervation to a few salivary glands; sensation, taste from the anterior 2/3 of tongue |
| What nerve is responsible for taste for the anterior 2/3 of the tongue? | Chorda tympani nerve |
| Vestibulocochlear nerve | CN VIII; sensory; internal acoustic meatus; balance and hearing |
| Clinical correlates of vestibulocochlear nerve | Vertigo, deafness, conductive & sensorineural |
| Glossopharyngeal nerve | CN IX; Motor and sensory (throat); jugular foramen; motor to stylopharyngeus muscle, innervation carotid sinus and body and parotid gland; sensation of the pharynx, sensation of taste from the posterior 1/3 of tongue; GAG reflex |
| Vagus nerve | CN X; Motor and sensory (pharynx and rest of body); jugular foramen; sensation of the pharnyx, taste near epiglottis, vocal cords; parasympathetic innervation and sensation of/from organs, branchial motor to the palate/pharynx |
| Clinical correlates of vagus nerve | Dysphonia, dysphagia, aphonia, respiratory stridor |
| If a patient can't shrug their shoulders and swallow, what nerves are damaged? | CN IX-XI, jugular foramen |
| Spinal accessory nerve | CN XI; Motor (neck); jugular foramen and foramen magnum; motor to the SCM and trap |
| Hypoglossal nerve | CN XII; motor (tongue); hypoglossal canal; motor to the muscles of the tongue |
| Clinical correlates of hypoglossal nerve | Ipsilateral tongue paralysis and atrophy |
Created by:
beranml
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