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32 Cards in this Set

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  • Back
What is the CN I Olfactory nerve, what is its sensory fucntion, and what are the conditions after being damaged?
-conducts olfactory (smell) sensations to brain
-only type to regenerate
-does olfaction (smell)
-anosmia (partial or total loss of smell) occurs when damaged
What is the CN II nerve, what is its sensory function, and what are the conditions after being damaged?
-special sensory nerve of vision that is an outgrowth of the brain (brain tract)
-vision
-anopsia (visual defects) occurs when damaged
What is the CN III oculomotor nerve?
-innerates upper eyelid and four of the six extrinsic eye muscles
What are the somatic motor functions of the CN III oculomotor nerve?
-supplies four extrinsic eye muscles (superior rectus, inferior rectus, medial rectus, and inferior oblique) that move eyeball
-supplies levator palpebrae superoris muscle to elevate eyelid
What are the parasympathetic motor functions of CN III oculomotor nerve?
-innervates sphincter pupillae muscle of iris to make pupil contract
-contracts cilary muscles to make the lens of eye more speherical (as needed for near vision)
What are the conditions caused from being damaged?
-Ptosis (upper eyelid droop)
-paralysis of eye muscles
-strabismus (eyes not in parallel/ deviated improperly)
-diplopia (double vision)
-focusing difficulty
What is the CN IV trochlear nerve, what is its function, and what are the conditions when damaged?
-innervates one extrinsic muscle (superior oblique) that lopps through a pully-shaped ligament
-supplies one extrinsis eye muscle (superior oblique) to move eyeball inferiorly and laterally
-paralysis of superior oblique
-strabismus (eyes not in parallel/deviated improperly)
-diplopia (double vision)
What is the CN V trigeminal nerve?
-consists of three divisions
-ophthalmic, maxillary, and mandibular
-receives sensory impulses from face, oral cavity, nasal cavity, and anterior scalp, and innervates muscles of mastication
What is the function of the ophthalmic?
-conducts snesory impulses from cornea, nose, forehead, and anterior scalp
What is the function of the maxillary?
-conducts snesnory impulses from nasal mucosa, palate, gums, and cheek
What is the function of the mandibular?
-conducts sensory impulses from anterior two-thirds of tongue, skin of chin, lower jaw, lower teeth
-one thrid of sensations from auricle of ear
What is the somatic motor function of CN V trigeminal nerve?
-innervates muscles of mastication (temporalis, masseter, lateral and medial pterygolds), mylohyroid, anterior belly of digatric, tensor tympani muscle, and tensor veli palatini
What are the conditions when CN V trigeminal nerve is damaged?
-trigeminal neuralgia (tic douloureus)
-caused by inflammation of the sensory components of the trigeminal nerve
-results in intense, pulsating pain lastign form minutes to several hours
What is the CN VI abducens nerve , what is its function, and what conditions are caused due to damage?
-innrevates lateral rectus muscle (abducts eye)
-abducts lateral rectus
-paralysis of lateral rectus limits lateral movement of eye
-diplopia (double vision)
What is the CN VII facial nerve?
-innervates muscles of facial expression
-lacrimal (tear) gland, and most salivary glands
-conducts taste sensations from the anterior two-thrids of the tongue
What is the sensory function of the CN VII cranial nerve?
-taste from anterior two thrids of the tongue
What is the somatic motor fucntion of the CN VII cranial nerves?
-the five motor branches (temporal, zygomatic, buccal, mandibular, and cervical) innervate the muscles of facial expressio, the posterior belly of the digastric muscle, and the stylohyoid and stapedius muscles.
What is the parasympathetic motor function of CN VII facial nerve?
-innervates (increases secretions of) the lacrimal gland of the eye and two salivary glands (submandibular and sublingual glands)
What are the conditions caused from damage of the CN VII facial nerve?
-decreased tearing (dry eye)
-decreased salivation (dry mouth)
-loss of taste sensation to anterior two-thirds of tongue
- facial palsy characterized vy paralyzed facial muscles, eyelid droop, and sagging at corner of mouth
What is the CN VIII vestibulocochlear nerve, what is its function, and what is the conditons due to damage?
-conducts equilibrium and auditory sensations to brain
-cochlear branch conducts impulses for hearing
-vestibular branch conducts impulses for equilibrium
-lesions in vestibular branch produce loss of balance nausea, vomiting, and dizziness
-lesions in cochlear branch result in deafness (loss of hearing)
What is the CN IX glassopharyngeal nerve?
-recieves taste and touch sensations from posterior tongue sturctures
-innervates one pharnyx muscle and parotid salivary gland
What si the sensory function of CN IX glossopharyngeal nerve?
-general sensation and taste to the posterior 1/3 of tongue
-chemoreceptors fibers to the carotid bodies (structures on the carotid arteries that detect and monitor O2 and CO2 levels in the blood)
What is the somatic motor function of the CN IX glossopharyngeal nerve?
-innervates stylopharyngeus (pharnyx muscle)
What is the parasympathetic motor function of the CNIX glossopharyngeal nerve?
-innervates (thus increasing secretion of) parotid salivary gland
What are the conditions caused by damage of the CN IX glossopharyngeal nerve?
-reduced salivary secretion (dry mouth)
-loss of taste sensations to poasterior 1/3 of tongue
What is the CN X vagus nerve?
-innervates structures in the head and neck and in the throacuc and abdominal caviities
What are the snesory fucntions of CN X vagus nerve?
-viseral sensory information from pahrnyx, larnyx, heart, lungs, and most abdominal organs.
-General snesory information from exteral auditory canal, eardrum, and pharnyx
What are the somatic motor functions of the CN vagus X nerve?
-innervates most pharnyx muscles and larynx muscles
What are the parasympathetic motor funtcions of CN X vagus nerve?
-innervates visceral smooth muscle, cardiac muscle, and glands of heart, lungs, pahrnyx, larnyx, trachia, and most abdominal organs
What are the conditions caused from damage to the CN X vagus nerve?
-paralysis leads to hoarseness, monotone, or complete loss of voice
-may have difficulty in swalling or impaired gastrointestinal system mobility from lesions
What is the CN XI accessory nerve, it's functions, and conditions causes from damage?
-innervates trapezius, sternocleidomastoid, and some pharnyx muscles
-cranial root carries impulses with vagus nerve fibers to pharnyx
-spinal root innervates trapezius and sternocleidomastoid
-paralysis results in difficulty in elevating shoulder or tunring head side to side
What is the CN XII hypoglosso nerve, its functions, and the conditions caused from damage?
-innervates intrinsic and extrinsic tongue muscles
-"under the tongue"
-inpaired tongue movement causes swallowing and speech difficluties
-tongue deviates to side of damaged nerve