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32 Cards in this Set
- Front
- Back
What is the CN I Olfactory nerve, what is its sensory fucntion, and what are the conditions after being damaged?
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-conducts olfactory (smell) sensations to brain
-only type to regenerate -does olfaction (smell) -anosmia (partial or total loss of smell) occurs when damaged |
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What is the CN II nerve, what is its sensory function, and what are the conditions after being damaged?
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-special sensory nerve of vision that is an outgrowth of the brain (brain tract)
-vision -anopsia (visual defects) occurs when damaged |
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What is the CN III oculomotor nerve?
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-innerates upper eyelid and four of the six extrinsic eye muscles
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What are the somatic motor functions of the CN III oculomotor nerve?
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-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 |
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What are the parasympathetic motor functions of CN III oculomotor nerve?
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-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) |
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What are the conditions caused from being damaged?
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-Ptosis (upper eyelid droop)
-paralysis of eye muscles -strabismus (eyes not in parallel/ deviated improperly) -diplopia (double vision) -focusing difficulty |
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What is the CN IV trochlear nerve, what is its function, and what are the conditions when damaged?
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-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) |
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What is the CN V trigeminal nerve?
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-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 |
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What is the function of the ophthalmic?
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-conducts snesory impulses from cornea, nose, forehead, and anterior scalp
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What is the function of the maxillary?
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-conducts snesnory impulses from nasal mucosa, palate, gums, and cheek
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What is the function of the mandibular?
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-conducts sensory impulses from anterior two-thirds of tongue, skin of chin, lower jaw, lower teeth
-one thrid of sensations from auricle of ear |
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What is the somatic motor function of CN V trigeminal nerve?
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-innervates muscles of mastication (temporalis, masseter, lateral and medial pterygolds), mylohyroid, anterior belly of digatric, tensor tympani muscle, and tensor veli palatini
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What are the conditions when CN V trigeminal nerve is damaged?
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-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 |
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What is the CN VI abducens nerve , what is its function, and what conditions are caused due to damage?
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-innrevates lateral rectus muscle (abducts eye)
-abducts lateral rectus -paralysis of lateral rectus limits lateral movement of eye -diplopia (double vision) |
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What is the CN VII facial nerve?
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-innervates muscles of facial expression
-lacrimal (tear) gland, and most salivary glands -conducts taste sensations from the anterior two-thrids of the tongue |
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What is the sensory function of the CN VII cranial nerve?
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-taste from anterior two thrids of the tongue
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What is the somatic motor fucntion of the CN VII cranial nerves?
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-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.
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What is the parasympathetic motor function of CN VII facial nerve?
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-innervates (increases secretions of) the lacrimal gland of the eye and two salivary glands (submandibular and sublingual glands)
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What are the conditions caused from damage of the CN VII facial nerve?
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-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 |
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What is the CN VIII vestibulocochlear nerve, what is its function, and what is the conditons due to damage?
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-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) |
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What is the CN IX glassopharyngeal nerve?
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-recieves taste and touch sensations from posterior tongue sturctures
-innervates one pharnyx muscle and parotid salivary gland |
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What si the sensory function of CN IX glossopharyngeal nerve?
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-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) |
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What is the somatic motor function of the CN IX glossopharyngeal nerve?
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-innervates stylopharyngeus (pharnyx muscle)
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What is the parasympathetic motor function of the CNIX glossopharyngeal nerve?
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-innervates (thus increasing secretion of) parotid salivary gland
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What are the conditions caused by damage of the CN IX glossopharyngeal nerve?
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-reduced salivary secretion (dry mouth)
-loss of taste sensations to poasterior 1/3 of tongue |
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What is the CN X vagus nerve?
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-innervates structures in the head and neck and in the throacuc and abdominal caviities
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What are the snesory fucntions of CN X vagus nerve?
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-viseral sensory information from pahrnyx, larnyx, heart, lungs, and most abdominal organs.
-General snesory information from exteral auditory canal, eardrum, and pharnyx |
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What are the somatic motor functions of the CN vagus X nerve?
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-innervates most pharnyx muscles and larynx muscles
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What are the parasympathetic motor funtcions of CN X vagus nerve?
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-innervates visceral smooth muscle, cardiac muscle, and glands of heart, lungs, pahrnyx, larnyx, trachia, and most abdominal organs
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What are the conditions caused from damage to the CN X vagus nerve?
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-paralysis leads to hoarseness, monotone, or complete loss of voice
-may have difficulty in swalling or impaired gastrointestinal system mobility from lesions |
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What is the CN XI accessory nerve, it's functions, and conditions causes from damage?
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-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 |
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What is the CN XII hypoglosso nerve, its functions, and the conditions caused from damage?
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-innervates intrinsic and extrinsic tongue muscles
-"under the tongue" -inpaired tongue movement causes swallowing and speech difficluties -tongue deviates to side of damaged nerve |