Flashcards in H&N Deck (409)
What are the 4 branches of V2?
Infraorbital - skin of middle face, labial mucosa
Sup. alveolar: post.(molars, gingivae, sinus), mid.(premolars, cheek, gums), ant.(canine, incisor, lat. wall + floor of nose)
Describe the mandibular branch of trigeminal
Leaves through foramen ovale enter infratemporal fossa exits as mental nerve through mandibular foramen
What are the 5 branches of V3?
Always Believe Lots (Info Actually) Matters
1. Auriculotemporal: sensory to auricle temporal regions (EAM, IJV, scalp), secretomotor to parotid gland
3. Lingual: floor of mouth, ant. 2/3 of tongue
4. Inf. alveolar: mandible
5. Masticatory muscles
What is trigeminal neuralgia?
Uncommon cranial nerve disorder resulting in abrupt, excruciating pain in face
What are some therapies of trigeminal neuralgia?
Meditative: antiseizure, muscle relaxant
Conservative: nerve block
Surgery: microvascular decompression, radiofrequency rhizotomy, gamma-knife radio surgery, glycerol rhizotomy
Describe the abducens nerve
From hind brain b/w pons and medulla, exits through cavernous sinus to sup. orbital fissure to supply lateral rectus muscle
What is the effect of damage to the abducens and how can this be tested?
Inability to rotate eye laterally, at rest eye moves medially
Test: lateral movement of eye
What 3 nerves supply the eye?
LR6 SO4 3
3. Oculomotor: eyelid and pupillary constriction
4. Trochlear: sup. oblique muscle; inferolateral eye movement
6. Abducens: lateral rectus muscle; lateral eye movement
Describe the facial nerve
Runs from bind brain through IAM forming geniculate nucleus, runs further, emerges through stylomastoid foramen but before gives off stapedius nerve, greater petrosal, chorda tympani before running to parotid gland
What is the function of the facial nerve?
Facial expression - motor
Sense of taste - sensory
What is the effect of damage to the facial nerve and how can it be tested?
Inability to control facial muscles, distorted sense of taste, dry eyes
Test: motor functions (close eyes, raise brows, smile, whistle); taste
What are the 5 branches of the facial nerve outside the facial canal?
Two Zebras Behind My Car
4. Mandibular - lower lip and chin
What are the 3 branches of the facial nerve inside the facial canal?
Come Great Steed
1. Chorda tympani: joins lingual of mandibular, ant. 2/3 tongue
2. Greater petrosal: lacrimal, ant. palate
3. Stapedius: to stapedius muscle
Describe the glossopharyngeal
From medulla exits through jugular foramen
Motor innervates stylopharyngeus muscle
Sensory to oropharynx and post. tongue
Describe the vestibulocochlear
From hind brain exits through IAM gives off
Vestibular: balance; connects to semicircular canals, position relative to space
Cochlear: sound; vibrations from hairs
What is the function of the vestibulocochlear and what are the effects and tests for damage?
Function: balance and equilibrium
Damage: deafness, dizziness, nausea, loss of balance
Test: hearing, balance, walk in straight line
What are the functions of the glossopharyngeal?
Swallowing, salivation, gagging (motor); touch, pressure, taste, pain of tongue, pharynx, outer ear
What is the effect of damage to the glossopharyngeal and how is this tested?
Test: gag reflex, swallowing, coughing
Describe the vagus nerve
From medulla exits through jugular foramen
What do the sensory fibres of the vagus supply?
EAM and tympanic membrane
What does the motor fibres of vagus supply?
Muscles of larynx, respiratory passages, lungs, heart, oesophagus, stomach, SI, most of large intestine and gallbladder
What is the function of the vagus nerve?
Swallowing; taste; speech; respiratory, CV, GI regulation
Sensations of hunger, fullness, intestinal discomfort
What are the effects of damage to the vagus?
Hoarseness/loss of voice, impaired swallowing and GI motility
Describe the accessory nerve?
From medulla and spinal cord emerge through jugular foramen
What does the accessory nerve supply?
Trapezius (neck upright) and sternocleidomastoid (lat. move. of neck) muscles
What are the general functions of the accessory nerve?
H&N, shoulder movement
What are the effects of damage to accessory nerve and how to test for this?
Impaired movement of H&N + shoulders; paralysis of sternocleidomastoid
Test: rotate head, shrug shoulders against resistance
What is the function of the hypoglossal?
Innervates tongue muscles: movements of speech, swallowing, food manipulation
Describe the hypoglossal
From medulla, exits through hypoglossal canal