CN 7-12 Flashcards
Where do all general somatic sensory fibers synapse?
Trigeminal complex
Where are preganglionic parasympathetic fibers?
Facial, glossopharyngeal, and vagus nerve
Where are preganglionic parasympathetic somata found?
pontine and medullary nuclei
What does CN 7 innervate?
Superficial mimetic facial muscles
Path of somatic motor neurons of the facial nerve
Leave pons in facial nerve thru temporal bone and middle ear cavity, exits via stylomandibular foramen, enters the parotid gland and divides into 5 branches
Muscles innervated by somatic motor neurons of facial nerve
Stapedius, stylohyoid, posterio belly of digastric, mimetic muscles
Greater Petrosal nerve path
From facial nerve at geniculate ganglion, pass anteriorly across the middle cranial fossa, enter pterygopalatine fossa, synapse in pterygopalatine ganglion
Parasympathetic greater petrosal nerve of the facial nerve innervate what?
Post-pterygopalatine ganglion fibers control secretion of the lacrimal gland/mucous glands of nasal cavity
Chorda tympani nerve path
Leaves middle ear cavity and joins lingual nerve in the infratemporal fossa, synapse with submandibular ganglion
Parasympathetic chorda tympani innervates what?
Postganglion control secretion from submandibular and sublingual salivary glands
Visceral sensation of taste to anterior 2/3rds of tongue is supplied by what?
Facial via ganglia in temporal bone. Fibers join chorda tympani in middle ear cavity, pass inferiorly into the infratemporal fossa to join the lingual nerve
Sensory to external auditory canal and ear and small area to oropharynx pathway
Sensory cell bodies are in geniculate ganglion
Cranial nerve 8
Vestibulocochlear nerve
Cranial nerve 9
Glossopharyngeal nerve
Somatic motor neurons in CN9
innervate stylopharyngeus
Parasympathetic of CN9
Diverge from CN9 at base of skull, enter/pass thru middle ear cavity, exit middle ear cavity as lesser petrosal nerve, synapse on otic ganglion (deep in infratemporal fossa). Postgang. Join auriculotemporal and innervate parotid
Somatic sensation of CN9
Supplies limited somatic sensation to posterior tongue/oropharyns/middle ear cavity
Taste sensation of CN9
Posterior 1/3 of tongue. Sensory cell bodies are in inferior ganglion near base of skull. Peripheral processes pass to posterior tongue, central processes synapse on rostral half of solitary nucleus
General viseral sensory info of CN9
O2 levels and BP from carotid artery. Sensory bodies are inferior ganglion of 9, peripheral fibers distribute to/synapse on receptors in carotic body/siphon. Central processes synapse on the caudal half of the solitary nucleus
Cranial nerve 10
Vagus nerve
Somatic motor neurons of CN10
Nucleus ambiguus, axons innervate most of pharynx and larynx
Parasympathetic innervation of CN10
Pregang cell bodies are in dorsal motor nucleus of 10 in medulla, pregang fibers pass in vagus nerve t o thorax and abdomen and synapse close to target organ
General viseral afferents of CN10
Info/function status of thoracic/abdominal organs. Sensory cell bodies are in inferior ganglion of 10, peripheral processes distribute with vagus nerve, central process synapse on cells in caudal solitary nucleus
General taste and sensation of CN10
Posterior tongue/adjacent pharyngeal wall. Sensory cell bodies are superior/inferior vagal ganglia, central processes synapse on cells in the trigeminal spinal nucelus/solitary nucleus
Symptoms of vagus nerve damage
Low/soft voice, aspirate fluids/food more easily, asymmetrical soft palate
Cranial nerve 11
Accessory nerve
Muscles innervated by CN11
Trapezius and sternocleidomastoid
Path out of the skull of CN11
Lateral surface of cervical cord, pass thru f. magnum into skull, leaves via jugular foramen
Cranial nerve 12
Hypoglossal nerve
Path of CN12
Exit thru hypoglossal canal, pass anteriorly to enter deep floor of mouth
Innervation of CN12
Intrinsic/extrinsic muscles of the tongue except palatoglossus
