Cranial nerves 3 Flashcards
(61 cards)
what is nervus intermedius
part of the facial nerve that contains sensory and parasympathetic fibres
what nerve supplies sensation to the cavities of the head
trigeminal (somatic afferent)
what are the muscles of mastication derived from
1st pharyngeal arch (so special visceral efferent)
what is the function of the trigeminal motor nucleus
muscles of mastication
function of the trigeminal mesencephalic nucleus
proprioception
trigeminal principle sensory nucleus
discriminative touch
trigeminal spinal nucleus
pain and temp for structures supplied by cn5 plus general sensation for viscera supplied by 9 and 10
where do the nerve roots of cn5 emerge
from the mid pons
pass forward onto the apex of the petrous temporal bone where the trigeminal ganglion lies in a cave of dura mater (meckel’s cave)
what is the other name for the trigeminal cave
Meckel’s cave
describe the pathway of the opthalmic and maxillary divisions
divisions pass anteriorly in the lateral wall of the cavernous sinus to reach the superior orbital fissure then the orbit, and foramen rotundum then the pterygo-palatine fossa respectively
where does the opthalmic division exit the skull
superior orbital fissure
where does the maxillary division exit the skull
foramen rotundum and pterygo palatine fossa
where does the mandibular division exit the skull
foramen ovale and into the infratemporal fossa
what muscles does the facial nerve supply (special visceral efferent)
facial expression
stapedius
stylohyoid
posterior belly of digastric (from second pharyngeal arch)
what is the general visceral efferent supply of the facial nerve (psymp)
superior salivatory nucleus in the pons
lacrimal gland nasal cavity sinuses palate submandibular and sublingual glands
what is the special visceral afferent function of the facial nerve
taste from anterior 2/3rds of tongue (nucleus solitarius)
superior salivatory nucleus (cn7)
psymp secretomotor to lacrimal gland, nasal and oral cavities, submand and subling glands
where does the motor root of 7 and nervus intermedius emerge
cerebellopontine angle
where does the motor root of 7 go after emerging at the cerebellopontine angle
enters the petrous temporal bone at the internal acoustic meatus with cn 8 and the labyrinthine artery
where is the facial nerve at risk of compression
at the internal acoustic meatus- compression will affect muscles of facial expression and stapedius
where does the chorda tympani arise from cn 7
just before the stylomastoid foramen
what is the chorda tympani
a branch of the facial nerve that originates from the taste buds in the front of the tongue, runs through the middle ear, and carries taste to the brain
it joins the facial nerve inside the facial canal at the level where the facial nerve exits the skull
what 3 nerves are involved in taste
glossopharyngeal
facial (chorda tympani)
vagus
what is the geniculate ganglion
neurons of the facial nerve located in the facial canal of the head
motor, sensory and psymp
innervates lacrimal gland, submandibular, sublingual, tongue, palate, pharynx, external auditory meatus, stapedius, stylohyoid, digastric, muscles of facial expression
