exam 2 hypoglossal nerve Flashcards
the hypoglossal nerve carries what type of information?
exclusively motor
what muscles groups are supplied by the hypoglossal?
intrinsic and extrinsic muscles of the tongue with the exception of the palatoglossus
the hypoglossal is formed by axons from cell bodies located where?
nucleus of he hypoglossal nerve
where is the nucleus of the hypoglossal nerve located?
floor of the rhomboid fossa
the hypoglossal nerve emerges as a series of rootlets between what?
the pyramid and the olive of the medulla oblongata
the rootlets of the emerging hypoglossal combine to form two bundles which exit the skull through what?
the hypoglossal canal
what is the combination point of the two bundles into one?
exiting the hypoglossal canal
after combining the hypoglossal descends to reach where?
base of the tongue
while descending to reach the base of the tongue what does the hypoglossal nerve do?
forms a loop known as the arch of the hypoglossal nerve
what does the hypoglossal nerve do upon reaching the base of the tongue?
distributes into terminal branches to supply the muscle of the tongue
some cervical fibers will travel with the hypoglossal to supply what muscle?
geniohyoid and thyrohyoid muscle
what is the communication relationship between the first and second cervical nerves and the hypoglossal?
they travel with but do not incorporate while eventually separating
upon the separation of the first and second cervical nerves from the path of hypoglossal, they form what structure?
they form the superior root of the ansa cervicalis
lingual branches are given off of the hypoglossal to supply what muscles?
hypoglossus
genioglossus
styloglossus
clinical considerations of the hypoglossal nerve?
hemiatrophy tongue and larynx will deviate
tongue to side of lesion
larynx to unaffected side
