CN 9-12 Flashcards
superior vs inferior ganglia of CN 9
superior= GSA
inferior= GVA and SVA
GSA fibers from the CN 9 mediate the afferent limb of the ____ reflex
gag
carotid sinud nerve (Herings nerve) carries ___ fibers from? how?
GVA fiers from the carotid sinus (baroreceptor) and carotid body (chemo)
**via inferior ganglion to nucleus of the solitary tract
what is the only muscle innervated by CN 9?
stylopharyngeus
CN 10 has 4 nuclei in medulla. name them?
two motor: 1) dorsal vagal nucleus (GVE) 2) nucleus ambiguus (SVE) two sensory: 3) nucleus of the solitary tract (SVA, GVA) 4) spinal nuclei of CN 10 (GSA)
the vagus nerve exits the cranium with CN ___ and ____ via the?
9 and 11 via the jugular foramen
vagus carries general senosry afferents form and to where?
afferents from the auricle, external acoustic meatus, and dura mater of posterior cranial fossa to the superior ganglion then to spinal nucleus of CN 10
superior laryngeal nerve off of CN 10
internal branch carries GVA from larynx above vocal cords
-external branch (SVE)
recurrent laryngeal nerve
GVA from larynx below vocal cords
-SVE to laryngeal muscles EXCEPT cricothyroid
GAG REFLEX
afferent= glossopharengeal (CN 9)
efferent= vagus (CN 10)
CN 11 enters and exits cranium where?
- enters at foramen magnum
- exits jugular foramen
rootlets of CN 11 join with CN ____ temporarily as tehy pass thorugh the jugular formaen
CN 10
CN 11 does what?
MOTOR ONLY
-to trapezius and SCM
(turn chin to right to check LEFT SCM)
-SVE fibers
CN 12 nucleus resides?
within the medial rostal medulla
CN 12 function?
motor only! SVE
*supply all the extrinsic and intrinsic muscles of the tongue EXCEPT palatoglossus
