Week 3 - Cranial Nerves

Question 1

glossopharyngeal nerve CN IX

Answer 1

SVA and GVA fibers - posterior pharynx, posterior 1/3 tongue, carotid sinus and body (at common carotid bifercation) with cell bodies in ganglia of glossopharyngeal nerve; SVE - cell body in nucleus ambiguus with motor to stylopharyngeus, associated with 3rd pharyngeal arch, afferent gag reflex

Question 2

vagus nerve CN X

Answer 2

SVA and GVA - larynx sensation and taste with cell bodies in vagal ganglion, SVE - cell body in nucleus ambiguus to pharyngeal and laryngeal muscles, associated with 4th and 6th pharyngeal arches, efferent gag reflex

Question 3

pterygopalatine ganglia

Answer 3

parasympathetic from superior salivatory nucleus -> facial nerve -> greater petrosal nerve (joins with sympathetics from deep petrosal nerve) -> nerve of pterygoid canal -> pterygopalatine ganglion -> lacrimal gland + nasal mucosal glands + palatine glands

Question 4

submandibular ganglia

Answer 4

parasympathetic superior salivatory nucleus -> facial nerve -> chorda tympani -> joins lingual nerve (branch of V3) -> submandibular ganglion -> submandibular glands

Question 5

sympathetic to facial glands

Answer 5

ventral horn spinal cord -> sympathetic chain -> superior cervical ganglion -> follows lingual and facial to submandibular glands + follows maxillary to sphenopalatine to nasal mucosal glands and lacrimal glands