CN 4-12 Flashcards
primary functions of CN V
sensation of face, mouth, anterior 2/3 tongue, nasal sinuses and meninges
motor for muscles of mastication and tensor tympani muscle
3 major somatosensory branches
V1: ophthalmic division, forehead and scalp, upper eyelid, cornea and nose
V2: maxillary division, lower eyelid, cheeks, temples, upper lip and teeth
V3: mandibular, part of external ear, lower lip, chin, anterior 2/3 of tongue, lower teeth
what are the CN V nuclei
motor trigeminal
principle sensory trigeminal
mesencephalic trigeminal
spinal trigeminal
motor trigeminal nuclei
gives rise to efferent muscles of mastication
principle sensory trigeminal nuclei
afferent discrimination touch, light touch, proprioception to face, dental pressure
mesencephalic trigeminal nuclei
afferent proprioception to jaw
spinal trigeminal nuclei
afferent crude touch, pain, temperature of face
somatotopic
CN VII has motor innervation and sensory innervation to where
somatomotor to muscles of facial expression
parasympathetics to lacrimal and salivary glands
also taste and somatosensory
what CN make up the corneal reflex
CN V and VII
what is the corneal reflex
protective reflex to protect eye from debris and damage
gentle swab to cornea to opthalmic division of trigeminal to spinal trigeminal nucleus to bilateral facial nuclei to facial nerve –> bilateral eye blink
CN IX has motor and sensory innervation to where
somatomotor to stylopharyngeus
somatosensory and taste to posterior 1/3 of tongue
viscerosensory from carotid sinus and carotid body
also somatosensory from middle ear and parasympathetic projections to parotid gland
CN X has motor and sensory innervation to where
somatomotor to pharyngeal muscles (swallowing) and laryngeal muscles (voice box)
parasympathetic to hearts, lungs and digestive tract
viscerosensory from aortic arch
also somatosensory from pharynx, meninges, ext auditory meatus and viscerosensory taste from epiglottis and pharynx
CN IX and X: Gag Relex
reflex contraction of the muscles of the posterior pharynx after stimulation of the posterior pharyngeal wall, tonsillar area or base of the tongue
common way to evaluate the integrity of medulla during brain death examination
gag reflex pathway
CN IX afferent information to nucleus ambiguus to bilateral CN X to pharyngeal muscles to gag response
ipsi gag response: direct gag reflex
contra gag response: consensual gag reflex
CN XI motor innervation
somatomotor to SCM and trap
