Cranial Nerves CN VII, IX, X, XI, XII Flashcards
CN X exits at?
Post olivary sulcus
Name nuclei of CN X vagus?
Dorsal motor nucelus
Nucleus ambiguus
Nucleus of solitary tract
Nucleus of spinal tract of trigeminal
Where do nuclei of CN X reside?
Medulla
Function of CN X?
Parasympathetic to thorax and abdomen.
Motor to pharyngeal constrictors, intrinsic laryngeal muscles, palatine muscles, and upper esophagus for phonation and swallowing.
Taste from larynx and epiglottis.
Sensory to pharynx, larynx, concha of external ear, and meninges of posterior fossa
Lesion to CN X?
Hoarseness, dysphagia, loss of gag reflex, and uvular deviation to strong side.
What is motor nucleus of CN X?
Nucelus ambiggus
What are parasympathetic nuclei of CN X?
Nucelus of solitary tract and dorsal motor nucelus.
What is sensory nucelus of CN X?
Nucelus of spinal tract of trigeminal
What is taste nuclei of CN X?
Nucelus of solitary tract
Origin of CN XI?
Nucelus ambiguus and disperse cell bodies/medulla and cervical segments
Where does CN XI exit?
Post olivary sulcus
Cranial accessory function of CN XI?
Joins vagus nerve to supply muscles of pharynx, larynx, and soft palate
Spinal accessory function of CN XI?
Motor to SCM and traps.
Lesion to CN XI?
Inability to rotate head and shrug shoulders.
What CNs exit skull at jugular foramen?
IX, X, and XI
Origin of CN XII?
Hypoglossal nucelus at level of medulla
Where does CN XII exit at?
Pre-olivary sulcus and then hypoglossal canal
Function of CN XII?
Motor to all of tongue muscles except palatoglossus
Lesion to CN XII?
Ipsilateral tongue paralysis and atrophy
Origin of CN IX?
Nucelus of solitary tract in medulla.
Nucelus ambiguus in medulla.
Inferior salivatory nucelus in pons.
Nucelus of spinal tract of trigeminal.
What is the taste and autonomic nucelus of CN IX?
Nucelus of solitary tract in medulla
What is motor nucelus of CN IX?
Nucelus ambiguus
What is parasympathetic necleus of CN IX?
Inferior salivatory nucelus in pons
Where does CN IX exit?
Post olivary sulcus and medulla
Function of CN IX?
Motor to stylopharyngeus muscle, taste to posterior 1/3 of tongue, sensory to middle ear, tympanic cavity, Eustachian tubes, tonsils, naso-Oro-pharynx, uvula, soft palate, and posterior 1/3 tongue. Parasympathetic to parotid gland
Via what is CN IX parasympathetic to parotid gland?
Otic ganglion
What sends afferent fibers from carotid sinus/body?
CN IX
Describe pathway of preganglionic parasympathetic fibers from CN IX to form tympanic nerve?
Nerve enters plexus and is joined by sympathetic fibers from carotid plexus (superior cervical ganglion) to then form lesser petrosal nerve which synapses in otic ganglion.
Describe path of postganglionic fibers from otic ganglion from CN IX?
Enter auriculotemporal nerve (V3) to supply parotid salivary gland
Name nuclei of CN VII?
Facial nucelus in lower pons at level of facial collliculus.
Nucelus of solitary tract.
Superior salivatory nucelus.
What nucelus is responsible for taste and parasympathetics?
Nucelus of solitary tract
What is solely a parasympathetic nucelus for CN VII?
Superior salivatory nucelus.
What is the motor nucelus of CN VII?
Facial nucelus
Function of CN VII motor nucelus?
Motor to muscles of facial expression, auricular muscles, stapedius, posterior belly of diagastric and stylohyoid muscles.
What is the function of nucelus of solitary tract CN VII?
Taste from anterior 2/3 of tongue via chorda tympani
What is function of superior salivatory nucleus CN VII?
Parasympathetics to lacrimal and serous and mucous glands of nasopharynx, and submandibular and sublingual salivary glands.
What are the peripheral branches of CN VII?
Temporal, zygomatic, buccal, marginal mandibular, cervical
Where does CN VII exit at?
Cerebellopontine angle and exits via stylomastoid foramen
How to examine CN VII?
Facial expression, movements, and taste
What happens if CN VII is lesioned?
Bell’s palsy LMN type facial paralysis (unilateral facial paralysis with inability to wrinkle forehead, raise eyebrow, shut eye, smile, tears over sagging lower eyelid and loss of taste anterior 2/3 tongue.
