Cranial Nerve Details Flashcards
What are the 2 classes of fcn for CN III?
GSE and GVE
What is the GSE fcn of CN III?
Inf, sup, med recti mm, inf oblique and palpabrae superioris mm.
What is the GVE fcn of CN III?
Parasymp to constrictor pupillae (constriction) and ciliary mm. (accomodation/focussing)
What are some unique features of the trochlear n.?
- only n. that exits dorsal brain
- only n. where all lower motor neuron fibers decussate
- longest intracranial course
- smallest # of axons
What mm. does the anterior trunk of V-1 innervate?
Mm. of mastication and anterior belly digastric.
- mastication mm: temporalis, masseter, lateral pterygoid, medial pterygoid
What is the GSA innervation of V2?
Skin at mid-face, upper teeth, nasal and palatal mucosa
What is the SVE innervation of CN V?
Mm. of mastication, anterior belly digastric, tensor tympani, mylohyoid, tensor palatini (1st arch mm.)
What are the 3 terminal branches of V1?
NFL
Nasociliary
Frontal–supraorbital (lateral), supratrochlear (medial)
Lacrimal
What is “Standing Room Only Stupid”?
The order of foramina: Superior orbital fissure Rotundum Ovale Spinosum
What CN do you use to force your eyes closed?
CN VII
What CN do you use when you look at bright lights?
CN III (sphincter pupillae)
What CN do you use to open your eyes?
CN III (levator palpabrae)
Which n. opens the pupils wide? Extra wide?
- Sympathetics
- Sympathetics–tarsal m. of Mueller
What is the GVA innervation of CN VII?
Deep sensation from soft palate
What is the SVA innervation of CN VII?
Taste from ant 2/3 tongue
What is the GVE innervation of CN VII?
Motor to sublingual, submandibular, lacrimal glands, + glands of nasopharynx and hard/soft palates.
What is the SVE innervation of CN VII?
Motor to mm. of facial expression, post belly digastric, stylohyoid, stapedius
What is the GSA innervation of CN VII?
Small part of ear pinna sensation
Corda tympani travels to the tongue via what n.?
- Lingual n.
Lingual n. is a branch of what n.?
V-3
(not good question?) What glands does the corda tympani supply? What supplies the other glands of the facial n.?
- Submandibular and sublingual glands
- Greater petrosal n.
CN VII enters the skull at the ___________ and exits the skull at the ___________.
- Internal acoustic meatus
- Stylomastoid foramen
What is the GVA innervation of CN IX?
Deep sensation from post tongue, soft palate, pharynx, mucosa of tymp cavity, post auditory tube, carotid body and sinus
What is the SVA innervation of CN IX?
Taste post 1/3 tongue and adjacent pharynx
What is the GVE innervation of CN IX?
Parotid salivary gland (secretomotor)
3rd pharyngeal arch
What is the SVE innervation of CN IX?
Stylopharyngeus m.
Describe the glossopharyngeal n’s path.
GLOAP: Glossopharyngeal n. Lesser petrosal n. Otic ganglion Auriculotemporal n. Parotid gland
What is the GVA innervation of CN X?
Sensory from pharynx, esophagus, trachea, larynx, and abd viscera (“neck and down”)
What is the SVA innervation of CN X?
Taste buds of epiglottis and glottis
What is the GSA innervation of CN X?
Sensation from small part of ear pinna, canal, and tympanic membrane
What is the SVE innervation of CN X?
All mm. of pharynx (except stylopharyngeus), all mm. of the palate (except tensor veli palatini) levator palatini, all mm. of larynx, cricoid cartilage, and esophagus.
What are sx of CN III nerve palsy?
- Downward and outward gaze
- Dilated pupil
- Ptosis (drooping of upper eyelid)
What are sx of CN VI nerve palsy?
When looking one direction, palsied eye cannot gaze laterally (remains straight forward)
What are sx of CN VII nerve palsy?
Bell’s palsy: facial droop
What are sx of CN XI nerve palsy?
Uneven shoulders (trapezius affected). Can affect SCM as well.
What are sx of CN XII nerve palsy?
Tongue deviation in direction of lesion
What CN’s have parsympathetics?
3, 7, 9, 10
Which CN’s share the jugular foramen?
9, 10, 11
Which CN’s relay sensory innervation from the ear skin?
7, 9, 10
CN VII and VIII share what foramen?
Internal acoustic/auditory meatus
