CN 5 -12 Flashcards
What are the main functions of the trigeminal nerve (CN V)?
General sensation for the face, scalp, oral, and nasal cavities; somatomotor to muscles of mastication.
What is the sensory ganglion of CN V called?
Trigeminal (semilunar) ganglion – contains pseudounipolar neurons with central and peripheral processes.
Through which foramina do the divisions of CN V exit the skull?
V1: Superior orbital fissure, V2: Foramen rotundum, V3: Foramen ovale.
What are the components of CN VII?
Somatomotor, special sensory (taste), visceromotor (parasympathetic).
Which ganglion is associated with taste in CN VII?
Geniculate ganglion.
What glands receive parasympathetic innervation from CN VII?
Submandibular, sublingual, and lacrimal glands.
What happens in a lower motor neuron lesion of CN VII?
Ipsilateral paralysis of the entire face, known as Bell’s palsy.
What are the sensory functions of CN IX?
General sensation from the posterior 1/3 of the tongue, pharynx, and middle ear; taste from the posterior 1/3 of the tongue.
Which reflex is mediated by CN IX?
Carotid sinus reflex (baroreception).
What muscle does the somatomotor component of CN IX innervate?
Stylopharyngeus
What is the visceromotor (parasympathetic) function of CN IX?
Secretomotor innervation to the parotid gland (via the otic ganglion).
What are the primary functions of CN X?
General sensory, special sensory (taste), somatomotor, and visceromotor.
What structures receive general sensory input from CN X?
Larynx, pharynx, esophagus, external ear, and meninges in the posterior cranial fossa.
How does CN X contribute to visceral reflexes?
It monitors and regulates the heart, lungs, and digestive organs.
Which ganglion is responsible for taste from the epiglottis via CN X?
Inferior vagal ganglion.
