CRANIL NERVES2 Flashcards
What is the course of the optic nerve (CN II)?
: The optic nerve carries visual information from the retina to the brain. It passes through the optic canal, forms the optic chiasma, and continues as the optic tract.
What is the function of the trochlear nerve (CN IV)?
The trochlear nerve controls the superior oblique muscle of the eye, which helps with downward eye movement.
Which cranial nerves are involved in the swallowing reflex?
The glossopharyngeal nerve (CN IX), vagus nerve (CN X), and accessory nerve (CN XI) are involved in the swallowing reflex.
What is the function of the vagus nerve (CN X)?
The vagus nerve is responsible for motor control of the muscles of the pharynx, larynx, and palate, as well as parasympathetic control of various organs in the thoracic and abdominal cavities.
Which cranial nerves are responsible for taste sensation from the tongue?
The facial nerve (CN VII) is responsible for taste sensation from the anterior two-thirds of the tongue, while the glossopharyngeal nerve (CN IX) is responsible for taste sensation from the posterior one-third of the tongue.
What is the function of the abducens nerve (CN VI)?
The abducens nerve controls the lateral rectus muscle of the eye, which is responsible for outward (abduction) eye movement.
Name the cranial nerve responsible for sensory innervation of the external ear.
The trigeminal nerve (CN V) provides sensory innervation to the external ear.
What is the function of the accessory nerve (CN XI)?
The accessory nerve is responsible for motor control of the sternocleidomastoid and trapezius muscles, which are involved in head and shoulder movements.
Which cranial nerve is responsible for the gag reflex?
The glossopharyngeal nerve (CN IX) is responsible for the gag reflex.
What is the function of the facial nerve (CN VII)?
The facial nerve controls the muscles of facial expression, taste sensation from the anterior two-thirds of the tongue, and the secretion of tears and saliva.
