What happens if cranial nerve 9 is damaged?

Glossopharyngeal nerve lesions produce difficulty swallowing; impairment of taste over the posterior one-third of the tongue and palate; impaired sensation over the posterior one-third of the tongue, palate, and pharynx; an absent gag reflex; and dysfunction of the parotid gland.

What does the 9th cranial nerve control?

The glossopharyngeal nerve (cranial nerve IX) is responsible for swallowing and the gag reflex, along with other functions. The glossopharyngeal nerve receives input from the general and special sensory fibers in the back of the throat.

What happens if cranial nerve 3 is damaged?

Third cranial nerve disorders can impair ocular motility, pupillary function, or both. Symptoms and signs include diplopia, ptosis, and paresis of eye adduction and of upward and downward gaze. If the pupil is affected, it is dilated, and light reflexes are impaired.

What muscles are innervated by cranial nerve 9?

Muscles Innervated by Cranial Nerves
Cranial Nerve	Muscle
Glossopharyngeal nerve (CN IX)	Stylopharyngeus muscle
Vagus nerve (CN X)	Muscles of the palate and pharynx except tensor palati muscle (CN V3) Stylopharyngeus muscle (CN IX) All muscles of the larynx
Accessory nerve (CN XI)	Sternocleidomastoid muscle Trapezius muscle

Where is the 9th cranial nerve?

Excerpt. The glossopharyngeal nerve is the 9th cranial nerve (CN IX). It is one of the four cranial nerves that has sensory, motor, and parasympathetic functions. It originates from the medulla oblongata and terminates in the pharynx.

How is cranial nerve 9 and 10 tested?

The gag reflex tests both the sensory and motor components of CN 9 & 10. This involuntary reflex is obtained by touching the back of the pharynx with the tongue depressor and watching the elevation of the palate.

What does the cranial nerve 3 do?

The oculomotor nerve is the third cranial nerve (CN III). It allows movement of the eye muscles, constriction of the pupil, focusing the eyes and the position of the upper eyelid. Cranial nerve III works with other cranial nerves to control eye movements and support sensory functioning.

Where is the 3rd cranial nerve?

midbrain
The oculomotor nerve exits the brainstem near midline at the base of the midbrain just caudal to the mammillary bodies. It passes through the cavernous sinus and proceeds through the supraorbital fissure to reach the orbit of the eye (Figure 1). The third cranial nerve has both somatic and autonomic fibers.

What are cranial nerves 9 and 10?

CRANIAL NERVE 9 (GLOSSOPHARYNGEAL) AND CRANIAL NERVE 10 (VAGUS) CNs 9 and 10 work together to supply the musculature of the pharynx (mostly supplied by CN 10) and transmit visceral afferent information from vascular baroreceptors, and each nerve also has additional individual functions listed below.

How do you test for CN 9?

The later test is usually reserved for patients who have vertigo or balance problems or in the comatose patient when one is testing brainstem function. The motor division of CN 9 & 10 is tested by having the patient say “ah” or “kah”. The palate should rise symmetrically and there should be little nasal air escape.

How is the Abducens nerve cranial nerve VI classified?

The abducens nerve (cranial nerve VI) is a somatic efferent nerve that, in humans, controls the movement of a single muscle: the lateral rectus muscle of the eye that moves the eye horizontally. In most other mammals it also innervates the musculus retractor bulbi, which can retract the eye for protection.

Does the Abducens nerve Decussate?

The abducens nerve (or abducent nerve) is the sixth cranial nerve (CNVI), in humans, that controls the movement of the lateral rectus muscle, responsible for outward gaze. It is a somatic efferent nerve….

Abducens nerve
From	abducens nucleus
Innervates	lateral rectus muscle
Identifiers
Latin	nervus abducens