Vestibulocochlear Nerve VIII Although the vestibulocochlear nerve is responsible for hearing and balance, we will only test the hearing portion of the nerve here. Have your partner close his or her eyes and determine the distance at which he or she can hear the ticking of a clock or stopwatch. Also the glossopharyngeal nerve is responsible for taste on the back part of the tongue.
You could try a few drops of salty or sugar water on this part of the tongue and see if your partner can taste it. Spinal Accessory Nerve XI To test the strength of the muscles used in head movement, put your hands on the sides of your partner's head.
Tell your partner to move his or her head from side to side. Apply only light pressure when the head is moved. Try it! Do you like interactive word search puzzles? Make sure your browser is "java-enabled" and try this one: Cranial Nerve Puzzle More details about the cranial nerves.
Health Conditions Discover Plan Connect. The 12 Cranial Nerves. Medically reviewed by Deborah Weatherspoon, Ph. Olfactory nerve II. Optic nerve III. Oculomotor nerve IV. Trochlear nerve V. Trigeminal nerve VI. Abducens nerve VII. Facial nerve VIII. Vestibulocochlear nerve IX. Glossopharyngeal nerve X. Vagus nerve XI.
Accessory nerve XII. Hypoglossal nerve Cranial nerve diagram What are cranial nerves? Keep reading to learn more about each of the 12 cranial nerves and how they function.
Olfactory nerve. Optic nerve. Oculomotor nerve. Trochlear nerve. Trigeminal nerve. Abducens nerve. Facial nerve. Vestibulocochlear nerve. Glossopharyngeal nerve. Vagus nerve. Accessory nerve. Hypoglossal nerve. Cranial nerve diagram. If the 3rd cranial nerve oculomotor nerve Third Cranial Nerve Oculomotor Nerve Palsy A palsy of the 3rd cranial nerve can impair eye movements, the response of pupils to light, or both.
It droops down over the eye and interferes with vision. When doctors suspect a cranial nerve disorder, they ask the person detailed questions about the symptoms. They also test the function of the cranial nerves Cranial Nerves When a neurologic disorder is suspected, doctors usually evaluate all of the body systems during the physical examination, but they focus on the nervous system.
Examination of the nervous system—the Merck and Co. From developing new therapies that treat and prevent disease to helping people in need, we are committed to improving health and well-being around the world.
The Manual was first published in as a service to the community. Learn more about our commitment to Global Medical Knowledge. This site complies with the HONcode standard for trustworthy health information: verify here. Common Health Topics. Cranial Nerve Disorders. Test your knowledge. Bell palsy is sudden weakness or paralysis of the muscles on one side of the face due to malfunction of the seventh cranial nerve. This nerve moves facial muscles, stimulates salivary and tear glands, detects tastes, and controls a muscle involved in hearing.
Which of the following is often the first symptom of Bell palsy? More Content. The vagus nerve has a range of functions, providing motor, sensory, and parasympathetic functions. The vagus nerve is the longest cranial nerve as it starts in the medulla and extends to the abdomen. Doctors use vagus nerve stimulation therapy to treat various conditions, including epilepsy , depression , and anxiety.
Learn more about the vagus nerve and stimulation therapy here. The accessory nerve provides motor function to some muscles in the neck:. It controls the sternocleidomastoid and trapezius muscles that allow a person to rotate, extend, and flex the neck and shoulders. The spinal component starts in the spinal cord and travels into the skull through the foramen magnum.
From there, it meets the cranial component of the accessory nerve and exits the skull along the internal carotid artery. The hypoglossal nerve is a motor nerve that supplies the tongue muscles. Disorders of the hypoglossal nerve can cause paralysis of the tongue, most often occurring on one side. The twelve cranial nerves are a group of nerves that start in the brain and provide motor and sensory functions to the head and neck.
Trigeminal neuralgia is a nerve disorder that causes abrupt, searing pain in the face and jaw. It affects about one million people worldwide and is…. A nerve conduction velocity test measures how fast the nerves in the body send important signals. If they are too slow, this may indicate nerve damage….
Bell's palsy causes weakness or paralysis of the muscles on one side of the face. It tends to occur due to a malfunction of the facial nerve, usually…. The radial nerve is prone to injury, even from minor incidents, such as sleeping on the arm. Radial nerve injury is also common after breaking the arm.
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