What is Cranial nerve XI?
What is Cranial nerve XI?
Introduction. The accessory spinal nerve or XI cranial nerve is essential for neck and shoulder movement, the intrinsic musculature of the larynx, and the sensitive afferences of the trapezius and sternocleidomastoid musculature.
What is the main function of CN XI?
This nerve supplies the sternocleidomastoid and trapezius muscles, which have the following functions: Rotation of head away from the side of the contracting sternocleidomastoid muscle. Tilting of the head toward the contracting sternocleidomastoid muscle. Flexion of the neck by both sternocleidomastoid muscles.
Where is the cranial nerve located?
The cranial nerves are all located on the underside of your brain inside your skull. They come in pairs, one on each side of the brain, and are numbered in Roman numerals I through XII. These are often labeled as CN I, CN II, and so on.
What is the function of the vagus nerve?
The vagus nerve is responsible for the regulation of internal organ functions, such as digestion, heart rate, and respiratory rate, as well as vasomotor activity, and certain reflex actions, such as coughing, sneezing, swallowing, and vomiting (17).
What would happen if there were nerve damage to the sternocleidomastoid?
Interruption of the nerve supply to the sternocleidomastoid muscle results in an asymmetric neckline, while weakness of the trapezius muscle can produce a drooping shoulder, winged scapula, and a weakness of forward elevation of the shoulder.
What kind of nerves are involved in swallowing?
The following cranial nerves are involved in swallowing: 1 Trigeminal ( cranial nerve V) 2 Facial ( cranial nerve VII) 3 Glossopharyngeal ( cranial nerve IX) 4 Vagus (cranial nerve X) 5 Hypoglossal nerve (cranial nerve XII)
What is the function of the cranial nerves?
Cranial Nerves. The occulomotor nerve is responsible for motor enervation of upper eyelid muscle, extraocular muscle and pupillary muscle. The trochlear nerve controls an extraocular muscle. The trigeminal nerve is responsible for sensory enervation of the face and motor enervation to muscles of mastication (chewing).
Which is the nerve closest to the front of the head?
For example, your olfactory nerve is closest to the front of your head, so it’s designated as I. Their functions are usually categorized as being either sensory or motor. Sensory nerves are involved with your senses, such as smell, hearing, and touch. Motor nerves control the movement and function of muscles or glands.
Which is nerve responsible for sensory and motor enervation?
The occulomotor nerve is responsible for motor enervation of upper eyelid muscle, extraocular muscle and pupillary muscle. The trochlear nerve controls an extraocular muscle. The trigeminal nerve is responsible for sensory enervation of the face and motor enervation to muscles of mastication (chewing).
How are nerves involved in the digestive system?
Two types of Nerves help control the digestive system. It relaxes the stomach muscle & intestine, also decreases the blood flow to these organs, which in-turn slow down or stop digestion. The intrinsic (inside) nerves are embedding in the walls of the esophagus, stomach, small intestine, and colon.
Where do the nerves of the cranial system come from?
Cranial Nerve Anatomy and Terminology. Spinal nerves emerge sequentially from the spinal cord with the spinal nerve closest to the head (C1) emerging in the space above the first cervical vertebra. The cranial nerves emerge from the central nervous system above this level.
How does the enteric nervous system communicate with the central nervous system?
While described as a second brain, the enteric nervous system normally communicates with the central nervous system (CNS) through the parasympathetic (via the vagus nerve ) and sympathetic (via the prevertebral ganglia) nervous systems, but can still function when the vagus nerve is severed.
Which is the most important nerve in the body?
Our body has a nerve called cranial nerve X, also known as the vagus nerve, which is a very important player in our body. This is because it’s a nerve that innervates the heart, lungs and the digestive tract.