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What nerve supplies the external anal sphincter?
The external anal sphincter is primarily supplied by the inferior rectal nerve, a branch of the pudendal nerve.
What is a sphincter structures?
a ring of muscle that controls the release of an organs products. EXAMPLE: Pyloric Sphincter controls release of chyme. Cardiac Sphincter controls deposition of food into the stomach from the esophagus. External Urethral Sphincter controls release of urine. External Anal Sphincter controls release of defecation.
What kind of muscle controls a circular opening?
A sphincter muscle controls a circular opening in the body. It serves to regulate the passage of substances through the opening by contracting or relaxing. Examples include the anal sphincter and the sphincter muscles in the digestive system.
Which cranial nerve innervates the ear?
The cranial nerve that innervates the ear is the vestibulocochlear nerve (CN VIII). It has two branches: the vestibular nerve that controls balance and the cochlear nerve that controls hearing.
What nerve controls gastrocnemius?
The tibial nerve controls the gastrocnemius muscle. It is a branch of the sciatic nerve and innervates the muscles of the posterior compartment of the leg, including the gastrocnemius.
What nerve controls the pupil?
The pupil is primarily controlled by the oculomotor nerve (cranial nerve III). This nerve regulates the constriction and dilation of the pupil through its control of the sphincter pupillae and dilator pupillae muscles. Additionally, the autonomic nervous system, particularly the parasympathetic fibers of the oculomotor nerve, is responsible for pupil constriction, while sympathetic fibers control dilation.
What controls iris of eye opening and closing?
The opening and closing of the iris, which controls the size of the pupil, is primarily regulated by two sets of muscles: the sphincter pupillae and the dilator pupillae. The sphincter pupillae, controlled by the parasympathetic nervous system, constricts the pupil in bright light or during focusing on nearby objects. Conversely, the dilator pupillae, controlled by the sympathetic nervous system, dilates the pupil in low light or during stress. This dynamic adjustment allows the eye to regulate the amount of light entering the retina.
What muscle is responsible for mydriasis?
a group of smooth muscles called sphincter pupillae cause the pupil constriction which is known as mydriasis.
What is the composite sphincter muscle encircling each eye?
Orbicularis oculi is a wide flat muscle that encircles the eye.
What nerve supplies the external anal sphincter?
The external anal sphincter is primarily supplied by the inferior rectal nerve, a branch of the pudendal nerve.
What is the muscle that is in the iris that keeps light from the pupil called?
The muscle in the iris that controls the amount of light entering the pupil is called the sphincter pupillae. It constricts the pupil in bright light conditions to limit the amount of light that reaches the retina. This action is part of the pupillary light reflex, which helps protect the retina from excessive brightness. In contrast, the dilator pupillae muscle works to widen the pupil in low-light conditions.
Which sphincter would close in the person who was sunbathing?
The sphincter that controls the pupil of the eye.
What are the six intrinsic eye muscles?
The intrinsic muscles of the eye are the dilator (radial), the sphincter pupillae (circular) constrictor muscle and the ciliary muscle. The iris contains the dilator pupillae and the constrictor pupillae with antagonist effects on the diameter of the pupil. The ciliary muscle is a smooth muscle that, when contracted relaxes the suspensory ligament of the lens. Contraction of this muscle is part of the accommodation reflex and under the control of parasympathetic fibers that travel with cranial nerve 3.
The sphincter muscle that controls access to the stomach from the esophagus is called?
cardiac sphincter; or gastroesophageal sphincter; or lower esophageal sphincter (LES); or esophageal sphincter from http://en.wikipedia.org/wiki/Cardia
What sphincter that opens when food or fluids exert pressure on it?
The sphincter that opens when food or fluids exert pressure on it is the gastroesophageal sphincter. Closure of the sphincter is under the control of the vagus nerve.
What is a sphincter structures?
a ring of muscle that controls the release of an organs products. EXAMPLE: Pyloric Sphincter controls release of chyme. Cardiac Sphincter controls deposition of food into the stomach from the esophagus. External Urethral Sphincter controls release of urine. External Anal Sphincter controls release of defecation.
What controls flow of material into duodenum?
pyloric sphincter
