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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?
Sphincter muscles are circular muscles that control the opening and closing of various body passages and openings. They help regulate the flow of substances, such as food or waste, through these passages by contracting and relaxing. Examples include the sphincter muscles of the gastrointestinal tract and the urinary system.
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 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.
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 is a sphincter structures?
Sphincter muscles are circular muscles that control the opening and closing of various body passages and openings. They help regulate the flow of substances, such as food or waste, through these passages by contracting and relaxing. Examples include the sphincter muscles of the gastrointestinal tract and the urinary system.
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 controls flow of material into duodenum?
pyloric sphincter
Ring like muscle that controls the flow from the stomach to the small intestine?
lower esophageal sphincter or gastroesophageal sphincter
Is the ring like muscle that controls the flow from the stomach to the small intestine?
The ring like muscle that controls the flow from the stomach to the small intestine is called the pylorus or the pyloric sphincter. It is divided into two parts: the pyloric antrum which is connected to the body of the stomach and the pyloric canal which is connected to the beginning of the small intestine (the duodenum).
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.
