Constrictor

Constrictor is a term used in anatomy to refer to a muscle which narrows or constricts a passage or cavity. The most common constrictors in the human body are the pharyngeal constrictor muscles, which are responsible for swallowing.

Anatomy

The pharyngeal constrictor muscles are a group of three muscles (superior, middle, and inferior) that form the walls of the pharynx, the passage that connects the mouth and nasal cavity to the esophagus. These muscles play a crucial role in the swallowing process, constricting the pharynx to push food down into the esophagus.

Other constrictor muscles in the human body include the pyloric sphincter in the stomach, which controls the passage of food into the small intestine, and the internal anal sphincter, which controls the expulsion of feces from the body.

Function

Constrictor muscles generally function to control the flow of materials through the body's various passages and cavities. They do this by contracting to narrow the passage or cavity, and relaxing to allow it to widen. This action is crucial for many bodily functions, including digestion and excretion.

Clinical significance

Dysfunction of constrictor muscles can lead to a variety of medical conditions. For example, dysfunction of the pharyngeal constrictor muscles can lead to dysphagia, a condition characterized by difficulty swallowing. Similarly, dysfunction of the internal anal sphincter can lead to fecal incontinence, a condition characterized by the inability to control bowel movements.

See also

• Muscle
• Anatomy
• Pharynx
• Esophagus
• Digestive system