Plica

Plica is a term used in anatomy to describe a fold or ridge of tissue. Plicae can be found in various parts of the body and serve different functions depending on their location. They are often involved in increasing the surface area of an organ or structure, which can aid in absorption, secretion, or other physiological processes.

Types of Plica

There are several types of plicae found in the human body, including:

Plica Circularis

The plica circularis (also known as the circular fold) is found in the small intestine. These folds are permanent and help to increase the surface area for nutrient absorption.

Plica Semilunaris

The plica semilunaris is a small fold of tissue located in the eye, specifically in the conjunctiva. It is a vestigial structure that is a remnant of the nictitating membrane found in some animals.

Plica Vocalis

The plica vocalis, commonly known as the vocal fold, is located in the larynx. These folds are essential for phonation, as they vibrate to produce sound when air passes through them.

Plica Synovialis

The plica synovialis is found in the knee joint. It is a fold of the synovial membrane and can sometimes become inflamed, leading to a condition known as plica syndrome.

Plica Syndrome

Plica syndrome is a condition where the plica synovialis becomes irritated or inflamed. This can cause pain and discomfort in the knee, particularly during activities that involve bending or straightening the joint. Treatment often involves rest, physical therapy, and in some cases, surgical removal of the plica.

Related Pages

• Anatomy
• Small intestine
• Conjunctiva
• Larynx
• Synovial membrane
• Plica syndrome