Gracilis

A long, slender muscle located in the inner thigh, playing a role in leg movement.

The gracilis is one of the muscles of the inner thigh and is part of the adductor group. It is a flat, strap-like muscle that aids in the adduction, flexion, and medial rotation of the thigh. Additionally, it can assist in flexing the knee joint due to its attachment points.

Terminologia Anatomica

musculus-gracilis

System

Muscular system

Function

As a key muscle within the adductor group, the gracilis primarily functions to bring the thigh closer to the body's midline, a movement known as adduction. This muscle is active in various physical activities, including walking, running, and squatting, allowing for smoother and more efficient movement of the legs. Its ability to flex and medially rotate the thigh also contributes to stability during activities that require balance and changes in direction. Furthermore, when the knee is flexed, the gracilis engages to assist with movements such as getting up from a seated position or climbing stairs, highlighting its importance in everyday activities and dynamic movements.

Location

The gracilis muscle is situated in the medial compartment of the thigh. It originates from the inferior ramus of the pubis, which is located in the pelvis, and it extends downward to insert into the upper part of the tibia, specifically at the pes anserinus. This places the gracilis muscle adjacent to several other important muscles—including the adductor muscles and the sartorius—allowing it to work synergistically with these muscles for optimizing leg functions.

Did You Know?

The name 'gracilis' comes from the Latin word for 'slender' or 'thin', reflecting its elongated shape.
The gracilis is the only muscle in the human body that is innervated by the obturator nerve while also contributing to the knee's function.
In addition to its muscular roles, the gracilis has been used in surgical procedures as a donor muscle for reconstructive purposes.