Dominic Stone
The gracilis muscle is a medial thigh muscle that is involved in multiple actions, including knee flexion, hip adduction, and tibia medial rotation. It originates from the pubic symphysis, the inferior pubic ramus, and the ischium and then inserts distally into the medial condyle of the knee. The gracilis muscle is commonly used in reconstructive surgery, either as a pedicled flap or as a free microsurgical flap, and is also utilized for the treatment of anal incontinence. Its name is derived from the Latin 'gracilis', meaning thin or slender, reflecting its long and narrow shape.
| Characteristics | Values |
|---|---|
| Location | Medial compartment of the thigh |
| Muscle Type | Long, narrow, strap-like, skeletal muscle |
| Origin | Pubic symphysis, inferior pubic ramus, ischium, and the body of the pubis |
| Insertion | Distally into the medial condyle of the knee |
| Blood Supply | Medial circumflex femoral artery, superficial femoral artery, deep femoral artery, descending genicular artery, and the anterior branch of the obturator artery |
| Innervation | Anterior branch of the obturator nerve |
| Actions | Adduction of the thigh at the hip, flexion of the leg at the knee, medial rotation of the tibia, hip flexion, hip internal rotation |
| Length | Approximately 25 cm |
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What You'll Learn
The gracilis muscle is a medial thigh muscle
The gracilis muscle originates from the pubic symphysis, the inferior pubic ramus, and the ischium. It then inserts distally into the medial condyle of the knee. The muscle is involved in multiple actions. It medially rotates the leg at the knee joint while the joint is held in a semi-flexed position. It also assists in flexion of the leg at the knee joint and adduction of the thigh at the hip joint.
The gracilis muscle is commonly used in reconstructive surgery, either as a pedicled flap or as a free microsurgical flap. It can be used to treat anal incontinence and in the reconstruction of upper and lower limbs, as well as in breast reconstruction. The muscle may be split to reduce bulk for facial reanimation and to repair hand muscles.
The gracilis muscle is innervated by the anterior branch of the obturator nerve. Its primary blood supply is the medial circumflex femoral artery, which originates from the deep femoral artery. The obturator nerve innervates the gracilis muscle via the lumbar spinal vertebrae.
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It is involved in multiple actions, including knee flexion
The gracilis muscle is a long, thin, strap-like skeletal muscle located in the medial compartment of the thigh. It is the most superficial muscle on the medial side of the thigh and the only adductor of the thigh that crosses and acts on two joints: the hip and knee. The muscle is involved in multiple actions, including knee flexion.
The gracilis muscle aids in knee flexion by working with the hamstrings, sartorius, gastrocnemius, plantaris, and popliteus muscles. Together, these muscles are known as knee flexors. The gracilis muscle is responsible for bending the knee, with the most important function being to help the hamstring muscles flex the knee. This is evident during the initial swing phase of walking or during boat rowing.
The gracilis muscle also plays a role in medial rotation of the leg at the knee joint when the joint is held in a semiflexed position. This medial rotation of the leg becomes evident when walking, with the foot solidly planted on the ground. Additionally, the gracilis muscle assists in the adduction of the thigh at the hip joint, which involves pulling the thighs together.
The gracilis muscle is commonly used in reconstructive surgery, particularly in the reconstruction of upper and lower limbs, and in breast reconstruction. It can also be used to restore forearm function or in the dynamic reconstruction of facial paralysis.
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It is used in reconstructive surgery
The gracilis muscle is a medial thigh muscle, originating from the pubic symphysis, the inferior pubic ramus, and the ischium. It is a long, narrow, strap-like type of skeletal muscle. The muscle is involved in multiple actions, including medial rotation of the leg at the knee joint and assisting in flexion of the leg at the knee joint.
The gracilis muscle is widely used in reconstructive surgery (graciloplasty), either as a pedicled flap or as a free microsurgical flap. It is commonly used in the reconstruction of upper and lower limbs and in breast reconstruction. The muscle may be split to reduce bulk for facial reanimation and to repair hand muscles. It can also be used to fashion an external anal sphincter.
In facial reanimation procedures, the gracilis muscle is removed from the inner thigh through a skin incision. The nerve and blood vessels that supply the gracilis muscle are carefully removed along with the muscle and are then reconnected to nerves and vessels in the face and/or neck. This allows patients with facial paralysis to regain the ability to smile, frown, and make other facial expressions. The nerve that moves the gracilis muscle (the obturator nerve) must be connected to a new nerve supply in the patient's face.
The gracilis muscle flap procedure is a highly specialized surgery that may be used to treat congenital facial paralysis. It involves transplanting a small portion of the patient's inner thigh muscle, along with its associated blood supply and nerve, into the face. This procedure can also be used for soft tissue filling for surgical defects and in the reconstruction of total or near-total glossectomy defects.
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It is the most superficial of all medial thigh muscles
The gracilis muscle is a medial thigh muscle that is located in the medial compartment of the thigh. It is the most superficial of all medial thigh muscles, meaning it is located close to the skin's surface. This makes it easy to palpate and identify. The gracilis muscle originates from the pubic symphysis, the inferior pubic ramus, and the ischium, and then inserts distally into the medial condyle of the knee. It is a long, narrow, strap-like type of skeletal muscle, and its name is derived from the Latin word "gracilis," meaning slender.
The gracilis muscle is involved in multiple actions, including medial rotation of the leg at the knee joint while the joint is held in a semiflexed position. It also assists in flexion of the leg at the knee joint and adduction of the thigh at the hip joint. The muscle is innervated by the anterior branch of the obturator nerve, which can measure up to 12 cm in length. The obturator nerve arises from the lumbar plexus with nerve roots from L2-L4. The gracilis muscle receives its blood supply from several arteries, including the medial circumflex femoral artery, superficial femoral artery, deep femoral artery, descending genicular artery, and the anterior branch of the obturator artery. Its primary blood supply is the medial circumflex femoral artery.
The gracilis muscle is commonly used in reconstructive surgery, a technique called graciloplasty. It can be used as a pedicled flap or as a free microsurgical flap for the reconstruction of upper and lower limbs, breast reconstruction, and the restoration of forearm function. The muscle may be split to reduce bulk, making it useful in facial reanimation and repairing hand muscles. The gracilis muscle is also used in the treatment of anal incontinence, where it is transferred as a functioning pedicled flap.
The gracilis muscle cannot be tested in isolation, so all the muscles of the medial compartment of the thigh are tested simultaneously by adducting the thigh at the hip joint against resistance while lying in the supine position with the knee extended. This allows for palpation of the gracilis muscle during the test. The gracilis muscle is the most superficial and weakest of the adductor muscle group, and its strategic position in the medial compartment of the thigh gives it an important role in the movements of the lower limb.
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It is innervated by the obturator nerve
The gracilis muscle is located in the medial compartment of the thigh. It is a long, narrow, strap-like skeletal muscle. The muscle is involved in multiple actions, including medial rotation of the leg at the knee joint, flexion of the leg at the knee joint, and adduction of the thigh at the hip joint.
The obturator nerve innervates the gracilis muscle. This innervation occurs via the lumbar spinal vertebrae and the anterior branch of the obturator nerve, specifically the L2-L4 spinal nerves. The obturator nerve is a branch of the lumbar plexus.
The gracilis muscle is unique among the thigh adductors as it crosses and acts on two joints: the hip and the knee. This characteristic enables the gracilis muscle to contribute to several movements, including strong leg flexion and medial (internal) rotation around the knee joint, as well as weak thigh flexion and adduction around the hip joint.
The obturator nerve plays a crucial role in innervating the gracilis muscle, allowing it to function effectively in these movements and contributing to the overall stability and coordination of the lower limb.
Additionally, the gracilis muscle has a significant clinical role. It is commonly used as a flap in microsurgery and reconstructive procedures, such as graciloplasty, where it can be transferred as a pedicled flap or a free microsurgical flap.
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Frequently asked questions
The gracilis muscle is located in the medial compartment of the thigh.
The gracilis muscle is long, narrow, and strap-like. It is the most superficial and medial of the muscles in this compartment.
The gracilis muscle is one of the adductor muscles of the hip. It is involved in multiple actions, including medially rotating the leg at the knee joint, assisting in flexion of the leg at the knee joint, and assisting in adduction of the thigh at the hip joint.
The gracilis muscle cannot be tested in isolation. Therefore, all of the muscles of the medial compartment of the thigh are tested simultaneously by adducting the thigh at the hip joint against resistance while lying in the supine position with the knee extended.
