Dominic Stone
The gracilis muscle is a long, thin, flat muscle located in the medial (adductor) compartment of the thigh. It is the most superficial hip adductor, overlying the adductor longus, adductor brevis, adductor magnus, and pectineus muscles. The gracilis muscle is the only adductor of the thigh that crosses and acts on two joints: the hip and the knee. It is involved in multiple actions, including thigh adduction and flexion, leg flexion, and medial (internal) rotation. The gracilis muscle also has a variety of clinical applications, such as its use in reconstructive microsurgery and the treatment of anal incontinence.
| Characteristics | Values |
|---|---|
| Type | Skeletal muscle |
| Location | Medial (adductor) compartment of the thigh |
| Proximity to body's midline | Yes |
| Shape | Long, slender, strap-like, thin, flat |
| Origin | Pubic symphysis, inferior pubic ramus, ischium |
| Insertion | Distally into the medial condyle of the knee |
| Function | Adducts the thigh, flexes the hip, aids in flexion of the knee, medially rotates the tibia on the femur, assists in flexion of the leg at the knee joint, assists in adduction of the thigh at the hip joint |
| Innervation | Obturator nerve |
| Blood supply | Type II |
| Use in surgery | Yes, widely used in reconstructive surgery (graciloplasty) |
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What You'll Learn
The gracilis muscle is a hip adductor
The gracilis muscle is one of seven hip adductor muscles, which help pull the thighs together. It is the most superficial muscle of the medial (adductor) compartment of the thigh, and the only hip adductor that crosses and acts on two joints: the hip and the knee. The muscle fibres run vertically downwards, ending in a rounded tendon that passes behind the medial condyle of the femur and inserts into the upper part of the medial surface of the tibia.
The gracilis muscle is involved in multiple actions, including thigh adduction, medial rotation of the leg at the knee joint, and flexion of the leg at the knee joint. It assists in balancing the trunk during walking, and helps to stabilise the inner hip and thigh during movement.
The gracilis muscle is commonly used in reconstructive surgery, either as a pedicled flap or as a free microsurgical flap. It can be used in perineal and vaginal reconstruction, as well as in the treatment of anal incontinence. The gracilis muscle can also be used to repair hand muscles and in dynamic reconstruction of facial paralysis.
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It is used in reconstructive surgery
The gracilis muscle is a long, thin, flat muscle located in the medial (adductor) compartment of the thigh. It is the most superficial muscle on the medial side of the thigh and the weakest of the adductor muscle group. The gracilis muscle is a lower limb adductor, allowing for thigh adduction and flexion, leg flexion, and medial rotation.
The gracilis muscle is commonly used in reconstructive surgery, particularly in the form of a pedicled or free microsurgical flap. Its harvest is considered relatively straightforward for surgeons, and its loss rarely affects the patient's functionality. The gracilis muscle flap has a variety of applications, including:
- Regional reconstruction of the lower abdomen, pubis, groin, perineum, and ischium.
- Functional anal sphincter and vaginal reconstruction, especially after oncological surgery.
- Distant reconstruction for the head and neck, including facial reanimation for facial paralysis or dynamic reconstruction of facial paralysis.
- Upper and lower extremity reconstruction, including functional reconstruction for muscle loss and repair of hand muscles.
- Soft tissue reconstruction for distal tibia/fibula fracture following trauma.
The gracilis muscle is particularly useful in these procedures due to its type II blood supply, which allows for transfer on its artery derived from the medial circumflex femoral artery. During the surgery, the gracilis muscle is removed from the inner thigh through a skin incision, along with its nerve and blood vessels, which are then reconnected to the corresponding structures in the recipient site.
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It is a thin, long muscle
The gracilis muscle is a thin, long muscle located in the medial (adductor) compartment of the thigh. It is the most superficial muscle on the medial side of the thigh, and it is also the weakest hip adductor. The gracilis muscle is thin and flat, with a broad origin and a narrow, tapering insertion. It originates from the pubic symphysis, the inferior pubic ramus, and the ischium, and inserts into the medial condyle of the tibia, below the knee joint.
The muscle fibres of the gracilis run vertically downward, ending in a rounded tendon. This tendon passes behind the medial condyle of the femur and curves around the medial condyle of the tibia, where it flattens and inserts into the upper part of the medial surface of the tibia. The gracilis tendon joins with the tendons of the sartorius and semitendinosus muscles to form the pes anserinus, which means "goose's foot" in Latin, due to its three-pronged structure.
The gracilis muscle is unique among the thigh adductors in that it crosses and acts on two joints: the hip and the knee. It assists in flexion of the hip and knee joints, medial rotation of the leg at the knee joint, and adduction of the thigh at the hip joint. These actions are important for maintaining balance and stability during movements such as walking.
The gracilis muscle is also significant in microsurgery and reconstructive surgery. It is commonly used as a flap in microsurgical procedures, either as a pedicled flap or a free flap, for wound coverage and functional muscle transplantation. Its thin and long structure makes it versatile and useful for reconstruction of the upper and lower limbs, breast reconstruction, and restoration of forearm function or facial paralysis.
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It is the most superficial muscle of the thigh
The gracilis muscle is the most superficial muscle of the thigh. It is a long, thin, flat, and slender muscle located in the medial (adductor) compartment of the thigh. It is the most superficial hip adductor, overlying the adductor longus, adductor brevis, adductor magnus, and pectineus muscles.
The gracilis muscle is thin and flattened, broad above and narrow and tapering below. 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 muscle fibres run vertically downward, ending in a rounded tendon. This tendon passes behind the medial condyle of the femur, curves around the medial condyle of the tibia, and inserts into the upper part of the medial surface of the tibia, below the condyle.
The gracilis muscle is involved in multiple actions, including thigh adduction and flexion, leg flexion, and medial (internal) rotation. These actions play important roles in balancing the trunk during walking and other movements of the lower limb. The muscle is also the only hip adductor that crosses and acts on two joints: the hip and the knee.
The gracilis muscle has a wide range of clinical applications. It is commonly used as a flap in microsurgery and reconstructive procedures, such as graciloplasty, where it can be transferred for the treatment of anal incontinence or used in upper and lower limb, breast, and facial reconstruction. The muscle can be split or thinned to reduce bulk, making it versatile for repairing hand muscles and restoring forearm function, among other uses.
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It assists in hip flexion
The gracilis muscle is a long, slender muscle located in the medial (adductor) compartment of the thigh. It is the most superficial muscle on the medial side of the thigh. The gracilis is the only adductor of the thigh that crosses and acts on two joints: the hip and the knee.
The gracilis muscle assists in hip flexion, which involves lifting the thigh or moving it towards the abdomen. This action is also referred to as thigh flexion. When the hip is flexed, the gracilis can contribute to the internal rotation of the hip, turning the femur and the leg inward, towards the midline of thebody. This movement is also called medial rotation.
The gracilis muscle plays a strategic role in the movements of the lower limb, such as adduction, which is its primary action. It 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 is also important for balancing the trunk during walking.
The gracilis muscle is commonly used in reconstructive surgery, particularly in gracilisoplasty for the treatment of anal incontinence and in the reconstruction of upper and lower limbs. It is also used as a ligament for the reconstruction of torn tendons and ligaments, especially in the knee.
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Frequently asked questions
The gracilis muscle is a long, thin, flat muscle located in the medial compartment of the thigh. It is the most superficial hip adductor.
The gracilis muscle originates from the pubic symphysis, the inferior pubic ramus, and the ischium.
The gracilis muscle inserts distally into the medial condyle of the knee.
The gracilis muscle is involved in multiple functions, including thigh adduction, leg flexion, and medial (internal) rotation. It is also used in reconstructive surgery, particularly in the reconstruction of upper and lower limbs.
The gracilis muscle is commonly used in gracilisoplasty for the treatment of anal incontinence and in reconstructive surgery for the upper and lower limbs, breast reconstruction, and dynamic reconstruction of facial paralysis.
