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Questions and Answers
Which muscle has a tendinous origin from the body of pubis?
What is the function of the hamstring part of adductor magnus?
Which nerve innervates the adductor magnus muscle?
What is the insertion point of the aponeurosis of the adductor magnus muscle?
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What is the function of the adductor brevis muscle?
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What is the origin of the adductor magnus muscle?
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What is the function of the gracilis muscle?
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Study Notes
Adductor Muscles
- Adductor longus may have a sesamoid bone called Rider's bone in its tendinous origin.
- Adductor brevis is another muscle in the compartment.
Adductor Magnus
- The largest muscle in the compartment.
- Has a tendinous origin from the body of pubis, specifically in the angle between the pubic crest and pubic symphysis.
- Also originates from the anterior surface of the body of pubis, outer surface of the ischio-pubic ramus, and the medial margin of the lower half of the body of pubis.
- The hamstring part originates from the intero-lateral part of the ischial tuberosity, while the adductor part originates from the outer part of the ischiopubic ramus.
- Inserts into the medial margin of the lower half of the femur, specifically the linea aspera in the middle 1/3 of the shaft.
- Also inserts into the line extending from the lesser trochanter to the upper part of the linea aspera.
Nerve Supply
- Anterior division of the obturator nerve supplies the adductor magnus.
- Hamstring part is supplied by the tibial component of the sciatic nerve.
- Pectineus is supplied by the anterior division of the obturator nerve and the femoral nerve.
- Gracilis is supplied by the anterior division of the obturator nerve.
Actions
- Adductor magnus, adductor brevis, and pectineus are all powerful adductors of the thigh and medial rotators of the thigh.
- The hamstring part of the adductor magnus helps in extension of the thigh.
- Gracilis is a flexor and medial rotator of the leg, and a weak adductor of the thigh.
- Pectineus flexes the thigh and adducts it.
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Description
This quiz covers the muscles of the medial compartment of the thigh, including the adductor longus, adductor brevis, and adductor magnus. Learn about their origins, insertions, and functions.
