Semitendinosus - Attachments, Actions & Innervation
Biceps femoris: origin, insertion, action and innervation.
Attachments of Biceps Femoris Muscle Long Head: Origin & Insertion
Origin: (proximal attachments)
a.Ischial tuberosity of os coxa.
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Attachments of Biceps femoris (short head): Origin & Insertion
Origin: (proximal attachments):
Distal linea aspera & lateral supracondylar ridge of femur.
Insertion: (distal attachments):
Head of fibula and lateral condyle of tibia.
Actions of Biceps Femoris Muscle Long Head on the leg (tibia & fibula):
a. Flexes leg at knee.
b. Laterally rotates leg at knee when knee is flexed.
c. It also extends thigh at hip.
Actions of Biceps Femoris Muscle Short Head on the Leg:
Flexes the leg at the knee; laterally rotates leg when the knee is flexed.
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Nerve to Muscle and its Spinal Segment:
Long head: Tibial part of sciatic nerve (S1 – S3).
Short head: Common peroneal part nerve (L5, S1, S2).