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biceps femoris (fĕm′ər-ĭs)
Etymology: L, bis, twice, caput, head, femoris, thigh
one of the posterior femoral muscles. It has two heads at its origin. The biceps femoris flexes the leg and rotates it laterally and extends the thigh, rotating it laterally. It is one of the hamstring muscle group and lies on the posterior, lateral side of the thigh.
biceps femoris A two-headed major muscle of the leg.
Inner medial ischial tuberosity and sacrotuberous ligament.
Head of fibula and lateral condyle of tibia.
Extends thigh and flexes leg.
Tibial branch of the sciatic nerve (L5, S2).
Lateral linea aspera and lateral intermuscular septum.
Lateral condyle of tibia.
Common peroneal branch of the sciatic nerve (L5, S2).
biceps femoris two-headed posterior thigh muscle
origin long head: from medial ischial tuberosity; short head: from femoral linea aspera and the upper half of the supracondylar line
insertion heads unite to insert into head of the fibula
nerve supply long head: sciatic nerve; short head: common peroneal nerve
action hip joint extension and knee joint flexion; external leg rotation from hip when knee joint is flexed; note: short head acts only on the knee joint
a muscle having two heads. There is a biceps muscle in both fore- and hindlimbs. See Table 13. See also bicipital
is a large fusiform muscle lying on the cranial surface of the humerus. Its function is to flex the elbow and integrate the actions of the shoulder and elbow. A medial displacement of the tendon of origin has been reported in dogs, causing a weight-bearing lameness.
a large muscle of the caudolateral part of the thigh. Its function is to extend the hindlimb when propelling the body, during rearing or kicking. All of the joints are affected except those of the digit.
Rupture of the muscle causes acute hindlimb lameness in cattle. Resembles an intermittent upward fixation of the patella, with extension of the stifle and hock.
is elicited in dogs by striking a finger placed on the biceps tendon on the craniomedial aspect of the elbow. An active reflex indicates intact spinal cord segments and nerve roots C6-8 and musculocutaneous nerve. It becomes exaggerated in disease of the upper motor neuron.
biceps tendon ossification
causes lameness in the horse. Is radiographically apparent.