A term used for a muscle that has two heads. The biceps femoris ?exes the knee and extends the hip, and the biceps brachii supinates the forearm and ?exes the elbow and shoulder.
n. a muscle with two heads. The biceps brachii extends from the shoulder joint to the elbow (see illustration). It flexes the arm and forearm and supinates the forearm and hand. The biceps femoris is situated at the back of the thigh and is responsible for flexing the knee, extending the thigh, and rotating the leg outwards.
a deep tendon reflex mediated by the fifth cervical *spinal nerve (C5). The examiner’s thumb or index finger is placed over the patient’s biceps tendon in the elbow crease and struck sharply with a tendon hammer; the normal response is a reflex contraction of the biceps and flexion of the elbow. The jerk is exaggerated in upper *motor neuron lesions, such as a stroke, and reduced or absent in lower motor neuron lesions, such as a disc herniation, peripheral nerve injury, or peripheral neuropathy (e.g. diabetes, alcoholism).... biceps jerk
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