biceps muscle

biceps muscle

 any muscle with two heads, or points of origin (from Latin bis, “two,” and caput, “head”). In human beings, there are the biceps brachii and biceps femoris.

      The biceps brachii is a prominent muscle on the front side of the upper arm. It originates in two places: the coracoid process, a protrusion of the scapula (shoulder blade); and the upper glenoid cavity, the hollow for the shoulder joint. The tendon of this muscle is attached to the inner protrusion near the head of the radius, a bone of the forearm. The biceps brachii bends the forearm toward the upper arm and is thus used in lifting and pulling movements. It also supinates the forearm (turns the palm forward or upward). The size of the biceps brachii is a conventional symbol of bodily strength.

      The biceps femoris is one of the hamstring muscles at the back of the thigh (leg). It originates in two places: the ischium (lower, rear portion of the pelvis, or hipbone) and the back of the femur (thighbone). The fibres of these two origins join and are attached at the head of the fibula and tibia, the bones of the lower leg. This muscle extends the thigh, rotates it outward, and flexes the leg at the knee.

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Universalium. 2010.

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Look at other dictionaries:

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  • biceps — [ bisɛps ] n. m. • 1704; adj. fin XVIe; mot lat. « qui a deux têtes », de bis et caput → triceps 1 ♦ Anat. Muscle composé de deux portions (ou têtes) distinctes. Le biceps brachial : le biceps (2o). Biceps crural. 2 ♦ Cour. Muscle du bras qui… …   Encyclopédie Universelle

  • Biceps femoris muscle — Biceps femoris Lateral aspect of right leg. Biceps femoris muscle long head labeled …   Wikipedia

  • biceps femoris muscle — biceps muscle of thigh musculus biceps femoris …   Medical dictionary

  • biceps — 1630s (adj.), from L. biceps having two parts, lit. two headed, from bis double (see BIS (Cf. bis )) + ceps comb. form of caput head (see HEAD (Cf. head)). As a noun meaning biceps muscle, from 1640s, so called for its structure. Despite the …   Etymology dictionary

  • Muscle Ischio-Jambier — Muscles ischio jambiers Les muscles ischio jambiers sont des muscles de la cuisse permettant la flexion du genou, ils sont antagonistes du quadriceps (servant à son extension). Ce sont des muscles polyarticulaires qui vont de la hanche jusqu’à… …   Wikipédia en Français

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  • muscle — muscleless, adj. muscly, adj. /mus euhl/, n., v., muscled, muscling, adj. n. 1. a tissue composed of cells or fibers, the contraction of which produces movement in the body. 2. an organ, composed of muscle tissue, that contracts to produce a… …   Universalium

  • Biceps — The biceps is a muscle that has two heads or origins. In Latin, biceps means two headed and is derived from bis , twice + caput , head. There is more than one biceps muscle. The biceps brachii is the well known flexor muscle in the upper arm and… …   Medical dictionary

  • Muscle coactivation — Coactivation of biceps and triceps. The biceps’ EMG is on top, while the triceps’ EMG is on the bottom. Muscle coactivation is a phenomenon in which a muscle is activated coordinately with another muscle. The EMG shown demonstrates the… …   Wikipedia

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