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any muscle having three heads, or points of attachment, but especially the triceps brachii at the back of the upper arm. One head originates on the shoulder blade and two on the upper-arm bone, or humerus. Uniting part of the way down the arm, the heads swell into the belly, or muscle proper. This tapers to a tendon that rounds the elbow and attaches to the ulna, the larger of the two forearm bones. Since contraction of the triceps straightens the arm, the muscle is called an extensor. It also helps lock the elbow when the forearm pushes forward against resistance. The triceps works in coordination with a flexor muscle, the bicepsbiceps
, any muscle having two heads, or fixed ends of attachment, notably the biceps brachii at the front of the upper arm and the biceps femoris in the thigh. Originating in the shoulder area, the heads of the biceps merge partway down the arm to form a rounded mass of tissue
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 brachii of the upper arm.



a muscle that arises from three heads. The triceps muscle of the arm, situated on the posterior surface of the humerus, extends the forearm at the elbow joint. The triceps muscle of the calf is at the back of the leg below the knee; it consists of the two-headed gastrocnemius muscle and the one-headed soleus muscle, and it flexes the foot at the ankle joint.


any muscle having three heads, esp the one (triceps brachii) that extends the forearm
References in periodicals archive ?
Changes in strength, endurance, and fatigue during a resistance-training program for the triceps brachii muscle.
Electromyographic (EMG) data for the pectoralis major, anterior deltoid, triceps brachii, and biceps brachii were collected during all exercises with the barbell and the Smith Machine.
Las perdidas por coccion fueron menores en los musculos Infraspinatus, Longissimus thoracis y mayores en los musculos Supraspinatus, Triceps brachii, Gluteus medius, Semimembranosus, Semitendinosus, Quadriceps femoris y Biceps femoris (Cuadro 2, p < 0.
These authors observed coactivation values between 2 to 28% of the maximal activation (during a MVC) of the biceps brachii during elbow extension, between 20 to 38% of the maximal activation of brachioradialis and between 15 and 49% of the maximal activation of the triceps brachii during the elbow flexion.
The absolute weight of triceps brachii muscle of control males was significantly superior to that of the Phenobarbital exposed (P< 0.
En relacion con la medicion de la textura en carne cruda se encontro que el Latissimus dorsi presento la menor textura (2,03 kg-F) seguido por el musculo Biceps femoris (4,55 kg-F), mientras que entre los musculos Flexor digitorum superficiales, Gastrocnemius, Triceps brachii y Quadriceps femoris no hubo diferencia significativa (P <0,05), la menor textura del musculo Latissimus dorsi posiblemente sea debida a que este musculo esta sometido a menor ejercicio fisico que los restantes.
En cambio, en Dendrocygna, estos fasciculos son alargados yen general, anchos en su origen (ocurre en los musculos Biceps brachii y Triceps brachii, ver figura 1B y 2B).
These muscles were the biceps brachii long head (BLONG), biceps brachii short head (BSHORT), triceps brachii long head (TLONG), triceps brachii lateral head (TLAT), triceps brachii medial head (TMED), brachialis (BRA), and brachioradialis (BRAD).
A lot of the exercises focus on the triceps brachii muscles, which are on the back of the upper arm.
These results further demonstrated that the total number of repetitions were not significantly different between sequences; however, it was observed that there was an increase in triceps brachii activation and a performance decrement during the bench press exercise with a PE sequence.
In contrast, in the triceps brachii and pectoralis major, the authors observed higher EMG activity on SS.