Brachialis muscle

Origin The brachialis originates from the anterior surface of the distal half of the humerus, Innervation The brachialis muscle is innervated by the musculocutaneous nerve (also Casserio nerve), which runs on its superficial surface, between it and the biceps brachii. Variation The muscle is occasionally doubled; additional muscle slips to the supinator, pronator teres, biceps brachii, lacertus fibrosus, or radius are more rarely found. ==Function==

The brachialis flexes the arm at the elbow joint. Unlike the biceps, the brachialis does not insert on the radius, and does not participate in pronation and supination of the forearm. ==History==

Etymology The brachialis muscle and brachial muscle can be considered as the anglicized variant of the Latin expression musculus bracchialis. In classical Latin bracchialis means of or belonging to the arm, and is derived from classical Latin bracchium,"arm". ==Additional images==

File:Brachialis muscle - animation03.gif|Position of brachialis (shown in red). Animation. File:Brachialis muscle01.png|Still image. File:Gray413 color.png|Horizontal section through the middle of upper arm. (Brachialis labeled at center left.) File:Muscles of upper limb.(cross section - human cadaver).jpg|Muscles of forearm, including insertion of brachialis tendon. Cross section. (Brachialis labeled at bottom left.) File:Gray207.png|Left humerus. Anterior view. File:Gray213.png|Bones of left forearm. Anterior aspect. File:Nerves_of_the_left_upper_extremity.gif|Nerves of the left upper extremity. File:Slide10zzz.JPG|Brachialis muscle (labeled in green text) ==See also==