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Triceps Brachii Muscle (Long Head). The long head of the triceps brachii muscle is a muscle of the back of the arm, originating from the scapula and shoulder to insert at the elbow.The triceps brachii has three heads (connective immovable muscle) and is the only muscle on the back of the upper arm.It connects the humerus (upper arm bone) and the scapula (shoulder blade) to the ulna (longest of the forearm bones) and is the primary extensor of the elbow.lick to read more below. The long head of the triceps brachii muscle is a muscle of the back of the arm, originating from the scapula and shoulder to insert at the elbow. The triceps brachii has three heads (connective immovable muscle) and is the only muscle on the back of the upper arm.
1.5.2.16.3.1.1.1 This muscle is the most visible and superficial muscle of the upper arm and one of the primary arm flexors. The origin of the biceps brachii is on the supraglenoid tubercle of the scapula & Apex of coracoid process of the scapula.It inserts on the Radial tuberosity & bicipital aponeurosis..5.2.21.1.1 Most of the muscles in this grouping act to flex or extend the leg (Tibia & Fibula) although noted exceptions such as the hamstrings (thigh extension), Rectus Femoris (thigh flexion), Sartorius (thigh flexion & lateral rotation) and Gracilis (thigh adduction) act on the thigh as well.