2023年10月30日 · Origin, insertion, innervation and functions of the triceps brachii muscle. Triceps brachii is a three-headed (tri - three, cep - head) muscle of the arm. It represents the only constituent of the posterior muscle group of the arm, spanning almost the entire length of …

The Triceps brachii gets its name with tri referring to "three" muscle heads or points of origin (with Brachii referring to the arm). These include the: Medial head; Lateral head; Long head Image 1: Triceps brachii muscle: Long head red; Lateral head yellow; Medial head green

2024年5月27日 · Learn what is the triceps brachii muscle & where it is located - its parts (long, lateral, medial heads), anatomy, functions, nerve & blood supply, with pictures

In rare cases, the long head can originate from the lateral margin of the scapula and from the capsule of the shoulder joint. [2] The triceps is an extensor muscle of the elbow joint and an antagonist of the biceps and brachialis muscles. It can also fixate the elbow joint when the forearm and hand are used for fine movements, e.g., when writing.

2025年1月27日 · The triceps brachii, or triceps, is a large, three-headed muscle in the posterior compartment of the arm. It is responsible for extending the forearm and maintaining upper limb stability. Origin. The triceps brachii has three heads, each originating from a …

Triceps Brachii Origin: Long head: infraglenoid tubercle of scapula; Lateral head: posterior surface of humerus, superior to radial groove; Medial head: posterior surface of humerus, inferior to radial groove

2021年12月14日 · The triceps brachii muscle is the only muscle in the posterior compartment of the arm. It consists of three heads: lateral, medial and long head and serves primarily to extend the forearm. Learn more about the anatomy of the triceps brachii using the narrated video tutorial and interactive 3D anatomy model.

The triceps brachii muscle contributes to pain in the shoulder, elbow, arm, and hand. Muscle anatomy of the triceps brachii includes origin, insertion, action, innervation and vascular supply. Actions include agonists and antagonists for each movement.

Origin: Long head: scapula, lateral head: posterior humerus, medial head: posterior humerus. Insertion: Olecranon process of ulna. Artery: Profunda brachii. Nerve: Radial nerve. Action: Extends forearm, caput longum adducts shoulder. Antagonist: Biceps brachii muscle.

All three heads of the muscle have different origin sites: Fibers of the long head of the triceps brachii originate from the infraglenoid tubercle of the scapula. Fibers of the lateral head arise from the posterior surface of the humerus superior to the radial groove.