Where does the triceps brachii lateral head originate?

Origin. Origin of Long Head: Infraglenoid tubercle of the scapula. Origin of Lateral Head: Lateral and posterior surfaces of the humerus above the radial groove and lateral intermuscular septum. Origin of Medial Head: Posterior surfaces of the humerus below the radial groove and from the medial intermuscular septum.

What is the Triceps brachii origin and insertion?

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. Insertion: Proximal end of olecranon process of ulna and fascia of forearm.

What head is the lateral most head of the Triceps brachii?

Origin: Long head – infraglenoid tubercle of scapula. Medial head – posteriorly on the shaft of the humerus below the radial groove. Lateral head – posteriorly on the humerus, above the radial groove.

What does the lateral head of the triceps do?

The lateral head is used for movements requiring occasional high-intensity force, while the medial fascicle enables more precise, low-force movements. With its origin on the scapula, the long head also acts on the shoulder joint and is also involved in retroversion and adduction of the arm.

What are the 3 heads of the triceps?

Triceps brachii (TB) is the largest arm muscle responsible for elbow extension and horizontal arm abduction and also participates as an antagonist muscle during elbow flexion (Hussain et al., 2018). This muscle comprises three heads, namely, the long, lateral and medial heads.

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What nerve controls the triceps?

The triceps brachii muscle is the sole muscle occupying the posterior compartment of the upper arm and is innervated by the radial nerve (C6–C8). It is composed of three tendinous origins: the long, lateral, and medial heads. The long head originates at the infraglenoid tuberosity of the scapula.

What is the most lateral muscle of the Antebrachium?

Most lateral muscle of the antebrachium. Proximal oblique muscle near the carpal region on the lateral side. Transverse muscle that is distal to the flexor pollicis longus near the carpal region on the lateral side. In the cubital region at the superior end of the carpi ulnaris and extensor digitorum.

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