Muscles (Posterior Brachium)

Question 1

What are the muscles of the posterior brachium?

Answer 1

There are 2 muscles in the posterior brachium - the triceps brachii and the anconeus

Question 2

Practice an oral presentation of the triceps brachii

Answer 2

Location: located in the posterior compartment of the brachium

Structure:
a three headed muscle (long head, lateral head, and humeral head)

Function:
extension of the forearm

Anatomy:
PA:
long head: infraglenoid tubercle of the scapula.
lateral head: posterior surface of the humerus (superior to the radial groove). medial head: posterior surface of the humerus (inferior to the radial groove, and deep to the lateral head)

DA: olecranon process of the ulna and fascia of the forearm

NS: radial nerve (C6-8)

Question 3

Practice an oral presentation of the anconeus

Answer 3

Location: part of the posterior brachium compartment, spans a very small distance from the lateral distal arm to the lateral olecranon

Structure: very small triangular shaped muscle

Function: assists the triceps in extension of the elbow / forearm, and stabilizes elbow joint

Anatomy:
PA: lateral epicondyle of the humerus

DA: lateral surface of the olecranon process of the ulna

NS: radial nerve (C7-T1)