Bones and Muscles · 44. Muscles of arm. Brachial fascia.
Covers the muscles of the arm in two groups. The anterior group includes coracobrachialis, biceps brachii and brachialis, with origins, insertions, nerve supply, actions and blood supply given for each. The posterior group is represented by triceps brachii, with its three heads. It closes with the brachial fascia, describing its continuity with the deltoid, pectoral and antebrachial fasciae and its attachments at the shoulder and elbow.
Topic 43 of 264 in the MU Sofia syllabus for Anatomy (Dental Medicine, Year 2). The free AceMed note covers it in 5 sections, about 347 words (2 min of reading), with 12 flashcards.
In this note
ARM MUSCLES
Anterior group:
Posterior Group:
BRACHIAL FASCIA
Attachments & Continuity:
Anterior group:
1 Coracobrachialis m.
O: Apex of cricoid process of the scapula.
I: Medial side of the midshaft of the humerus.
F: Flexes the arm
B.S: Muscular br. of the brachial art.
2 Biceps brachii
I: The long and short heads converge to form a single tendon, which inserts onto the radial tuberosity.
As the tendon enters the forearm, a flat sheet of connective tissue (the bicipital aponeurosis) fans out from the medial side of the tendon to blend with deep fascia covering the anterior compartment of the forearm.
Short head (medially)
O: Coracoid process
Long head stabilize the shoulder joint.
O: as a tendon from the supraglenoid tubercle of the scapula.
I: Radial tuberosity
F: strong flexion & supination of the forearm.
B.S: Brachial art.
N: Musculocutaneus n. (C5-C6)
3 Brachialis:
O: Distal half of the anterior aspect of the humerus
*Lies beneath the biceps brachii
I: Tuberosity of the ulna.
N: Musculocutaneus n. (small lateral part by Radial n.)
F: Flexes the forearm at the elbow joint.
B.S: Brachial, radial recurrent a.
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