The exercise focuses on the development of the pectoralis major muscle as well as other supporting muscles including the anterior deltoids, serratus anterior, coracobrachialis, scapulae fixers, trapezii, and the triceps.
Its function is to reduce friction between the coracobrachialis, subscapularis and short head of the biceps tendons, thus facilitating internal and external rotation of the shoulder.
Push-ups exercise the pectoral muscles, triceps, and anterior deltoids, with ancillary benefits to the rest of the deltoids, serratus anterior, coracobrachialis and the midsection as a whole.
The anterior humeral circumflex artery runs horizontally, beneath the coracobrachialis and short head of the biceps brachii muscle, in front of the neck of the humerus.
Symptoms include paralysis of the biceps, brachialis, and coracobrachialis (through the musculocutaneous nerve); the brachioradialis (through the radial nerve); and the deltoid (through the axillary nerve).
It may adhere for some distance to the median and then pass outward, beneath the biceps brachii, instead of through the coracobrachialis. 2.
Therefore, the contraction of the coracobrachialis leads to two distinct movements at the shoulder joint.
Actual rupture to the coracobrachialis muscle is extremely rare.
