Anatomy. —The triceps brachii is the principal structure which fills the space between the posterior border of the scapula and the humerus.
However, radial paralysis is encountered following injury to the nerve occasioned by its being stretched, as in cases where the triceps brachii is unduly extended in restraining subjects by means of a casting harness.
The radial nerve supplies branches to the three heads of the triceps brachii, to the common and lateral extensors of the digit and also to the skin covering the forearm.
The triceps brachii is the chief antagonist of the biceps brachii.
Thus it is seen, the biceps brachii is a weight bearing structure, as well as one that has to do with swinging the leg.
It also uses predominantly triceps brachii and anconeous to extend the elbows.
Most latissimus dorsi exercises concurrently recruit the teres major, posterior fibres of the deltoid, long head of the triceps brachii, among numerous other stabilizing muscles.
It primarily works the anterior deltoid, with assistance from the serratus anterior, biceps brachii and clavicular portions of the pectoralis major.
