The triceps, or triceps brachii, is a large muscle on the back of the upper limb of many vertebrates. It consists of 3 parts: the medial, lateral, and long head. It is the muscle principally responsible for extension of the elbow joint.
Horizontal section of upper arm. Triceps muscle shown in green text
The teres minor is a narrow, elongated muscle of the rotator cuff. The muscle originates from the lateral border and adjacent posterior surface of the corresponding right or left scapula and inserts at both the greater tubercle of the humerus and the posterior surface of the joint capsule.
Conjoint and intact tendon disc of teres minor and infraspinatus muscle.
Intact teres minor tendon with physiologically hypointense signal.
Teres minor muscle