Final answer:
The teres minor is a muscle in the rotator cuff of the shoulder, assists in lateral rotation and extension of the arm.
Step-by-step explanation:
The correct statement about teres minor is that it is a muscle in the rotator cuff of the shoulder. The tendons of the deep subscapularis, supraspinatus, infraspinatus, and teres minor connect the scapula to the humerus, forming the rotator cuff, which is a circle of tendons around the shoulder joint. The teres minor particularly helps in the lateral rotation and extension of the arm. In athletes like baseball pitchers, the rotator cuff is prone to injury due to repetitive motion such as bringing the arm overhead to throw a fast pitch.