It’s also responsible for arm abduction, extension, and lateral rotation. Deltoid is responsible for flexion and medial rotation of the arm. ![]() Trapezius is responsible for elevating the shoulder blade and rotating it during arm abduction.The large shoulder muscles are responsible for most of the shoulder’s work. Triceps is a long muscle that runs along the back of the upper arm, from the shoulder to the elbow.Įach muscle and muscle group plays a role in supporting your shoulder and allowing the wide range of motion of your arms and shoulder.Biceps brachii, or biceps, is a two-headed muscle that starts in two points at the top of the shoulder blade and comes together at the elbow.Latissimus dorsi, known as lats, are large muscles in the middle of the back stretching from the backbone to the lower part of the shoulder blade.Pectoralis minor is a thin, flat muscle just under the pectoralis major that connects to the third, fourth, and fifth ribs.It’s a triangular muscle on the front of the upper arm, beginning at the shoulder blade. Subscapularis is the largest and strongest of the rotator cuff muscles.It’s overlapped by the teres major and infraspinatus muscles. Teres minor is a narrow muscle on the underside of the upper arm that connects the shoulder blade to the upper arm.Infraspinatus is a wide triangular muscle that attaches to the rear of the shoulder blade, below the supraspinatus.Supraspinatus is a narrow triangular muscle at the rear of the shoulder blade.Rhomboid major is a flat trapezoid muscle in your back that reaches from the second, third, fourth, and fifth vertebrae to the shoulder blade.Īnother four muscles comprise the shoulder rotator cuff:. ![]()
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