You have the pectoralis major muscle in the chest wall. It arise from the sternum and the clavicle. It is inserted on the lateral part of the bicipital groove.
The muscle you are referring to is the subscapularis muscle. It originates on the subscapular fossa of the scapula and inserts on the lesser tubercle of the humerus. It is responsible for medial rotation of the shoulder joint.
The biceps brachii muscle.
The triceps originates on the scapula and proximal humerus and inserts on the olecranon process. The muscles has three heads (hence its name) so it has multiple origins.
The pectoralis major is a muscle that does not attach to the ribs or the iliac crest. Instead, it primarily originates from the clavicle and the sternum and inserts into the humerus. Its primary functions include shoulder flexion, adduction, and internal rotation.
The rotator cuff muscles are referred to occasionally as the SITS muscles. The Supraspinatus, Infraspinatus, Teres minor and the subscapularis. The Supras. originates on the scapula and inserts on the humerus. The Infras. originates on the scapula and inserts on the humerus(greater tubercle. The Teres minor originates on the scapula and inserts on the humerus. The Subscapularis originates on the scapula and inserts on the humerus(lesser tubercle). The function of this muscle group is to stabilize the shoulder joint. Hope this helps.
The brachialis muscle originates on the distal anterior humerus and insert at the coronoid process. The function of the brachialis is flexion at the elbow.
Latissimus dorsi
The sternocleidomastoid muscle inserts at the clavicle. It originates from the sternum and the clavicle, and its primary actions involve rotating and flexing the head.
supraspinatus
The occipitofrontalis muscle originates on the occipital bone and inserts on the skin and muscle around the eye. It is responsible for raising the eyebrows and wrinkling the forehead.
Yes, the sternocleidomastoid muscle is named for its origins on the sternum (sterno-) and clavicle (cleido-) and its insertion on the mastoid process of the temporal bone.
lateral rotation