Epicranius Muscle
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 masseter muscle originates on the zygomatic arch and inserts on the angle of the mandible. It is responsible for elevating the mandible during jaw closure and is one of the key muscles involved in chewing.
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.
The rectus abdominis muscle originates on the pubic crest and pubic symphysis and inserts on the cartilage of the 6th and 7th ribs and the xiphoid process. It is responsible for flexing the lumbar spine and compressing the abdominal contents.
The biceps brachii muscle inserts on the radius bone. It originates from the scapula and crosses both the shoulder and elbow joints to insert on the radius, allowing it to flex the elbow and supinate the forearm.
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 piriformis originates at the anterior sacrum and inserts at the greater trochanter of the femur.
The muscle that originates from the anterior inferior iliac spine of the hip and inserts onto the proximal end of the tibia is the sartorius muscle. This muscle is the longest muscle in the body and is responsible for flexing, abducting, and laterally rotating the hip joint, as well as flexing the knee joint.
The masseter muscle originates on the zygomatic arch and inserts on the angle of the mandible. It is responsible for elevating the mandible during jaw closure and is one of the key muscles involved in chewing.
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.
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.
Epicranius
Latissimus dorsi
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.
The rectus abdominis muscle originates on the pubic crest and pubic symphysis and inserts on the cartilage of the 6th and 7th ribs and the xiphoid process. It is responsible for flexing the lumbar spine and compressing the abdominal contents.