"Origin Stories" (Muscle Origins)
The deltoid muscle originates from these two bones in the shoulder.
What are the clavicle and scapula?
The supraspinatus muscle inserts onto this bony landmark of the humerus.
What is the greater tubercle?
The deltoid is responsible for this primary action at the shoulder joint.
What is abduction?
This muscle originates from the occipital bone, nuchal ligament, and spinous processes of C7-T12, inserting onto the clavicle, acromion, and spine of the scapula.
What is the trapezius?
This muscle assists in both flexion and horizontal adduction of the shoulder joint.
What is the pectoralis major?
his muscle group originates from the pubis and runs vertically along the abdomen, helping with trunk flexion.
What is the rectus abdominis?
The trapezius inserts onto the lateral third of this bone.
What is the clavicle?
The pectoralis major is involved in these two actions of the humerus.
What are adduction and medial rotation?
This muscle, with origins on the sacrum, iliac crest, and thoracolumbar fascia, inserts on the lower ribs and lumbar vertebrae.
What is the latissimus dorsi?
When raising the arm above the head, this muscle initiates abduction of the shoulder before the deltoid takes over.
What is the supraspinatus?
The infraspinatus muscle originates from this part of the scapula.
What is the infraspinous fossa?
The latissimus dorsi inserts into this groove on the humerus.
What is the intertubercular groove?
The infraspinatus assists in this action of the shoulder joint.
What is lateral rotation?
The sternocleidomastoid originates from these two bony landmarks.
What are the sternum and clavicle?
During shoulder adduction, this muscle assists the latissimus dorsi in pulling the arm toward the body.
What is the teres major?
This muscle originates from the iliac crest and inserts into the twelfth rib and lumbar vertebrae, playing a role in lateral flexion of the spine.
What is the quadratus lumborum?
The rhomboid minor muscle inserts onto this structure on the medial border of the scapula.
What is the root of the spine of the scapula?
The teres minor is one of the rotator cuff muscles and is responsible for this movement of the shoulder joint.
What is lateral rotation?
This muscle originates from both the clavicle and sternum and inserts into the greater tubercle of the humerus.
What is the pectoralis major?
This muscle performs downward rotation of the scapula, especially during climbing or pulling activities.
What is the rhomboid major?
The rhomboid major originates from the spinous processes of these thoracic vertebrae.
What are T2 to T5?
The teres major inserts at this location on the humerus.
What is the crest of the lesser tubercle?
The rhomboids are responsible for these two primary movements of the scapula.
What are retraction (adduction) and elevation?
The levator scapula originates from these cervical vertebrae and inserts onto the superior angle of the scapula.
What are C1 to C4?
This pair of muscles work together to rotate the scapula upward during overhead movements.
What are the trapezius (upper fibers) and serratus anterior?