Mollie is also a boot camp instructor, rugby player, fitness coach and health enthusiast. Mollie moved to San Diego from the Midwest in to pursue her passion of playing rugby and to be able to participate in outdoor fitness year-round.
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Save now. Be in a class of your own. Ends soon! Act now. Create your story as an ACE Specialist. Limited time! Talk with an Advisor. Exercise Science. Front anterior muscles of the shoulder: The pectoralis minor muscle is a small triangular shaped muscle that lies deep to pectoralis major muscle and passes as three muscular slips from the thoracic wall ribs III to V to the coracoid process of the scapula. Pectoralis minor draws the scapula forward and downward, and raises the ribs in forced inspiration.
The subclavius muscle is a small muscle that lies deep to pectoralis major muscle. It passes from rib I at the junction between the rib and its costal cartilage to a groove on the inferior lower surface of the clavicle.
It depresses the clavicle, draws the shoulder forward and downward, and steadies the clavicle during movements of the shoulder girdle. Back posterior muscles of the shoulder: The levator scapulae muscle originates from the transverse processes of the cervical vertebra and descends to attach to the superior uppermost and medial near the midline corner of the scapula. This muscle elevates the scapula. Rhomboid major and minor muscles attach from the vertebral column to the medial border of the scapula, slightly below the levator scapulae muscles.
These muscles retract and elevate the scapula. Teres major muscle originates from posterior surface of the inferior angle of the scapula and attaches the medial lip of the intertubercular sulcus which lies on the anterior surface of the humerus. This muscle extends and medially rotates the humerus.
Side lateral muscles of the shoulder: Serratus anterior muscle originates as a number of muscular slips from the outer surfaces and superior borders of the first eight or nine ribs, and fascia covering the first intercostal spaces spaces between each rib. They then form a flattened sheet which passes around the thoracic wall and attaches to the anterior costal surface, that glides over the ribs of the medial border of the scapula. When the whole serratus anterior muscle contracts, it pulls the scapula forward around the rib cage: that's protrusion.
When its upper, or lower fibers contract separately, they help to produce downward or upward rotation of the scapula. Levator scapulae arises here, on the outermost point of the first three cervical vertebrae. It inserts here, on the upper medial corner of the scapula. Levator scapulae helps to elevate the scapula. The rhomboids arise here, from the fourth cervical to the fifth thoracic vertebrae.
They insert here, along the medial border of the scapula. The upper part of trapezius arises from the occiput, and from the nuchal ligament, and from T1 to T3 in the mid-line. It's inserted along the upper edge of the spine of the scapula, around the acromion, and along the lateral third of the clavicle.
The lower part of the trapezius muscle is not so massive. It arises from T4 to T12 in the mid-line. It inserts here, on the lower edge of this part of the spine of the scapula. When the whole of trapezius contracts, it powerfully retracts the scapula. When the upper part contracts, it powerully elevates the scapula. Last on the list of muscles passing from the trunk to the scapula is the one on the front. It's pectoralis minor.
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