The Shoulder

Label the Shoulder The shoulder is made up of three bones

____

___ _______

_______ _________ – upper

arm bone

_________ – shoulder blade

________ – collar bone

Anatomy of the Shoulder

The head of the humerus fits into a rounded socket in the scapula

A combination of muscles and tendons keeps the humerus centered in the socket

The Shoulder Girdle The muscles of the shoulder girdle act on the _________, primarily to

___________ it. There are ____ major muscles that anchor the scapula.

– Four posterior muscles (T_________, R_________ Major, ___________ Minor, L__________ S____________)

– Two anterior muscles (P___________ Minor, S____________ A_________)

The Shoulder GirdleSince the scapula has _________ _____________with the rib cage it essentially _________

The main function of the shoulder girdle muscles is to _______ the scapula

When the scapula is ______________ it serves as a point of ________ for the muscles of the _____________ (upper arm bone)

Posterior Muscles of the Shoulder Girdle

Anterior Muscles of the Shoulder Girdle

Major Muscles That Act at the Shoulder Girdle

The Shoulder The shoulder joint is the most mobile joint in the body. There are a total of ____ muscles that cross the shoulder joint (inserting

on the humerus).– _____ muscles originate from each scapula.

• S____________, I___________, S___________, T______ Minor, T_______ Major, D__________ and C____________

– ___ muscles originate from the axial skeleton (no attachment on the scapula).• P__________ Major, L____________ D_______

The Shoulder Anterior Deltoid and Pectoralis Major

The Shoulder- Latissiumus Dorsi, Pectoralis Major and Deltoid, Lateral View

The Shoulder – Posterior Muscle of the Shoulder Joint

The Rotator Cuff _____ of the muscles that act at the shoulder are commonly called

the R______ C______. The rotator cuff’s primary stabilizing function is to hold the ________

head in the _______ ________ to prevent _________ (dislocation). The muscles of the rotator cuff can be remembered using the

acronym SITS:– S__________– I___________– T_______ M______– S____________

The Rotator Cuff – Anterior View

The Rotator Cuff – Posterior View

Coracobrachialis

Major Muscles That Act at the Shoulder