The Shoulder
Label the Shoulder
 The shoulder is made up of three bones
 _________ – upper
arm bone
_______
 ________ – collar
bone
_______
 _________ – shoulder
blade
_______
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 Girdle
Since 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