the shoulder
DESCRIPTION
The Shoulder. Label the Shoulder. The shoulder is made up of three bones. Humerus – upper arm bone. Clavicle. Scapula – shoulder blade. Scapula. Clavicle – collar bone. Humerus. Anatomy of the Shoulder. The head of the humerus fits into a rounded socket in the scapula. - PowerPoint PPT PresentationTRANSCRIPT
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The Shoulder
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Label the Shoulder The shoulder is made up of three bones
Hum
eru
s
Scapula
Clavicle Humerus – upper arm
bone
Scapula – shoulder blade
Clavicle – collar bone
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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
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The Shoulder Girdle The muscles of the shoulder girdle act on the scapula, primarily to
stabilize it. There are six major muscles that anchor the scapula.
– Four posterior muscles (Trapezius, Rhomboid Major, Rhomboid Minor, Levator Scapulae)
– Two anterior muscles (Pectoralis Minor, Serratus Anterior)
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The Shoulder GirdleSince the scapula has no bony articulations with the rib cage it essentially floats
The main function of the shoulder girdle muscles is to fixate the scapula
When the scapula is immobilized it serves as a point of origin for the muscles of the humerus (upper arm bone)
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Posterior Muscles of the Shoulder Girdle
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Anterior Muscles of the Shoulder Girdle
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Major Muscles That Act at the Shoulder Girdle
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The Shoulder The shoulder joint is the most mobile joint in the body. There are a total of nine muscles that cross the shoulder joint (inserting
on the humerus).– Seven muscles originate from each scapula.
• Supraspinatus, infraspinatus, subscapularis, teres minor, deltoid, teres major, and coracobrachialis)
– Two muscles originate from the axial skeleton (no attachment on the scapula).• Pectoralis major, latissiumus dorsi
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The Shoulder Anterior Deltoid and Pectoralis Major
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The Shoulder- Latissiumus Dorsi, Pectoralis Major and Deltoid, Lateral View
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The Shoulder – Posterior Muscle of the Shoulder Joint
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The Rotator Cuff Four of the muscles that act at the shoulder are commonly called
the rotator cuff. The rotator cuff’s primary stabilizing function is to hold the humeral
head in the glenoid fossa to prevent subluxation (dislocation). The muscles of the rotator cuff can be remembered using the
acronym SITS:– Supraspinatus– Infraspinatus– Teres minor– Subscapularis
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The Rotator Cuff – Anterior View
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The Rotator Cuff – Posterior View
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Coracobrachialis
Coracobrachialis
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Major Muscles That Act at the Shoulder