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Classifications of muscles that move the shoulder
• A. muscles connecting scapula to humerus• B. muscles connecting trunk to scapula• C. muscles connecting trunk to humerus
A. muscles connecting scapula to humerus
1. Supraspinatus2. Infraspinatus3. Teres minor4. Subscapularis5. Teres major6. Coracobrachialis7. Deltoid
• Rotator cuff function:
• only 25% of the humeral head is in contact with the glenoid fossa.
• The rotator cuff muscles compress and depress the humeral head within the glenoid fossa.
Teres major• Function:
adduction of humerusmed rotator
• Why medial?
• Origin:– Inf angle of scapula
• Insertion:– Med lip of groove
• Actions:– Internal rotation and
adduction of arm
Deltoid
• Origin:– Clavicle, scapula
• Insertion:– Deltoid tuberosity of
humerus
• Actions:– Abduction– Anterior deltoid: internal
rotation– Posterior deltoid:
external rotation
Classifications of muscles that move the shoulder
• A. muscles connecting scapula to humerus• B. muscles connecting trunk to scapula• C. muscles connecting trunk to humerus
B. muscles connecting trunk to scapula
1. Serratus anterior2. Levator scapula3. Rhomboid major4. Rhomboid minor5. Trapezius6. Pectoralis minor
Serratus Anterior
• Origin:– Ribs
• Insertion:– Medial border of
scapula
• Actions:– Protraction and
rotation of scapula
Levator scapula
• Origin:– Cervical vertebrae
• Insertion:– Scapula
• Action:– Elevation of the scapula
Rhomboid major and minor
• Origin:– Cervical and Thoracic
vertebrae
• Insertion:– Scapula
• Actions:– Retraction– Elevation
Trapezius
• Origin:– Occipital bone of skull,
cervical and thoracic vertebrae
• Insertion:– Clavicle and Scapula
• Actions:– Elevation– retraction
Pectoralis Minor
• Origin:– Ribs
• Insertion:– Coracoid process of
scapula
• Action:– Depression of scapula
Classifications of muscles that move the shoulder
• A. muscles connecting scapula to humerus• B. muscles connecting trunk to scapula• C. muscles connecting trunk to humerus
Pectoralis Major
• Origin:– Clavicle, sternum, upper
ribs
• Insertion:– Crest of greater tubercle
and lat lip
• Action:– Add, med rotation
Latissimus Dorsi
• Origin:– Vertebrae, sacrum,
ilium
• Insertion:– Medial lip
• Actions:– Adduction and med
rotation of humerus
• Covering th front and back of the trunk.• The pectoralis major and latissimus dorsi both adduct and medially rotate the
Humerus.• Lower edge of the pectoralis major muscle on rib 7 = upper edge of the latissimus dorsi
on vertebra T7.