Shoulder region
description
Transcript of Shoulder region
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Shoulder region
• Bones• Joints• Muscles• Vessels & Nerves
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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
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Biceps & Triceps tendons
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A. muscles connecting scapula to humerus
1. Supraspinatus2. Infraspinatus3. Teres minor4. Subscapularis5. Teres major6. Coracobrachialis7. Deltoid
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Short muscles
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• Function:abduction
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Subscapularis
• Function: Int. rotation
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Rotator Cuff
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• 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.
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Quiz
supraspinatus
subscapularisinfraspinatus teres minor
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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
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Coracobrachialis
• Function:flex & adductthe shoulder joint
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Deltoid
• Origin:– Clavicle, scapula
• Insertion:– Deltoid tuberosity of
humerus• Actions:– Abduction– Anterior deltoid: internal
rotation– Posterior deltoid:
external rotation
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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
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B. muscles connecting trunk to scapula
1. Serratus anterior2. Levator scapula3. Rhomboid major4. Rhomboid minor5. Trapezius6. Pectoralis minor
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Serratus Anterior
• Origin:– Ribs
• Insertion:– Medial border of
scapula• Actions:– Protraction and
rotation of scapula
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Winged scapula
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Levator scapula
• Origin:– Cervical vertebrae
• Insertion:– Scapula
• Action:– Elevation of the scapula
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Rhomboid major and minor
• Origin:– Cervical and Thoracic
vertebrae• Insertion:– Scapula
• Actions:– Retraction– Elevation
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Trapezius
• Origin:– Occipital bone of skull,
cervical and thoracic vertebrae
• Insertion:– Clavicle and Scapula
• Actions:– Elevation– retraction
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Pectoralis Minor
• Origin:– Ribs
• Insertion:– Coracoid process of
scapula• Action:– Depression of scapula
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Depression of scapula
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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
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C. muscles connecting trunk to humerus
• Pectoralis major• Latissimus dorsi
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Pectoralis Major
• Origin:– Clavicle, sternum, upper
ribs• Insertion:– Crest of greater tubercle
and lat lip • Action:– Add, med rotation
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Latissimus Dorsi
• Origin:– Vertebrae, sacrum,
ilium• Insertion:– Medial lip
• Actions:– Adduction and med
rotation of humerus
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Latissimus Dorsi if humerus is fixed
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• 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.
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Shoulder Girdle Movements