the shoulder joint test monday
DESCRIPTION
The Shoulder Joint TEST MONDAY. Anterior Shoulder Muscles. Coracobrachialis Pectoralis Major Subscapularis Biceps Brachii. Biceps Brachii. Origin Short head: coracoid process of scapula Long head: supraglenoid tubercle of scapula Insertion Tuberosity of radius - PowerPoint PPT PresentationTRANSCRIPT
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The Shoulder Joint TEST WEDNESDAY
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Anterior Shoulder Muscles
• Coracobrachialis
• Pectoralis Major
• Subscapularis
• Biceps Brachii
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Biceps Brachii • Origin• Short head: coracoid
process of scapulaLong head: supraglenoid tubercle of scapula
• Insertion Tuberosity of radius
• Action Flexion of the elbow and shoulder, Supinates forearm
• ***the long head is the “5th rotator cuff”
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Coracobrachialis• O: Coracoid process• I: Anteromedial
surface of midshaft of humerus
• Actions: (WEAK!)– Flexion – Adduction of the
shoulder
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Pectoralis Major• Origin:
– Medial two-thirds of clavicle– Sternum
• Insertion: intertubercular groove• Actions
– Upper fibers (Clavicular)• Flexion• Horizontal Adduction
– Lower fibers (Sternal)• Internal/medial Rotation• Horizontal adduction
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Subscapularis• O: Subscapular fossa• I: Lesser tubercle and
crest of humerus• Actions:
– Internal Rotation• Stabilization • Anterior Rotator Cuff
Muscle.
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Superior Shoulder Muscles
• Deltoid
• Supraspinatus
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Deltoid• Origin
– Lateral 1/3 of clavicle (Anterior fibers)
– Acromion process (Middle fibers)– Spine of scapula
(Posterior fibers)
• Insertion – deltoid tuberosity
ActionsAnterior –FlexionMiddle – AbductionPosterior –Extension
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Supraspinatus• O: Supraspinous
fossa• I: Greater tubercle• Action:
– Abduction• Stabilization• Superior Rotator Cuff
Muscle.• Most injured rotator
cuff muscle
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Inferior Shoulder Muscles
• Latissimus Dorsi
• Teres Major
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Latissimus Dorsi• O: Spinous process of
lower 6 thorasic and all lumbar and sacral vertebrae; iliac crest
• I: Intertubercular groove
• Actions: – Adduction– Internal Rotation
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Teres Major• O: Inferior angle of
scapula• I: Intertubercular
groove• Actions:
– Adduction– Internal rotation
• “Lats little helper”
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Posterior Shoulder Muscles
• Infraspinatus
• Teres Minor
• Triceps Brachii
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Triceps Brachii • Origin
Long head: infraglenoid tubercle of scapulaLateral head: posterior surface of humerus,
Medial head: posterior surface of humerus,Insertion Olecranon process of ulna
• Action Chief extensor of elbow (long head extends the shoulder)
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Infraspinatus• O: Infraspinous fossa• I: Greater tubercle• Actions:
– External rotation
• Stabilization• Posterior Rotator Cuff Muscle• Second most commonly
injured rotator cuff muscle
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Teres Minor• O: lateral border of
scapula
• I: Greater tubercle
• Actions: – External rotation
• Stabilization
• Posterior Rotator Cuff Muscle
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Muscles of the scapula only
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Trapezius• Origin occipital bone,
nuchal ligament, and spinous processes of C7 - T12 vertebrae
• Insertion Lateral third of clavicle, acromion, and spine of scapula
• Action • superior fibers elevate, • middle fibers retract, • inferior fibers depress
scapula;
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Levator Scapula
• Origin C1 - C4 vertebrae
• Insertion Superior angle
• Action Elevates scapula
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Rhomboid major and minor
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Rhomboid major and minor• Origin
Minor: spinous processes of C7 and T1 vertebraeMajor: spinous processes of T2 - T5 vertebrae
• Insertion Medial border of scapula
• Action Retract scapula
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Serratus Anterior
• Origin the eight upper frontal ribs
• Insertion lateral border of scapula
• Action protracts scapula
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Name the muscle.
Coracobrachialis
Name the action
Flexion and Adduction of the shoulder
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Name the muscle.
Pectoralis Major
FunctionHorizontal AdductionInternal roatation
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Name the muscle.
Subscapularis
Name the action
Internal rotation of the shoulder
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Name the muscle.
Deltoid
Name the action
Abduction of shoulder (middle third)
Flexion (anterior deltoid)
Extension (posterior deltoid)
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Name the muscle.
Infraspinatus
Name the action
External rotation
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Name the muscle.
Teres Major
Name the action
Adduction of arm
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Name the muscle.
Teres Minor
Name the action if the humerus move directly to the posterior
Extension of the shoulder
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Name the muscle.
Supraspinatus
Name the action
Abduction of the shoulder
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Coracobrachialis Pect. Major
SubscapularisDeltoid
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Supraspinatus Teres Major
InfraspinatusTeres Minor