The%20Shoulder%20Joint

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The Shoulder Joint
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Muscles of the Shoulder Joint

• Chapter 5

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Anterior Shoulder Muscles

• Coracobrachialis
• Pectoralis Major
• Subscapularis

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Coracobrachialis

• O Coracoid process
• I Anteromedial surface of midshaft of humerus
• Actions
• Flexion
• Adduction of the shoulder
• Horizontal Adduction

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Pectoralis Major

• Origin
• Medial two-thirds of clavicle
• Sternum
• Insertion intertubercular groove
• Actions
• Upper fibers (Clavicular)
• Internal rotation
• Horizontal Adduction
• Flexion
• Adduction
• Lower fibers (Sternal)
• Internal Rotation
• Horizontal adduction
• Extension
• Adduction

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Subscapularis

• O Subscapular fossa
• I Lesser tubercle and crest of humerus
• Actions
• Internal Rotation
• Adduction
• Extension
• 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

Actions Anterior Abduction, Flexion, Horizontal
adduction, Internal rotation. Middle
Abduction Posterior Abduction, Extension,
Horizontal abduction, External rotation
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Supraspinatus

• O Supraspinous fossa
• I Greater tubercle
• Action
• Abduction
• Stabilization
• Superior Rotator Cuff Muscle.
• Most injuired 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
• Extension
• Internal Rotation
• Horizontal Abduction

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Teres Major

• O Inferior angle of scapula
• I Intertubercular groove
• Actions
• Extension
• Adduction
• Internal rotation
• Lats little helper

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Posterior Shoulder Muscles

• Infraspinatus
• Teres Minor

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Infraspinatus

• O Infraspinous fossa
• I Greater tubercle
• Actions
• External rotation
• Horizontal abduction
• Extension
• Stabilization
• Posterior Rotator Cuff Muscle
• Second most commonly injured rotator cuff muscle

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Teres Minor

• O Upper 2/3 of lateral border of scapula
• I Greater tubercle
• Actions
• External rotation
• Horizontal abduction
• Extension
• Stabilization
• Posterior Rotator Cuff Muscle

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Study guide

• List the muscles for Horizontal Adduction

• Name the muscles for Horizontal Abduction

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Practice

• List the muscles that do flexion of the shoulder

• List the muscles that do extension of the
  shoulder

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Practice

• List the muscles that do adduction of the shoulder

• List the muscles that do abduction of the
  shoulder

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Practice

• List the muscles that do internal rotation of the
  shoulder

• List the muscles that do external rotation of the
  shoulder

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Name the muscle.
Coracobrachialis
Name the action
Adduction of the shoulder
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Name the muscle.
Pectoralis Major
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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
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Name the muscle.
Infraspinatus
Name the action
External rotation
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Name the action
Name the muscle.
Adduction of scapula
Teres Major
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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
Subscapularis
Deltoid
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Supraspinatus
Teres Major
Infraspinatus
Teres Minor