Download - The Shoulder Joint TEST MONDAY
The Shoulder Joint TEST WEDNESDAY
Anterior Shoulder Muscles
• Coracobrachialis• Pectoralis Major• Subscapularis• Biceps Brachii
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”
Coracobrachialis• O: Coracoid process• I: Anteromedial
surface of midshaft of humerus
• Actions: (WEAK!)– Flexion – Adduction of the
shoulder
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
Subscapularis• O: Subscapular fossa• I: Lesser tubercle and
crest of humerus• Actions:
– Internal Rotation• Stabilization • Anterior Rotator Cuff
Muscle.
Superior Shoulder Muscles• Deltoid • Supraspinatus
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
Supraspinatus• O: Supraspinous
fossa• I: Greater tubercle• Action:
– Abduction• Stabilization• Superior Rotator Cuff
Muscle.• Most injured rotator
cuff muscle
Inferior Shoulder Muscles• Latissimus Dorsi• Teres Major
Latissimus Dorsi• O: Spinous process of
lower 6 thorasic and all lumbar and sacral vertebrae; iliac crest
• I: Intertubercular groove
• Actions: – Adduction– Internal Rotation
Teres Major• O: Inferior angle of
scapula• I: Intertubercular
groove• Actions:
– Adduction– Internal rotation
• “Lats little helper”
Posterior Shoulder Muscles
• Infraspinatus• Teres Minor• Triceps Brachii
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)
Infraspinatus• O: Infraspinous fossa• I: Greater tubercle• Actions:
– External rotation• Stabilization• Posterior Rotator Cuff Muscle• Second most commonly
injured rotator cuff muscle
Teres Minor• O: lateral border of
scapula• I: Greater tubercle• Actions:
– External rotation• Stabilization• Posterior Rotator Cuff
Muscle
Muscles of the scapula only
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;
Levator Scapula• Origin C1 - C4
vertebrae • Insertion Superior
angle• Action Elevates
scapula
Rhomboid major and minor
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
Serratus Anterior• Origin the eight
upper frontal ribs• Insertion lateral
border of scapula • Action protracts
scapula
Name the muscle.
Coracobrachialis
Name the action
Flexion and Adduction of the shoulder
Name the muscle.
Pectoralis Major
FunctionHorizontal AdductionInternal roatation
Name the muscle.
Subscapularis
Name the action
Internal rotation of the shoulder
Name the muscle.
Deltoid
Name the action
Abduction of shoulder (middle third)
Flexion (anterior deltoid)
Extension (posterior deltoid)
Name the muscle.
Infraspinatus
Name the action
External rotation
Name the muscle.
Teres Major
Name the action
Adduction of arm
Name the muscle.
Teres Minor
Name the action if the humerus move directly to the posterior
Extension of the shoulder
Name the muscle.
Supraspinatus
Name the action
Abduction of the shoulder
Coracobrachialis Pect. Major
Subscapularis Deltoid
Supraspinatus Teres Major
InfraspinatusTeres Minor