Kinesiology Shoulder And Shoulder Girdle Muscle Actions (Also Origins And Insertions)

Front 1

Anterior Deltoid

Back 1

~Main Action-GHJ Flexion
~Other actions- Abduction, Horizontal Adduction, Diagonal Adduction
~O-Outer 1/3 of clavicle, top of acromion, and scapular spine
~I-Deltoid Tuberosity

Front 2

Pectoralis Major-Clavicular Portion

Back 2

~Main Action-GHJ Flexion
~Other Acitons-IR, Horizontal ADD, Diag. ADD, ABD
~O-Medial 1/2 of anterior clavicle
~I-Lateral lip of intertubercular groove

Front 3

Coracobrachialis

Back 3

Main Action-GHJ Flexion
Other Actions-Horz. ADD, Diag. ADD
~O-Coracoid process of scapula
~I-Middle of medial humeral shaft

Front 4

Biceps Brachii-Short Head

Back 4

~Main Action-GHJ Flexion
~Other Actions-ADD, Horz. ADD
~O-Coracoid process of the scapula
~I-Radial tuberosity

Front 5

Pectoralis Major-Sternal Portion

Back 5

~Main Action-GHJ Extension
~O-Anterior sternum and cartilage of 1st six ribs
~I-Lateral aspect of the intertubercular groove inf. to the head

Front 6

Latissimus Dorsi

Back 6

~Major Action-GHJ Extension
~O-Posterior crest of the ilium, sacrum, spinous proceses of the lumar vert. and lower 6 thoracic vert.
~I-medial lip of intertubercular groove of humerus

Front 7

Teres Major

Back 7

~Main Action-GHJ Extension, Internal Rotation
~Other Actions-ADD
~O-Dorsal surface of the inferior angle of scapula
~I-medial lip of intertubercular groove of humerus

Front 8

Triceps Brachii-Long head

Back 8

~Main Action-GHJ Extension
~O-infraglenoid tubercle of scapula
~I-Proximal end of olecranon process of ulna and fascia of forearm

Front 9

Posterior Deltoid

Back 9

~Main Action-GHJ Extension
~Other Actions-elbow extension, ADD
~O-Outer 1/3 of clavicle, top of acromion, and scapular spine
~I-Deltoid Tuberosity

Front 10

Middle Deltoid

Back 10

~Main Action-ABDuction
~O-Outer 1/3 of clavicle, top of acromion, and scapular spine
~I-Deltoid Tuberosity

Front 11

Supraspinatus

Back 11

~Main Action-ABDuction
~Other Actions-ER
~O-Supraspinous Fossa
~I-Greater tubercle

Front 12

ADDUCTORS

Back 12

~Latissimus dorsi
~Teres major
~Sternal Pec. Major
~Sht. head of biceps brachii
~Long head of triceps

Front 13

Subscapularis

Back 13

~Major Action-Internal Rotation
~Other Actions-ADD, Shoulder Extension
~O-Anterior surface of subscapular fossa
~I-Lesser tubercle of humerus

Front 14

Infraspinatus

Back 14

~Major Action-External Rotation
~Other Actions-Horz. ABD, Diag. ABD
~O-Medial aspect of the infraspinous fossa just below scap. spine
~I-Posterior greater tubercle of humerus

Front 15

Teres Minor

Back 15

~Major Actions-External Rotation
~Other Actions-Horz. ABD, Diag. ABD
~O-Post. on the upper and middle aspect of the lateral border of scapula
~I-Post. greater tubercle of humerus

Front 16

Horizontal ADDuctors

Back 16

~Pec. Major
~Anterior Deltoid
~Coracobrachialis

Front 17

Horizontal ABDuctors

Back 17

~Middle and Posterior Deltoid
~Infraspinatus
~Teres Minor

Front 18

Trapezius

Back 18

~Major Actions
-Sup-Elevates Scapula
-Mid-Retract Scapula
-Inf-Depress Scapula
-Sup + Inf-Superior Rotation of Scapula
~O-Medial third of superior nuchal line, external occipital protuberance, nuchal ligament, and spinous process of C7-T12 vert.
~ILateral third of clavicle, acromion, and spine of scapula

Front 19

Levator Scapulae

Back 19

~Major Actions-Elevates scapula and tilts glenoid cavity inferiorly by rotating scapula
~O-Posterior tubercles of transverse processes of C1-C4 vert.
~I-Sup. part of medial border of scapula

Front 20

Rhomboids

Back 20

~Major Actions-Retract scapula and rotate scapula to depress glenoid cavity
-fix scapula to thorcic wall

Front 21

Serratus Anterior

Back 21

Stabilize scapula