Muscles O/I/A - Upper Extremity (Shoulder)

Question 1

Pectoralis Major

Answer 1

O: Medial 1/3 of Clavicle, Sternum, Costal Cartilage of upper 6 Ribs

I: Lateral lip of bicipital groove to the crest of the greater tubercle of the humerus

A: Adduction, internal rotation, horizontal adduction, flexion 1st 60 degrees and first 60 degrees of extension from flexion 180

Question 2

Pectoralis Minor

Answer 2

O: Anterior surface of ribs 3-5

I: Coracoid process of scapula

A: Scapular Depression, Protraction, and downward Rotation and tilt

Question 3

Rhomboids

Answer 3

O: Spinous Processes of C7 - T5

I: Medial border (Scapula) between spine & inferior angle

A: Scapular Retraction, Elevation, and downward Rotation

Question 4

Upper Trapezius

Answer 4

O: Occipital bone, nuchal ligament on upper cervical spinous processes

I: Outer 1/3 of clavicle, Acromion Process

A: Scapular Elevation and Upward Rotation

Question 5

Middle Trapezius

Answer 5

O: Spinous Process of C7 - T3

I: Scapular Spine

A: Scapular Retraction

Question 6

Lower Trapezius

Answer 6

O: Spinous Processes of middle and lower thoracic vertebra

I: Base of Scapular Spine

A: Scapular Depression and upward Rotation

Question 7

Latissimus Dorsi

Answer 7

O: Spinous Processes of T7 - L5, Posterior surface of Sacrum, Iliac Crest, and lower 3 Ribs

I: Medial lip of bicipital groove of the Humerus

A: Shoulder Extension, Adduction, Internal Rotation, Hyperextension

Question 8

Teres Major

Answer 8

O: Lateral border of scapula near inferior angle

I: Crest below Lesser Tubercle inferior to the latissimus dorsi attachment

A: Shoulder Extension, Adduction, Internal Rotation

Question 9

Teres Minor

Answer 9

O: Lateral border of scapula

I: Greater Tubercle of Humerus

A: Shoulder External Rotation, Horizontal Abduction

Question 10

Supraspinatus

Answer 10

O: Supraspinous Fossa (Scapula)

I: Greater Tubercle (Humerus)

A: Shoulder Abduction

Question 11

Infraspinatus

Answer 11

O: Infraspinous Fossa (Scapula)

I: Greater Tubercle (Humerus)

A: Shoulder External Rotation, Horizontal Abduction

Question 12

Subscapularis

Answer 12

O: Subscapular Fossa (Scapula)

I: Lesser Tubercle (Humerus)

A: Shoulder lnternal Rotation

Question 13

Levator Scapula

Answer 13

O: Transverse processes of first 4 cervical vertebra

I: Medial border (Scapula) between superior angle & spine

A: Scapular Elevation and downward Rotation

Question 14

Coracobrachialis

Answer 14

O: Coracoid Process (Scapula)

I: Medial surface of Humerus near the midpoint

A: Stabilizes shoulder joint

Question 15

Serratus Anterior

Answer 15

O: Lateral surface of upper 8 Ribs

I: Medial border (Scapula), anterior surface

A: Scapular Protraction and upward Rotation

Question 16

Anterior Deltoid

Answer 16

O: Lateral 1/3 of Clavicle

I: Deltoid Tuberosity (Humerus)

A: Shoulder Abduction, Flexion, Internal Rotation, Horizontal Adduction

Question 17

Middle Detoid

Answer 17

O: Acromion Process (Scapula)

I: Deltoid Tuberosity (Humerus)

A: Shoulder Abduction

Question 18

Posterior Deltoid

Answer 18

O: Spine of Scapula

I: Deltoid Tuberosity (Humerus)

A: Shoulder Abduction, Extension, Hyperextension, External Rotation, Horizontal abduction