Shoulder Girdle Muscles

Question 1

Latissimus Dorsi

Answer 1

Ant & Post
A: extends, adducts, medially rotates shoulder
O: inferior angle of scapula, spinous processes 6-12 T vertebrae, Ribs 10-12, thoracolumbar fascia, posterior iliac crest
I: intertubercular groove

Question 2

Rhomboid major

Answer 2

Post
A: retracts, elevate, downwardly rotates scapula
O: spinous processes t2-t5
I: medially border of scapula

Question 3

Rhomboid minor

Answer 3

A: retraction, elevates, downwardly rotates scapula
O: spinous processes c7-t1
I: medial border of scapula

Question 4

Levator Scapula

Answer 4

Ant
A: extends neck
Elevate, downwardly rotate scapula
Ipsilateral lateral flex & rotation of neck
O: transverse processes of c1-c4
I: upper 1/3 medial border of scapula

Question 5

Serratus Anterior

Answer 5

Post & ant
A: protraction, upwardly rotates, depress scapula
O: external surfaces of 1-9 ribs
I: ant surface of medial border of scapula

Question 6

Pectoralis major

Answer 6

Ant
A: flexion, adduction, horizontale adduction & medial rotation of g/h
O: clavicular head: medial half of clavicle, sternocostal head: sternum and cartilage of 1st-6 ribs
I: crest of greater tubercle of humerus

Question 7

Pectoralis minor

Answer 7

Ant
A: depress, protraction & downwardly rotate scapula
O: 3rd-5th ribs
I: medial of coracoid process

Question 8

Subclavius

Answer 8

Ant
A: depress clavicule & stabilizes it
Elevate 1st rib, stabilize s/c joint
O: 1st rib
I: inferior surface of middle 1/3 of clavicule

Question 9

Trapezius

Answer 9

Origins: UFT: External occipital protuberance, Superior nuchal line, ligamentum nuchae, C7 spinous process / MFT: Spinous process of C7-T3
LFT: spinous process T4-T12

I: UFT: Posterior border of lateral 1/3 of clavicle; MFT: Medial margin of acromion and spine of scapula ; LFT: Spine of scapula

A: UFT: Elevation/Upward rotation of scapula, neck extension, ipsilateral lateral flexion, contralateral rotation; MFT: Retraction of scapula; LFT:
Depression and upward rotation of scapula

Question 10

Deltoid

Answer 10

O: lateral 1/3 of clavicule, spine of scapula & acromion
I: deltoid tuberosity
A: all fibers: abduct g/h
Ant fibers: flexion, internal rotate,horizontal adduct
Middle fibers: abduct g/h
Post fibers: extension, external rotate, horizontal abduct g/h

Question 11

Supraspinatus

Answer 11

O: supraspinous fossa
I: greater tubercle of humerus
A: abduct g/h

Question 12

Infraspinatus

Answer 12

O: infraspinous fossa
I: greater tubercle of humerus
A: external rotate & adduct g/h

Question 13

Teres minor

Answer 13

O: middle 1/3 of lateral border of scapula between superior
I: greater tubercle
A: external rotate & adduct g/h

Question 14

Subscapularis

Answer 14

O: subscapular fossa
I: lesser tubercle of humerus
A: internal rotate & adduct g/h

Question 15

Teres major

Answer 15

O: inferior angle & lower 1/3 of lateral border of scapula between superior
I: crest of lesser tubercle
A: adduct, internal rotate & extend g/h

Question 16

Coracobrachialis

Answer 16

O: coracoid process of scapula
I: medial surface of mid humeral shaft
A: flex & adduct g/h

Question 17

Biceps Brachii

Answer 17

O: long head: supraglenoid tubercle
Short head: coracoid process
I: tuberosity of radius
A: flexion elbow and shoulder
Supination forearm

Question 18

Triceps Brachii

Answer 18

O: long head: infraglenoid tubercle
Lateral head: posterior proximal 1/2 humerus above radial groove
Medial head: posterior distal of humerus below radial groove
I: olecranon process & posterior proximal of ulna
A: extension of elbow
Long head: adduction & extension of shoulder