mus. (shoulder)

Question 1

deltoid

o/3

i/

Answer 1

o/

• Lateral third of clavicle
• acromion process
• Spine of scapula

i/

• Deltoid tuberocity of humerus

Question 2

deltoid

a/

ant-3

post-3

mid-1

Answer 2

a/

Anterior

• shoulder flexion,
• internal rotation,
• horizontal adduction

Posterior

• shoulder extension,
• external rotation
• horizontal abduction

Middle

• abduct shoulder

All work together and act on shoulder abduction

Question 3

pectoralis major

o/3

i/1

Answer 3

o/

• Lateral third of clavicle
• acromion process
• Spine of scapula

i/

• Lateral tip of bicipital groove

Question 4

pectoralis major

a/4

Answer 4

a/

• Internally rotate shoulder
• Adduct shoulder
• upper (flexion of shoulder)
• lower (extension of shoulder)

Question 5

pectoralis minor

o/1

i/1

Answer 5

o/

• Outer surface of rib 3,4 & 5

i/

• Coracoid process of scapula

Question 6

pectoralis minor

a/

Answer 6

a/

• (Not true action) draws scapula down and forwards
• Help adduction of scapula and downwards rotation
• • On one hand, it pulls the scapula anteriorly and inferiorly toward the ribs (abduction and depression respectively).
• This leads to a dorsomedial movement of the inferior angle of the scapula.

Question 7

supraspinatus

o/1

i/1

Answer 7

o/

• Superspinous fossa of scapula

i/

• Greater tubercle of humerus

Question 8

supraspinatus

a/1

Answer 8

a/

• Abduction of shoulder joint

Question 9

infraspinatus

o/1

i/1

Answer 9

o/

• Infraspinous fossa of scapula

i/

• Greater tubercle of humerus

Question 10

infraspinatus

a/2

Answer 10

a/

• Lateral and external rotation of shoulder
• Assists in adduction of shoulder

Question 11

teres minor

o/1

i/1

Answer 11

o/

• Upper 2/3 of lateral border of scapula

i/

• Lower facet of greater tubercle of humerus

Question 12

teres minor

a/2

Answer 12

a/

*same latissimus dorsi

Assist infraspinatus with

• lateral external rotation
• Assist adduction of shoulder

Question 13

teres major

o/2

i/2

Answer 13

o/

• Inferior angle of scapula
• Lower third of lateral border of scapula

i/

• Crest of lesser tubercle
• Medial lip of bicipital groove

Question 14

teres major

a/3

Answer 14

a/

• Extension
• medial rotation
• adduction (shoulder joint)

Question 15

latissimus dorsi

o/2 via

i/1

Answer 15

o/

• Spinous processes (T7-T12) via thoracolumbar fascia through (L1-L5 and posterior part of iliac crest)
• Lower 4 ribs

i/

• Floor of bicipital groove

Question 16

latissimus dorsi

a/

Answer 16

a/

(Same as teres major)

Assist infraspinatus with

• medial/internal rotation
• • Assist adduction of shoulder​

Question 17

trapezius

o/4

i/4

Answer 17

o/

• (Medial portion of) superior nuchal line
• External occipital protuberance
• ligamentum nuchae (covers Spinous process C1-7)
• Spinous process (all thoracic)a

i/

Upper fibres

• lateral portion of clavicle

Middle fibres

• acromion process
• spine of scapula

Lower

• root of spine of scapula

Question 18

trapezius

a/5

Answer 18

a/

Upper

• bilaterally extend head and neck
• unilaterally flex head and neck to same side and roate opposite side. Assists in elevating shoulder girdle

Middle

• retraction of scapula

Lower

• depress scapula

upper and lower together

• upwards rot. of scapular

Question 19

serratus anterior

o/1

i/1

Answer 19

o/

• (Outer surface of) 1st & 9th ribs

sup/ 1 and 2

intermed/ 2 and3

inferior/ 4 to 9

i/

(Anterior aspect/costal surface of) medial border of scapula​

Question 20

serratus anterior

a/2

Answer 20

a/

• Protract and abduct scapula
• Depression and upwardly rotating scapula