Extrinsic shoulder muscles

Question 1

Trapezius- O

Answer 1

Nuchal ligament, supraspinous ligament

Question 2

Trapezius- I

Answer 2

Spine of scapula

Question 3

Trapezius- N

Answer 3

Accessory N. (CN XI)

Question 4

Trapezius- A

Answer 4

Elevate shoulder, abduct shoulder, draws limb forward, fixes shoulder

Question 5

Omotransversarius- O

Answer 5

Distal end of spine of scapula

Question 6

Omotransversarius- I

Answer 6

Transverse wing of Atlas

Question 7

Omotransversarius- N

Answer 7

Accessory N. (CN XI)

Question 8

Omotransversarius- A

Answer 8

Advance limb or flex neck laterally

Question 9

Brachiocephalicus (a. cleidobrachialis, b. cleidocephalicus)- O

Answer 9

Clavicular Intersection

Question 10

Brachiocephalicus (a. cleidobrachialis, b. cleidocephalicus)- I

Answer 10

a. Distal end of cranial border of humerus;
b. 1. Cranial 1/2 of the mid-dorsal raphe (sometimes also nuchal crest of occipital)
2. Mastoid process

Question 11

Brachiocephalicus (a. cleidobrachialis, b. cleidocephalicus)- N

Answer 11

Accessory N. (CN XI)

Question 12

Brachiocephalicus (a. cleidobrachialis, b. cleidocephalicus)- A

Answer 12

Advance the forelimb; extend the shoulder joint; draw head and neck laterally

Question 13

Latissumus dorsi- O

Answer 13

Thoracolumbar fascia

Question 14

Latissumus dorsi- I

Answer 14

Teres major tuberosity (of humerus)

Question 15

Latissumus dorsi- N

Answer 15

Thoracodorsal n.

Question 16

Latissumus dorsi- A

Answer 16

Draw free limb caudally; flex shoulder joint

Question 17

Pectoralis superficialis (superficial pectoral m.)- O

Answer 17

1st two sternebrae; fibrous raphe between adj muscl

Question 18

Pectoralis superficialis (superficial pectoral m.)- I

Answer 18

Whole crest of greater tubercle of humerus

Question 19

Pectoralis superficialis (superficial pectoral m.)- N

Answer 19

Cranial pectoral n.

Question 20

Pectoralis superficialis (superficial pectoral m.)- A

Answer 20

Adducts limbl functions to prevent abduction of limb when bearing weight

Question 21

Pectoralis profundus (deep pectoral m.)- O

Answer 21

Ventral part of sternum

Question 22

Pectoralis profundus (deep pectoral m.)- I

Answer 22

a. cranial part: lesser tubercle of humerus; an aponeurosis to the greater tubercle and its creast
b. caudal part: medial brachial fascia

Question 23

Pectoralis profundus (deep pectoral m.)- N

Answer 23

Caudal pectoral n.

Question 24

Pectoralis profundus (deep pectoral m.)- A

Answer 24

Adducts limb; when limb is advanced and fixed: pulls trunk cranially and extends shoulder; when limb is not bearing weight: draws limb caudally and flexes shoulder

Question 25

Rhomboideus (Rhomboids) (a. Rh thoracis, b. Rh cervicis, c. Rh capitis)- O

Answer 25

a. Spinous process of first 7 thoracic vert
b. Median raphe of neck
c. Occipital bone and nuchal ligament

Question 26

Rhomboideus (Rhomboids)- I

Answer 26

Dorsal border of scapula

Question 27

Rhomboideus (Rhomboids)- N

Answer 27

Ventral rami of cervical and thoracic spinal nn.

Question 28

Rhomboideus (Rhomboids)- A

Answer 28

Elevate the thoracic limb; draw scapula against trunk

Question 29

Serratus ventralis (a. S.V. thoracis, b. S.V. cervicis)- O

Answer 29

a. Transverse processes of last 1-7 (8) vertebrae

b. Ribs (C3-7)

Question 30

Serratus ventralis- I

Answer 30

Facies serrata on dorsomedial 1/3 of scapula

Question 31

Serratus ventralis- N

Answer 31

Long thoracic n.

Question 32

Serratus ventralis- A

Answer 32

Depress scapula; support trunk