Muscles of the Brachial Synsarcosis

Question 1

Origin of trapezius

Answer 1

Cervical: mid-dorsal aponeurosis
Thoracic: dorsal spines of thoracic vertebrae

Question 2

Insertion of trapezius

Answer 2

Spine of scapula

Question 3

Action of cervical trapezius

Answer 3

retraction

Question 4

Action of thoracic trapezius

Answer 4

protraction of forelimb and elevation of shoulder

Question 5

Innervation of trapezius

Answer 5

Cranial nerve XI (Spinal accessory nerve)

Question 6

Blood supply of trapezius

Answer 6

Subscapular artery

Question 7

Origin of brachiocephalicus

Answer 7

clavicular intersection

Question 8

Insertion of brachiocephalicus

Answer 8

neck and skull and the humerus

Question 9

Action of brachiocephalicus

Answer 9

protraction and moves neck laterally

Question 10

Innervation of brachiocephalicus

Answer 10

Cranial nerve XI (Spinal accessory) and axillary

Question 11

Origin of omotransversarius

Answer 11

Wing of the atlas

Question 12

Insertion of omotransversarius

Answer 12

Distal scapular spine (horses) or acromion

Question 13

Innervation of omotransversarius

Answer 13

cranial nerve XI (spinal accessory) and cervical

Question 14

Action of omotransversarius

Answer 14

protraction

Question 15

Omotransversarius in cows is…

Answer 15

indistinct (rudimentary)

Question 16

Omotransversarius in horses is…

Answer 16

fused with brachiocephalicus (no acromion)

Question 17

Origin of lat dorsi

Answer 17

thoracolumbar fascia (continuous with fascia)

Question 18

Insertion of lat dorsi

Answer 18

humerus on the teres major tubercle

Question 19

Action of lat dorsi

Answer 19

retraction and flexion of the shoulder (flexion because it crosses over the shoulder)

Question 20

Innervation of lat dorsi

Answer 20

thoracodorsal

Question 21

Blood supply of lat dorsi

Answer 21

Thoracodorsal

Question 22

Origin of pectoralis

Answer 22

Sternum

Question 23

Insertion of pectoralis

Answer 23

tubercles of the cranial humerus

Question 24

Innervation of pectoralis

Answer 24

pectoral and lateral thoracic

Question 25

Blood supply of pectoralis

Answer 25

pectoral

Question 26

Action of pectoralis

Answer 26

both superficial and deep: adduction; superficial: extend shoulder; deep: flex shoulder

Question 27

Origin of rhomboideus

Answer 27

R capitus (carnivores only): nuchal crest; R cervicis and R thoracis: dorsal neck and thorax, respectively

Question 28

Insertion of rhomboideus

Answer 28

dorsal scapula and cartilage

Question 29

Innervation of rhomboideus

Answer 29

Dorsal cervical and thoracic spinal nerves

Question 30

Blood supply of rhomboideus

Answer 30

arteries in neck

Question 31

Action of rhomboideus

Answer 31

retraction

Question 32

Origin of thoracic serratus ventralis

Answer 32

ribs

Question 33

Origin of cervical serratus ventralis

Answer 33

cervical transverse processes

Question 34

Insertion of serratus ventralis

Answer 34

Subscapular fossa specifically the facies serrata

Question 35

Innervation of serratus ventralis

Answer 35

Long thoracic

Question 36

Blood supply of serratus ventralis

Answer 36

various collaterals

Question 37

Action of serratus ventralis

Answer 37

bears weight, shifts weight, raises thorax, protracts (thoracic) and retracts (cervical)

Question 38

Cervical serratus ventralis (protracts or retracts)

Answer 38

retracts

Question 39

Thoracic serratus ventralis (protracts or retracts)

Answer 39

protracts

Question 40

What animal is the subclavius found in in this course

Answer 40

horses only

Question 41

Origin of subclavius

Answer 41

sternum and costal cartilage

Question 42

Insertion of subclavius

Answer 42

supraspinatus and shoulder fascia

Question 43

Action of subclavius

Answer 43

retracts

Question 44

Innervation of subclavius

Answer 44

pectoral

Question 45

What muscle prevents adduction

Answer 45

rhomboids

Question 46

what muscle prevents abduction

Answer 46

pectorals