Extrinsic Muscles of the Thoracic Limb

Question 1

Origin of the superficial pectoral

Answer 1

The first two sternebrae, and usually part of the third; the fibrous raphe between adjacent muscles

Question 2

Insertion of the superficial pectoral

Answer 2

The whole crest of the greater tubercle of the Humerus

Question 3

Origin of the deep pectoral

Answer 3

The ventral part of the sternum and fibrous raphe between fellow muscles; the deep abdominal fascia in the caudal end of the sternum

Question 4

Insertion of the deep pectoral

Answer 4

The major portion: lesser tubercle Humerus
An aponeurosis: greater tubercle and its crest
Caudal part: medial brachial fascia

Question 5

Attachment of the cleidobrachialis

Answer 5

The distal end of the cranial border of the humerus

Question 6

Attachment of the cleidocephalicus, pars cervicalis

Answer 6

Cranial half of the mid-dorsal fibrous raphe, sometimes the nuchal crest of the occipital bone

Question 7

Attachment of the cleidocephalicus, pars mastoidus

Answer 7

Mastoid part of the temporal bone with the sternomastoideus muscle

Question 8

Origin of the sternocephalicus

Answer 8

The first sternebra or manubrium

Question 9

Insertion of the sterncephalicus

Answer 9

The mastoid part of the temporal bone and the nuchal crest of the occipital bone

Question 10

Origin of the sternohyoideus

Answer 10

The first sternebra and the first costal cartilage

Question 11

Insertion of the

sternohyoideus

Answer 11

The basihyoid bone

Question 12

Origin of the sternothyroideus

Answer 12

The first costal cartilage

Question 13

Insertion of the sternothyroideus

Answer 13

The caudolateral surface of the thyroid cartilage

Question 14

Attachments of the omotransversarius

Answer 14

The distal end of the spine of the scapula; cranially, the transverse process of the atlas (C1)

Question 15

Origin of the trapezius

Answer 15

The median raphe of the neck and the supraspinous ligament from the level of the 3rd C vertebra to the level of the 9th T vertebra

Question 16

Insertion of the trapezius

Answer 16

The spine of the scapula

Question 17

Origin of the rhomboideus

Answer 17

Capitis: the nuchal crest of the occipital bone
Cervicis: the median fibrous raphe of the neck Thoracis: the spinous processes of the first 7 T vertebrae

Question 18

Insertion of the rhomboideus

Answer 18

The dorsal border and adjacent surfaces of the scapula

Question 19

Origin of the latissimus dorsi

Answer 19

The thoracolumbar fascia from the spinous processes of the L vertebrae and the last 7 or 8 T vertebrae; there is a muscular attachment to the last two or three ribs

Question 20

Insertion of the latissimus dorsi

Answer 20

The teres major tuberosity of the humerus and the teres major tendon

Question 21

Origin of the serratus ventralis cervicis and thoracis

Answer 21

The transverse processes of the last 5 C vertebrae and the first 7 or 8 ribs ventral to their middle

Question 22

Insertion of the serratus ventralis cervicis and thoracis

Answer 22

The dorsomedial 3rd of the scapula (serrated face)