A. LAB (Extrinsic Muscles FL)

Question 1

Superficial Pectoralis: Descending O+I

Answer 1

O: First sternebra
(manubrium)
I: Crest of the greater tubercule of humerus

Question 2

Superficial Pectoralis: Descending+Transverse A

Answer 2

-adduct the limb when not weight bearing
-prevent the limb from being abducted when bearing weight

Question 3

Superficial Pectoralis: Transverse O+I

Answer 3

O: First 2 or 3 sternum
I: Crest of the greater tubercule of humerus

Question 4

Deep Pectoral O+I

Answer 4

O: Ventral sternum
(deep abdominal fascia at caudal sternum)
I: -lesser tubercule of humerus
-greater tubercule of humerus
-crest of greater tubercule

Question 5

Deep Pectoral A

Answer 5

-when limb advanced and fixed: pull trunk cranially
-limb not supporting weight: draw limb caudally and flex the shoulder joint
-adduct the limb

Question 6

Brachiocephalicus O

Answer 6

Clavicular intersection

Question 7

Cleidobrachialis I

Answer 7

Distal cranial border of humerus (including crest of greater tubercule)

Question 8

Cleidocephalicus I

Answer 8

Cervical: median raphe of cranial half of neck, nuchal crest of occipital bone
(occasionally)
Mastoid: mastoid process of temporal bone

Question 9

Brachiocephalicus A

Answer 9

-advance limb
-extend shoulder joint
-draw neck and head to side

Question 10

Omotransversarius O+I

Answer 10

O: transverse process (wing) of atlas
I: distal scapular spine

Question 11

Omotransversarius A

Answer 11

-advance the limb
-flex the neck laterally

Question 12

Trapezius: cervical part O

Answer 12

-median raphe of neck

Question 13

Trapezius: thoracic part O

Answer 13

-supraspinous ligament from T3-T9

Question 14

Trapezius I

Answer 14

Distal scapular spine

Question 15

Trapezius A

Answer 15

-elevate forelimb
-abduct forelimb

Question 16

Rhomboideus: capitis O+I

Answer 16

O: Nuchal crest of occipital bone
I: Cranial dorsal border of scapula

Question 17

Rhomboideus cervicis O+I

Answer 17

O: Median raphe of neck
I: Dorsal border of scapula

Question 18

Rhomboideus: thoracis O+I

Answer 18

O: Spinous process of T1-T6 or T7
I: Dorsal border of scapular

Question 19

Rhomboideus A

Answer 19

-elevate forelimb
-draw scapula against trunk

Question 20

Serratus ventralis: Cervicis O

Answer 20

transverse processes of C3-C7

Question 21

Serratus ventralis: thoracis O

Answer 21

First 7 or 8 ribs ventral to middle

Question 22

Serratus ventralis I

Answer 22

Serrated face of scapula

Question 23

Serratus ventralis A

Answer 23

-support the trunk
-depress the scapula

Question 24

Latissimus dorsi O+I

Answer 24

O: -thoracolumbar fascia from spinous processes of lumbar and last 7 or 8 thoracic vertebrae
-last 2-3 ribs
I: Teres major tuberosity

Question 25

Latissimus dorsi A

Answer 25

-draw free limb caudally (ex. digging)
-flex the shoulder joint

Question 26

Cutaneous trunci:

Answer 26

-extends from gluteal to thoracic region and covers lateral part of trunk caudal to shoulder
-some fibers form the cranial preputial muscles in males
-some fibers form the cranial and caudal supramammary muscles in females
A: twitch the skin

Question 27

Platysma

Answer 27

-extends from mid-dorsal raphe of neck to angle of mouth
-covers much of dorsal and lateral surfaces of neck and ventrolateral surface of face
A: draw the commissure (joint between bones) of lips caudally

Question 28

frontalis

Answer 28

-lies over the frontal bone and temporalis muscles
A: protection of eye and mastication