Trunk

Question 1

Transverse pectoral

Answer 1

Superficial

O: sternum up to rib 6

I: humerus deltoid tuberosity

Adducts forelimb

(Sits above ascending pectoral)

Question 2

Descending pectoral

Answer 2

Superficial

O: cranial sternum

I: humerus crest
Forelimb fascia

Adducts forelimb
Protraction of forelimb

Question 3

Ascending pectoral

Answer 3

Deep

O: sternum to caudal end
Lateral abdominal muscles
Cartilage of ribs 4-9

I: lesser tubercle of humerus

Adducts forelimb
Retracts forelimb

(Beneath transverse pectoral)

Question 4

Subclavicus

Answer 4

O: sternum cranial
Ribs 1-4 cartilages

I: scapula supraspinatus fossa

Forelimb retraction
Adducts forelimb

Question 5

Ilipsoas

Answer 5

Psoas major + iliacus

Lumbar TPs to lesser trochanter of femur
Cranioventral ilium to lesser trochanter of femur

Hip flexion
Forelimb protraction
Lateral rotation of femur
Back stabiliser

Question 6

Internal abdominal oblique

Answer 6

O: tuber coxae

I: last rib
Costal cartilage

Trunk rotation
Assists forced respiration

Question 7

External abdominal oblique

Answer 7

O: lateral rib surface 5-12
Thoracolumbar fascia

I: iliac crest
Tuber coxae

Trunk rotation
Defacation
Supports expiration

Question 8

Transverse abdominis

Answer 8

O: TPs lumbar

I: xiphoid cartilage sternum

Lateral trunk rotation
Supports top line

Question 9

Rectus abdominis

Answer 9

O: costal cartilage and adjacent sternum
Ribs 4-9

I: cranioventral aspect of pubis

Protraction of hindlimb
Supports trunk
Supports top line