Forelimb Extrinsics

Question 1

Serratus ventralis

Answer 1

O:
1) (Cervical part) transverse processes of the last 5 cervical vertebrae
2) (Thoracic part) 1st 7 or 8 ribs ventral to midline

I: dorsomedial 1/3 of scapula

A: Supports trunk and depresses scapula

Question 2

Rhomboid

Answer 2

O:
1) Nuchal crest of occipital bone
2) Median raphe
3) Spinous process of 1st 7 thoracic vertebrae

I: Dorsal border of scapula

A: Elevates FL and draws scapula to chest

Question 3

Deep pectoral

Answer 3

O: ventral sternum and xyphoid

I: greater and lesser tubercles of humerus and humeral crest

A: adducts FL and retracts shoulder

Question 4

Superficial pectoral

Answer 4

O: 1st 2 or 3 sternebrae and ventral median raphe

I: crest of greater tubercle

A: ADducts when not WB and prevents ABduction when WB

Question 5

Omotransversarius

Answer 5

O: Acromion process of scapula

I: wing of the atlas

A: laterally flexes neck and aids with drawing the FL and scapula forward

Question 6

Trapezius

Answer 6

O:
1) median raphe of neck
2) supraspinous ligament T3-9

I: spine of scapula

A: Elevates and ABducts the FL

Question 7

Latissimus dorsi

Answer 7

O: TL fascia from spinous processes of lumbar and last 7/8 thoracic vertebrae and muscular attachement to last 2/3 ribs

I: proximomedial humerus with teres major tendon

A: prime shoulder flexor and draws FL caudally (digging)

Question 8

Brachiocephalicus

Answer 8

O: clavicular tendon

I:
1) Cleidocephalicus Pars cervicalus PC- cranial 1/2 of dorsal median raphe
2) Cleidocephalicus Pars mastoidea PM- mastoid part of temporal bone
3) Cleidobrachialis- distal end of Anterior border of humerus

A: Advance the FL, Extend shoulder and draw head and neck laterally