Extrinsic Muscle

Question 1

Superficial Pectoral

Answer 1

O: First 3 Sternebrae and fibrous raphe
I: Crest of the greater tubercle
2 Bellies: Descending + transverse

A: adduct the limb and prevent abduction when weight barring

Question 2

Deep Pectoral

Answer 2

O: Ventral Sternum, raphe and abdominal fascia
I: Lesser Tubercle of Humerus

A: WB advance and fixed + pull the trunk cranially and to extend the shoulder
I: Caudal pectoral nerves

Question 3

Brachialcephalicus

Answer 3

O: Clavicular intersection
Cleidobranchalis (i): cr. border of humerus
Cleidocephalicus (i): fibrous raphe of the neck nuchal crest of the occipital bone
Cleidomastoideus (i): mastoid

A: advance limb, extends shoulder draw head + neck to the side

Question 4

Omotransversarius

Answer 4

attachments: distal end of spine of the scapula and transverse wing of the atlas

a: advance limb + flex neck laterally (near lymph node)

Question 5

Trapezius

Answer 5

Cervical trapezius
Thoracic trapezius (supraspinous ligament from C3-T9 O)

O: Median Raphe Neck
I: spine of the scapula
a: elevate and abduct

Question 6

Latissimus Dorsi

Answer 6

O: thoracolumbar fascia
I: tere major tuberosity

A: ladiggimus: daws limb caudally and flex the shoulder

Question 7

Rhombodieus

Answer 7

O: dorsal border of scapula
i: capitis: nuchal crest of occipital bone O is also on the cranial border of the scapula
i: cervicis: median raphe of neck
i: thoracis T1-T7 spinous process