Attachments for

Superficial pectoral m.

Origin: Sternum

Terminations:

-crest of greater tubercle

-cranial humeral border

Actions of

Superficial Pectoral m.

Attachments for

deep pectoral m.

Origin: sternum

Terminations:

- greater, lesser tubercles of humerus

Actions of

deep pectoral m.

- adduct thoracic limb

- draw thoracic limb caudally

Attachments for

brachiocephalicus m.

Origin: clavicular intersection

Terminations:

- distal cranial humerus

- mastoid process of temporal bone

- dorsal midline of neck

Actions of

brachiocephalicus m.

- draw thoracic limb cranially and/or

- depress and pull head and neck laterally

Attachments for

omotransversarius m.

Origin: wings of atlas

Termination: distal spine of scapula

Actions of

omotransversarius m.

- pull thoracic limb cranially, and/or

depress and pull head and neck laterally

Attachments for

trapezius m.

Origins:

- cervical part: dorsal neck

- thoracic part: dorsal thorax

Termination: spine of scapula

Actions of

trapezius m.

Attachments for

rhomboideus m.

Origins:

- dorsal thorax

- dorsal neck

- occipital bone

Termination: dorsal border of scapula

Action of

rhomboideus m.

Attachments for

serratus ventralis m.

Origins:

- cervical vertebrae

-thoracic wall (ribs)

Termination: serrated face of scapula

Actions of

serratus ventralis

Attachments for

latissimus dorsi m.

Origin: thoracolumbar fascia

Termination: teres major tuberosity on medial side of proximal humerus

Actions of

latissimus dorsi m.

- Draw thoracic limb caudally

-flex humeral joint when foot is free (ie. swimming)

- extend humeral joint when foot is on ground