Line 126: |
Line 126: |
| | | |
| '''''Pectoral mm.''''' | | '''''Pectoral mm.''''' |
− | *Two parts, cranial and caudal | + | *Two superficial parts, cranial and caudal |
− | *Origin: cranial sternum | + | **Origin: cranial sternum |
− | *Insertion: | + | **Insertion: |
− | **cranial ('''descending'''): crest of the humerus distal to the deltoid tuberosity | + | ***cranial ('''descending'''): crest of the humerus distal to the deltoid tuberosity |
− | **caudal ('''transverse'''): covers elbow joint to insert on the medial fascia of the forearm | + | ***caudal ('''transverse'''): covers elbow joint to insert on the medial fascia of the forearm |
− | *Action: adduct the forelimb, assist in protraction and retraction | + | **Action: adduct the forelimb, assist in protraction and retraction |
− | *Innervation: local branches of the brachial plexus | + | *One deep part ('''pectoralis profundus'''), with cranial and caudal parts |
| + | **Origin: ventral sternum and adjacent cartilage |
| + | **Insertions: |
| + | ***cranial (subclavius): supraspinatus m. |
| + | ***caudal (pectoralis ascendens): lesser tubercle of the humerus |
| + | **Actions: |
| + | ***slinging trunk between forelimbs |
| + | ***may also retract free limbs |
| + | ***draw trunk forward when limb is fixed |
| + | *Innervation: brachial plexus |
| | | |
| '''''Serratis ventralis''''' | | '''''Serratis ventralis''''' |