Pectoralis Major
How-To: To view the pectoralis major, you must cut away a large amount of superficial muscle and connective tissue. While it is possible to do just by wiggling around the blunt probe and using your fingers, you should be careful not to cut or damage any muscles under the pectoralis.
Follow our picture step-by-step guide: using the blunt probe to find wholes, ripping the connective tissue, and finally isolating the muscle.
Follow our picture step-by-step guide: using the blunt probe to find wholes, ripping the connective tissue, and finally isolating the muscle.
- Action: This muscle adducts and retracts the forelimb, or moves the forelimb in and out.
- Origin: Originates from the sternum.
- Insertion: Inserts along the humerus of the foreleg.
Once you have made an opening under the pectoralis on one side, dig around to the other side and see if you can rip out some connective tissue to create a cavity you can put the probe into.
The bottom-right picture has the blunt probe isolating the pectoralis major, lifting it up. It connects the chest and the side of the arm.