Adductors
There are actually four muscles which make up the shoulder adductors. These muscles include the Pectoralis Major, Coracobrachialis, Latissimus Dorsi, and Teres Major.
The pectoralis major and deltoid muscles are both abductors, therefore they act synergistically to pull the arms inward toward the mid-line (in this case the chest) of the body.
It is the middle deltoidIt is the Deltoid Muscle .
In clams, it's used to open and close the shell.
calf muscles and arm muscles adductors abductors
pectoralis major and pectoralis minor
The heart is deep to the pectoralis major. The pectoralis major is superficial to the heart.
there are two muscles with pectoralis in their name, Pectoralis Major and Pectoralis Minor. Pectoralis Major is the main muscle of the chest and pectoralis minor is deep to it (so you can't feel it because pectoralis major completely covers it)
No they are not
The pectoralis major is a third class lever.
Pectoralis minor.
The heart is deep to the pectoralis major. That muscle is superficial to the heart.