No, it is not. It is the large chest muscle.
The heart is deep to the pectoralis major. That muscle is superficial to the heart.
Pectoralis major
Yes it is
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)
Pectoralis minor.
pectoralis minor and subclavius muscle.
shoulder: deltoid. Chest: Pectoralis major
major pectoralis
shoulder horizontal flexion
the shin muscle
anterior