From the breasts to the arms and the back are all part of the chest
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Outside of the Chest
The sternocleidomastoid muscle, brachial biceps and brachial triceps that draw a diagonal line from the pectoralis major muscle to the collarbone and neck can be said to be the foundation of the chest.
The chest is also connected to the uterus and ovaries through the female hormones estrogen and progesterone.
Inside of the Chest
The Breast Structure is composed of the mammary glands that secrete milk and the adipose tissue that fills the surroundings, as well as the blood vessels, lymphatic vessels, and nerves that surround them.
It is placed on the top of the pectoralis major muscle in a semicircular shape. It is surrounded by blood vessels and lymphatic v essels along the mammary gland.