2 Nov 2021
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Document Summary
Runs vertically at the posterolateral aspect of the body of sternum. Internal thoracic a. is a branch from the subclavian a. When you are tired, you subconsciously fix the position of your arms (by putting it on your hips, knees or on a table) and this helps to expand the thoracic cage allow more air to get in. The coverings of thoracic cage include: subcutaneous fat, superficial fascia: anchors fat and skin, skin: contains: sweat glands, fat, blood and lymphatic vessels and nerves, also contains the mammary gland (or breast). Mammary gland sits on the fascia superficial to pectoralis major m: space between the pectoralis major m. and the mammary gland is called retromammary space. Breast also has an areola pigmented area around nipple: contains sebaceous glands for lubrication important for breast feeding. Medial side of breast is supplied by medial mammary branches from internal thoracic a.
