Mammary Gland and Axillary Anatomy Quiz

The mammary gland is located on the upper chest, spanning from the sternum to the mid-axillary line, and between the 2nd and 6th ribs, resting on muscles like the pectoralis major.

The mammary gland is divided into 15-20 lobes that radiate outwards from the nipple, each draining into a lactiferous sinus leading to the nipple's duct openings.

Lactiferous ducts are tubes that transport milk from the lobes of the mammary gland to the nipple.

This is a portion of the mammary gland that extends down along the pectoralis muscle, reaching up to the 3rd rib.

Fibrous connective tissue supporting the mammary gland, connecting it to the skin and holding it in place.

A network of lymphatic vessels located beneath the areola of the breast, contributing to the initial drainage of lymph from the breast tissue.

A network of lymphatic vessels located within the deep fascia of the pectoralis major muscle, playing a role in lymph drainage from the breast.

About 75% of lymph from the breast drains into the axillary lymph nodes, located in the armpit.

A group of lymph nodes located at the apex of the axilla, receiving lymph from the pectoral and upper axillary nodes.

About 25% of lymph from the breast drains into the parasternal lymph nodes, which are located alongside the internal thoracic artery.

A deep fascia covering the pectoral muscles, extending to form the floor of the axilla and deep to the clavicular head of the pectoralis major.

An extension of the pectoral fascia that forms the floor of the axilla, the space under the arm.

This fascia lies deep to the clavicular head of the pectoralis major, a key structure of the chest.

Has two heads: clavicular (from the medial half of the clavicle) and sternocostal (from the sternum, upper 6 costal cartilages, and external oblique aponeurosis).

Inserts into the lateral lip of the bicipital groove, a groove on your upper arm bone.

The Pectoralis major muscle is innervated by two nerves: the lateral pectoral nerve (branch of the lateral cord of the brachial plexus) and the medial pectoral nerve (branch of the medial cord of the brachial plexus).

The Pectoralis major muscle produces flexion, adduction, and medial rotation of the arm. The sternocostal part specifically adducts the arm from the fully abducted position (like climbing), while the clavicular part assists in flexion, adduction, and medial rotation.

The delto-pectoral groove is located between the deltoid and pectoralis major muscles and contains the cephalic vein, the deltoid branch of the thoraco-acromial artery, and delto-pectoral lymph nodes.

The clavi-pectoral fascia encloses the subclavius muscle and includes the costo-coracoid and pectoralis minor muscle fascia. It is pierced by four structures: the thoraco-acromial artery, cephalic vein, lateral pectoral nerve, and few lymph vessels.