Breast

Question 1

Location

Answer 1

Extends from the 2nd to 6th-7th Rib and from the sternum to the axilla

Roughly 2/3 lies on the pectoralis major and 1/3 on serratus anterior

Confined to the superficial fascia and, except during pregnancy, consist mostly of fat

Question 2

General Structure

Answer 2

Nipple- may be inverted, flat, or projected outward

Has 15-25 ducts, one from each lobule which open separartely

Areola- Contains many sebaceous glands and CT between lobules send bundles out to skin as suspensory ligaments (Ligaments of Cooper)

Lactiferous Ducts

Question 3

Blood Supply

Answer 3

Anterior perforating branches of the internal toracic artery

Perforating branches from intercostal arteries

Pectoral branches from thoracoacromial trunk

Lateral thoracic branch of te axillary artery

Question 4

Lymph Drainage

Answer 4

About 3/4 of lymphatic drainage to the axillary nodes

Medially to internal thoracic nodes or to opposite breast

Down to abdomen and subperitoneal lymphatics