The titties are covered by skin; each tittie has one nipple surrounded
by the areola. The areola is colored from pink to dark brown,
hairless, and has several sebaceous glands. The larger mammary
glands within the tittie produce the milk; they consist of several
lobules, and each tittie has some 10-20 lactiferous ducts that
drain milk from the lobules to the nipple, where each duct has
its own opening,
Most of the tittie is connective tissue, i.e.,
adipose tissue (fat) and Cooper's ligaments. The titties sit over
the pectoralis major muscle and usually extend from the level
of the 2nd rib to the level of the 6th rib anteriorly. The superior
lateral quadrant of the tittie extends diagonally upwards in an
'axillary tail'. A thin layer of mammary tissue extends from the
clavicle above to the seventh or eighth ribs below and from the
midline to the edge of the latissimus dorsi posteriorly.
The arterial blood supply to the titties is derived
from the internal thoracic artery (previously referred to as the
internal mammary artery), lateral thoracic artery, thoracoacromial
artery, and posterior intercostal arteries. The venous drainage
of the tittie is mainly to the axillary vein, but there is some
drainage to the internal thoracic vein and the intercostal veins.
The tittie is innervated by the anterior and
lateral cutaneous branches of the 4th through 6th intercostal
nerves. The nipple is supplied by the T4 dermatome.
Both sexes have a large concentration of blood
vessels and nerves in their nipples.