Size , shape & Situation

a)         Size & shape

Female breast remains in rudimentary from 
during childhood as in the male throughout
life It rapidly enlarges at thr age of puberty and
gets more developed during pregnancy & lactation 
but atropies in the old age It forms a large hemi 
spherical eminence on each side of the chest wall in
the young adult females. Size & weight of the breast 
are variableat different ages and in different individuals.

b)         Situation

It lies in the superficial fascia, because of the fact that it
is a modified sebaceous gland gland. It has no true
capsule but is unsheathed by the superficial fascia 
of the pectoral region.

c)         Extent

It extends vertically from the 2nd to the 6th rib and 
horizontally from the side of the sternum almost to 
the mid-auxiliary line opposite the 4th costal cartilage.
From the upper & outer part of the gland, a tongue-

like process, called the Axillary’s tail (of Spence), 
extends upwards by curling round the lower border 
of the Pectorals major up to the level of the 3rd rib 
in the axilla, where it comes into close relation with
 the auxiliary vessels.

d)         Relation

The deep surface of the gland is slightly concave
 with irregular outline an is separated from the deep
 fascia (pectoral fascia) covering the Pectoral is major, 
Stratus anterior and Oblique extern us abdominis by 
some quantity of loose areolas tissue which forms a 
soft cushion for the gland.