Breast

 

     
The breast develops from ectodermal thickenings which extends over the ventral body wall from one limb bud to another but it persists only in the thoracic region. They form the embryonic milk ridges which may be later sites of accessory nipples or indeed breast.

The breast primordia is formed from the ectodermal thickening which has about 20 buds growing out of it. These buds branch and rebranch and from them are formed the primitive secretory units with myoepithelial cells  and duct lining cells. Their canals were initially solid but they soon break down to form hollow lactiferous ducts which elongate

The surrounding mesenchyme provides the fatty tissue in which the lactiferous ducts are eventually embedded.

The nipple is formed as depressed area that receives the terminal parts of the lactiferous ducts. But it is everted by the overgrowth of mesenchyme  lying below it. Before of puberty, male and female breast have same course of development. The areola and the rest of the female breast develops under the influence of estrogen at puberty. The areola at this stage receives a sight pigmentation, which is then further increased in pregnancy.

 

 

 

 

 

 

 

 

 

 

Oluwole Ogunranti

Practical  Gross  Museum  Scan  Malformations

 

 

 

 

 

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