NSE 13A/B Lecture Notes - Lecture 2: Supernumerary Nipple, Lactiferous Duct, Underarm Hair

• School: Ryerson University
• Department: Nursing
• Course: NSE 13A/B
• Professor: Wendy Garcia

Document Summary

At puberty, the estrogen hormone stimulate breast changes, the breasts enlarge: this is mostly as a result of extensive fat deposition. The duct system grows and branches, masses of solid, small cells develop at the duct endings: they are potential alveoli. Breasts develop in five stages or tanner staging: stage 1: preadolescent. Only a small elevated nipple is present: stage 2: breast bud stage. A small mound of breast and nipple develops. The areola widens: stage 3, stage 4. The nipple is flush with the breast surface. The areolar and nipple form a secondary mound over the breast: stage 5: mature breast. The areolar is flush with the breast contour (the areolar may continue as a secondary mound in some normal women). Thelarge (beginning of breast development) precedes menarche (beginning of menstruation) by about 2 years: menarche occurs during breast development stage 3 or 4, usually just after the peak of the adolescent growth spurt, approximately age 12 years.