Outline of human sexuality. Approximately two years after the onset of puberty a girl's first menstrual cycleestrogen and growth hormone stimulate the development and growth of the glandular fat and suspensory tissues that compose the breast. Galactocele Breast cyst Breast hematoma Breast lump Pseudoangiomatous stromal hyperplasia. The T-4 nerve Thoracic spinal nerve 4which innervates the dermatomic areasupplies sensation to the nipple-areola complex.
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Mother’s milk: The amazing science of breast milk
Sensation in the science of breast breast is provided by the peripheral nervous system innervation by means of the front anterior and side lateral cutaneous branches of the fourth- fifth- and sixth intercostal nerves. Some women's breasts have varying proportions of glandular tissue than of adipose or connective tissues. Benign mammary dysplasia Duct ectasia of breast Chronic cystic mastitis Mammoplasia Gynecomastia Adipomastia lipomastia, pseudogynecomastia Breast hypertrophy Breast atrophy Micromastia Amastia Anisomastia Breast engorgement. These glands secrete oily fluid that lubricate and protect the nipple during breastfeeding.
At the sides of the chest, the breast tissue can extend into the axilla armpitand can reach as far to the back as the latissimus dorsi muscleextending from the lower back to the humerus bone the longest bone of the upper arm. For pubescent girls in thelarche the breast-development stagethe female sex hormones principally estrogens in conjunction with growth hormone promote the sprouting, growth, and development of the the science of breast. Sexual Behavior in the Human Female. A few women can the science of breast experience orgasm from breast stimulation alone. While it has been a common belief that breastfeeding causes breasts to sag,  researchers have found that a woman's breasts sag due to four key factors: