Breast Disorders Flashcards
(104 cards)
3 components of the female breast
- Glands and ducts (organized
- into lobes)
- Stroma (fibrous tissue) to bind lobes together
- Adipose tissue within and between lobes
each breast is made up of how many lobes?
12-20 lobes
which part of the breast contains major excretory duct for the lobe
apex of the breast
Each lobe has a group of lobules that have several ducts which unite to form the ?
major duct for the lobe
Each major duct widens to form ____ and then narrows at its individual opening in the nipple
an ampulla
Areola also contains sebaceous glands (______ ______) which may be visible as punctate prominences
Montgomery glands
what % of a normla breast is composed of adipose tissue?
80-85%
difference in breast in Nonpregnant, nonlactating; pregnant; lactation
- Nonpregnant, nonlactating - small, tightly packed alveoli
- Pregnant - alveoli hypertrophy and lining cells proliferate
- Lactation - alveolar cells secrete lipids and proteins (milk)
Deep surface of breast lies on what structure
fascia of chest wall muscles
Fascia is condensed into multiple bands - _____ _____ - support breast in upright position
Cooper’s ligaments
lymphatic drainage Ultimately drains into where?
axillary lymph nodes
receive most lymphatic drainage and therefore are the most common site of breast cancer metastases
AXillary nodes - sentinel nodes
alt pathways of lymphatic drainage
internal mammary, supraclavicular, epitrochlear, contralateral axillary and abdominal lymph nodes
development of fetal nipple and prepubertal breast?
- Fetal - Primordial breast arises from basal layer of epidermis
- Prepubertal - breast is rudimentary bud
- Few branching ducts
- Ducts are capped with alveolar buds, end buds, or small lobules
at what age do the breast begin to grow?
what hormone affects breast tissue?
age 10-13
- estrogen/progesterone affect breast tissue
- Communication between epithelial and mesenchymal cells
- Extensive branching of ductal system and lobule development
what structures change during overall breast growth
increased:
- acinar tissue
- ductal size & branching
- adipose
Premenstrual - breast epithelial cells proliferate during the _____ phase when estrogen and progesterone are increased
what other changes happen?
luteal
- Acinar cells increase in number and size
- Ductal lumens widen
- Overall increased breast size, turgor/fullness, and tenderness - 1 week before menses
Postmenstrual - breast epithelial cells undergo _______ at the end of the luteal phase when estrogen and progesterone levels decline
what other changes happen?
programmed cell death
- Decreased size and turgor (may still be tender)
- Reduced number and size of breast acini
- Decreased diameter of ducts
Final breast tissue differentiation occurs under the influence of _____ and _____ and is not complete until first full-term pregnancy
progesterone
prolactin
changes to the breast during pregnancy
- Marked increase in breast size and turgidity
- Deepening pigmentation of the nipple-areolar complex
- Nipple enlargement
- Areolar widening with increased number and size of lubricating glands
- Branching and widening of breast ducts
- Increased acini
changes to breast during late pregnancy (~34 wks)
fatty tissues are almost completely replaced by cellular breast parenchyma
Drop in what hormone triggers onset of milk production
progesterone
what is main regulator of milk production
Prolactin
menopausal changes to breast?
Decrease in estrogen and progesterone
- atrophy and involution
- Decr # and size of ducts and acini
- regresses to almost infantile state
- Adipose tissue may or may not atrophy
- Parenchymal elements are lost