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Mammary Gland Development - Introduction to Embryology - Lecture Slides, Slides of Embryology

Mammary Glands, Ectodermal Thickenings, Appocrine Glands, Mammary Gland Development, Post-Natal Breast, Testicular Feminization Syndrome, Mesenchyme Mediated Signaling are parts of this lecture layout.

Typology: Slides

2011/2012

Uploaded on 11/22/2012

dhanesh
dhanesh 🇮🇳

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Mammary Glands
Modified appocrine glands
Milk Lines – two bands of ectodermal thickenings
Cranial to caudal -
ventrolateral body
wall
Species-specific
Supernumerary breast
polymastia
Supernumerary nipple
polythelia
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Mammary Glands

Modified appocrine glandsMilk Lines – two bands of ectodermal thickenings Cranial to caudal - ventrolateral bodywall Species-specificSupernumerary breast polymastia Supernumerary nipple polythelia

Mammary Gland Development

Week 5 - Primary bud = Thickening of epidermal cells –

from ridge Down growth into the dermisTwo Mesodermal components

Fibroblastic cells – controls branching patternFatty cells – controls shape of duct system Week 10-12 - Branching to form many secondary buds

Secondary buds lengthen and branch Ducts canalize to form lactiferous ducts

Birth – 15-25 Lactiferous ducts that open into the

Mammary pit (external opening) Mesodermal proliferation

Æ^

areola and protruding nipple

(lack of proliferation - inverted nipple)

Boysvs.Girls

Testicular FeminizationSyndrome Testosterone receptormutations Mesenchyme mediatedsignaling