11-16-11 Integument and Mammary Glands

11-16-11 Integument and Mammary Glands - ZOL 320...

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ZOL 320 Developmental Bio November 16, 2011 Integument and Mammary Glands Epidermis and mammary gland development Cutaneous structures (hair, nails, feathers, talons) are strikingly adaptable for different environments. Also the epidermis is water impermeable (usually), tough barrier with structures which secrete substances (sweat, sebaceous, and mammary glands for instance) I. Development of the skin a. Developmental origin and anatomy a.i. Periderm is the first skin to form: Two cell layers, a bumpy thickened epidermis over a basal layer with stem cells a.i.1. Transient organ and quite permeable unlike the later mature epidermis a.i.2. Basal layer (stratum germinativum) under epidermal layer a.i.3. There are peridermis bumps within the epidermal layer a.ii. Mature skin development: a.ii.1. Stratification : Two layered with epidermis (ectoderm) over the dermis (mesoderm or NCC in head) a.ii.2. Proliferation and differentiation : Basal stem cells attached to basal lamina make an outer spinous layer of
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