ANP 1106 Lecture Notes - Lecture 3: Stratum Granulosum, Stratum Corneum, Stratum Basale

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Jackie Carnegie

Document Summary

2 distinct regions: epidermis (epithelial layer- thick, keratinized strati ed squamous epithelium) and dermis (connective tissue) Lots variety of melanin, more you produce darker your skin. Papillary layer: interwoven mat of ct bers interspersed with blood vessels; dermal papillae indent overlying epidermis (super cial) Reticular layer: dense irregular ct (thick bundles of collagen bers parallel to skin surface) - source of lines of cleavage/tension lines (deep and thick) Broblasts, macrophages, some mast cells, wbcs semi- uid matrix heavily embedded with collagen, elastin & reticular. Bers richly supplied with nerve bers, blood & lymphatic vessels also hair follicles, oil & sweat glands. Dermal ridges are found only in thick skin. Together they are called friction ridges and these improve our grip and account for finger prints. Areolar ct and blood vessels and adipose tissue. Pigments contributing to skin colour give colours of yellow, rust, brown, black: skin colour dependent on type, relative amount and keratinocyte retention of the pigment.