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Lecture notes for Friday January 25, 2002
Outline
• The Integumentary System
• Structure
Body Cavities
=space that contains viscera (viscera = internal organs)
• Dorsal (cranial & spinal)
• Ventral (thoracic, abdomino-pelvic)
Epithelial Membranes
• Cutaneous membrane (skin)
• Mucous membranes (Mucosa)
• Serous membranes (Serosa)
Ventral cavity membranes
• Parietal (lines walls)
• Visceral (covers organs)
• Pleural membranes (lungs)
Parietal/visceral pleura
• Pericardial membranes (heart)
Parietal/visceral pericardium
• Peritoneal membranes (abdom/pelvic)
Parietal/visceral peritoneum
Integumentary System
(Skin)
• Dermatology (derm=skin)
• An organ
Structure
• Epidermis
• Dermis
• (Hypodermis=subcutaneous)
• Hypo = below, less than
Epidermis
(outer skin)
• Function: PROTECTION
• Structure: keratinized stratified squamous epithelium
Structure
• Keratinocytes
keratin
protect & waterproofing
• Melanocytes
melanin
Skin color
• Stratum basale = stratum germinativum:
Stem cells: MITOSIS
Keratinocytes
Melanocytes
• Stratum spinosum
• Stratum granulosum:
Keratiniztaion
Waterproofing & hardening
Cell contents die
• Stratum lucidum: palms & soles
• Stratum corneum:
thickness depends on location
cells continuously shed (dander)
dust mites….
barrier - water, microbes
Dermis
• Areolar connective
• Papillary layer
Dermal papillae - increase
Reticular layer
surface area
Hypodermis
• Attaches skin to underlying structures
• Areolar & adipose tissue
• Not part of the skin