Glands. – Exocrine Glands – Exocrine: secretion into a body cavity.
Integumentary system. Organization – Skin Epidermis Dermis – Accessory Structures Hair & Hair...
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Transcript of Integumentary system. Organization – Skin Epidermis Dermis – Accessory Structures Hair & Hair...
• Organization– Skin
• Epidermis• Dermis
– Accessory Structures• Hair & Hair follicles• Exocrine glands• Arrector pili• Sensory Receptors
• Functions of the Skin– Protection– Water-resistance– Temperature regulation– Vitamin D synthesis– Sensations– Immunity – Social signaling
The Dermis
• Papillary layer– Areolar CT– Contains cap’s and
sensory neurons for epidermis
– Arranged as dermal papillae
–
• Perform secretory functions
• Perform transport functions
• Maintain physical integrity
• Ciliated epithelia move materials across their surface
Specializations of epithelium
• Cells attach via cell adhesion molecules (CAM)
• Cells attach at specialized cell junctions– Tight junctions– Desmosomes– Gap junctions
Maintaining the integrity of epithelium
• Basal lamina attaches to underlying surface– Lamina lucida– Lamina densa
• Germinative cells replace short-lived epithelial cells
Structure of typical epithelium
• Number of cell layers– Simple– Stratified
• Shape of apical surface cells– Squamous– Cuboidal– Columnar
Classification of epithelia