ANAT200 Lecture Notes - Elastic Fiber, Collagen, Apocrine
Document Summary
Skin (cutaneous membrane: epidermis (epithelium, dermis (connective tissue) Accessory structures: hair, nails, exocrine glands. Metabolic functions: vitamin d synthesis, stores energy as subcutaneous fat. Connective tissue: supports epithelium, provides strength and resiliency. Muscle: controls diameter of blood vessels, controls position of hairs. Nerve: controls smooth muscles, sensation, stimulates glands. Layers of the epidermis (from deep to superficial): Cutaneous layer gives sexy girth: stratum germinativum (basal) Attached to basal lamina: stratum spinosum spiny layer . Keratinocytes still capable of division: stratum granulosum granular layer . Secrete lipids to fill spaces between cells (water-repellent sealant) Keratinocytes die: stratum lucidum clear layer . Found in thick skin of finger tips and soles of feet: stratum corneum (corne hard or hoof-like) Melanocytes (at the basal lamina: 8% of epithelial cells, produce melanin pigment, long slender processes that insert between keratinocytes. Langerhans cell: bone marrow to epidermis, function in immune response. Merkel cell: found in basal layer, function in touch sensation.
