HLSC 1200U Lecture Notes - Lecture 4: Determinant, Sweat Gland, Apoptosis
Document Summary
Protects against excess uv exposure (melanin function) Somatic sensory receptors: detect pressure, touch, temperature, pain, etc. Skin is supple and elastic, thus permitting change i body contours without injury. Minor role: water and waste products (urea, ammonia, uric acid) Epidermal dendritic cells trigger helpful immune reactions working with. Basement membrane, partial barrier to passage of some cells and large molecules. Layer of fat and loose fibrous connective tissue under dermis. Forms connection between skin and other structures but is not part of the skin. Sensory function, pick up and manipulate objects easier. Function: principal structural elements of outer skin. Attach to sensory nerve endings to sensory nerve going to cns. Features dead cells filled with keratin (corneocytes) Features: cells filed with keratin precursor (eleidin) 2-4 layers filled with keratohyalin granules (to form surface keratin) 8-10 layers with desmosomes that pull cells into spiny shapes. Stratum basale (base layer) or stratum germinativum (growth layer)