HLSC 1200U Lecture Notes - Lecture 5: Stratum Lucidum, Stratum Corneum, Stratum Basale
Document Summary
Anatomy and physiology chapter 10 skin and its appendages. Major component of the body"s structural framework. Defined the internal environment of the body: self-repairing boundary between body and external environment. Body largest, thinnest and a very important organ. Size 1. 6 to 1. 8 m2 in average-sized adult. Includes: skin, hair, nails and skin glands. Reduces potential for mechanical trauma (skin is flexible) Prevent dehydration: extensive burns lose skin h2o escapes = dehydration. Protects against excess uv exposure (melanin function: damage from uv causes damage and leads to increased risk of cancer. Somatic sensory receptors: detect, pressure, touch, temperature, pain, etc. Skin is supple and elastic, thus permitting change in body contours without injury. Minor role: water and waste products (urea/ammonia/uric acid) Epidermal dendritic cells trigger helpful immune reaction working with helper t cells . Epidermis (a) epithelial tissue layer, and superficial thin no blood vessels. Dermis (b) connective tissue layer, thick & deeper contains blood vessels.
