BMS 300 Lecture Notes - Lecture 14: Periosteum, Melanin, Bone Marrow
Document Summary
Skin and bone: skin structure, epidermis, dermis, melanocyte function, generate pigment. Bone as an organ: connective tissue of osteocytes, secretion of collagen and hydroxyapatite, innervated, vascularized. Long bone structure: epiphysis, diaphysis, articular surfaces, spongy bone, trabecular bone, osteons of compact bone. Bone growth: chondrocytes at growth plate, cartilage. Bone remodeling: osteocytes/osteoblasts, bone formation, osteoclasts, bone destruction, hormonal control, osteoclasts regulate calcium levels in blood. Stratum basale is on the bottom (next to basal lamina) *the stratum basale and stratum spinosum are alive because they are closest to the basal lamina. Henna is a dye that is taken up by keratin in the keratinocytes but disappear because things are turned over. Tattoo needles sick all the way through the epidermis in the dermis where things are not turned over. Ultraviolet light would penetrate into the layers of our ancestors. *this is why melanin was developed to have a barrier to keep the folate alive.
