NURS140 Lecture Notes - Lecture 2: Osteoblast, Fascia, Humerus
30 Nov 2016
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Document Summary
During injections (subcutaneous injections, intramuscular) it"s important to know how deep the needle must go: epidermis, dermis, hypodermis (subcutaneous layer) just below dermis. 1. epidermis: composed of stratified squamous epithelium (several layers of flat epithelial cells, four different cell types: Kerantinocytes: contributes to skin thickening and toughening. Subcutaneous layer: also called hypodermis or superficial fascia, stabilizes position of skin relative to underlying tissues, loose connective tissue that stores fat. Distribution of subcutaneous fat differs between sexes. Consists of: adipose tissue, major blood vessels. Due to the location of the vessels, we have terms such as: hypodermic needles, subcutaneous injections. * mammary glands categorized as a sweat gland. Structure of bone: cells of mature bone: osteocytes (mature cells) maintain bone tissue, osteoblasts immature, active cells: Found on inner and outer surfaces of a bone. Divide and differentiate to form new osteoblasts: osteoclasts are giant multi-nucleated cells: Bone matrix: made up of calcium, ground substances and fibers.
