6.7 Chapter Human Structure and Function

Three classifications of Fractures

Position of bone, Completeness of break, Whether or not bone penetrates skin

Two positions of bone in fracture(Explain)

Non Displaced: Bone retains normal position

Displaced: Bone ends out of normal alignment

Two completeness of break in fracture(Explain)

Complete fracture: Bone is broken through

Incomplete fracture: Bone is not broken through

Penetrate or not in fracture(Explain)

Open/ compound: bone ends penetrate the skin

Closed/ simple: bone ends do not penetrate the skin

4 Steps of fracture repair

Hematoma forms, Fibrocartilage callus forms, Body callus forms, Body remodeling

Hematoma forms

Hemorrhaged blood clots form hematoma at fracture site, site becomes swollen and inflamed

Fibrocartilage callus forms

Fibroblasts make collagen fibers that connect bone ends, chondroblasts secrete martix that forms fibrocartilage callus

Body callus forms

Osteoblasts transport trabeculae and form spongy bone, fibrocartilage callus replaced by immature bone that turns to bony callus

Bone remodeling occurs

Compact bone layed down, bony callus remodeled

Where does the word “skeleton” come from

Greek word meaning “dried up body” or “mummy”