Anatomy Chapter 7 (Bone Cells - Bone Marrow)

Bone

connective tissue that consists cells, fibers, and ground substance

bone cells

• osteogenic cells

• osteoblasts

• osteocytes

• osteoclasts

Osteogenic cells

stem cells found in endosperm, periosteum, and in central canals

Osteoblasts

bone forming cells

osteoblasts

secrete osteocalcin

Osteocytes

former osteoblasts that have become trapped in the matrix they have deposited

Lacunae

tiny cavities where osteocytes reside

Canaliculi

little channels that connect lacunae

Cytoplasmic processes

reach into the canaliculi

Osteoclasts

bone-dissolving cells found on the bone surface

ruffled border

side facing bone surface

resorption bays

pits on the surface of bone where osteoclasts

remodeling

results from combined action of the bone-dissolving osteoclasts and the bone-depositing osteoblasts

matrix of osseous tissue

by dry weight, about 1/3 organic and 2/3 inorganic

organic matter

synthesized by osteoblasts

Bone

composite material that’s a combination of ceramic and a polymer

Rickets

Disease caused by mineral deficiency and resulting in soft deformed bones

Osteogenesis Imperfecta

results from a defect in collagen disposition

Spongy Bone

• slivers of bone spincules

• thin plats of a bone called trabeculae

• spaces filled with red bone marrow

Bone Marrow

General Term for soft tissue that occupies that marrow cavity of a long bone and small spaces

Red Marrow

in nearly every bone in a child

Hemopoietic tissue

produced blood cells and composed of multiple tissues in a delicate arrangement

Yellow Bone marrow found in adults

most red marrow turns into fatty yellow marrow