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47 Cards in this Set

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  • Back


Shaft of long bone

Medullary Cavity

Marrow cavity of bone


Two ends of long bone

Spongy Bone

Covered by more durable compact bone. Found in the end of long bones and the middle of others.

Articular Cartilage

Thing layer of hyaline cartilage that covers the joint surface where one bone meets another. Provides frictionless surface for bones to adjoin to one another.


Covers bone except where articular cartilage is. Connective tissue membrane. Diaphysis is covered by this.


Thin layer of reticular connective tissue lining the marrow cavity

Epiphyseal Plate

Area of hyaline cartilage that separates the marrow spaces of the epiphysis and diaphysis. Enables growth in length.

Epiphyseal Line

A bone scar that marks where growth plate used to be.


Bone forming cells


former osteoblasts that have become trapped within the bony tissue they produce. Nourish bone


Bone destroying. Secretes a substance that dissolves bones.

Resorption Bays

Pits on surface of bone where osteoclasts are found.


Results from combined action of the bones and dissolving osteoclasts and the bone forming osteoblasts


The basic structural unit of compound bone.


Cylinder of tissue around a central canal

Perforating Canal

Transverse or diagonal passage ways along the length of the osteon.

Collagen protein fibers

adds to flexibility of bones. Provides extra strength.

Central Canal

At the center of each osteon. Contains nerve and blood cells.

Red bone marrow

Where hemopoiesis occurs. Found in the spongy center of most bones. Where red and white blood cells and platelets are made.

Yellow bone marrow

Interior of diaphysis. Fatty. No longer produces blood.

Intramembranous Ossification

Produces the flat bones of the skull and most of the clavicle. Takes place when osteoblasts migrate into membranes and form clusters called ossification centers.

Endochondrial Ossification

Occurs in long bones. Blood vessels grow into center of rod of hyaline cartilage. Osteoblasts develop within the membrane. Interior remains hollow.

Primary Marrow Cavity

Forms from blood and stem cells filling the hollow cavity.

Secondary Ossification Center

Forms by Chrondrocyte

Interstitial Growth

Bones increase in length. Bone elongation is a result of cartilage growth within the Epiphyseal plate.

Appositional Growth

Bones increase in width throughout life.

Bone Remodeling

Occurs throughout life. 10% per year. Repairs micro fractures, releases minerals into blood, reshapes bones in response to use and disuse


Blood calcium defiency. Causes excess excitability of muscle, tremors, spasms and tetany.


Blood calcium excess. sodium channels less responsive. sluggish


A form of vitamin D Produced by the action of the skin, liver, and kidney.


Secreted by c cells of the thyroid gland when calcium concentration rises too high.


A thin plate or layer of tissue.


A little plate


A small cavity or depression in a tissues such as bone, cartilage, and the erectile tissue


A cartilage cells. A former chondroblast that has become enclosed in a lacunae in the cartilage matrix


A mass of clotted blood in the issues, forms a bruise when visible though the skin


the most common bone disease marked loss of bone density. Affects spongy bone the most.

Parathyroid Hormone

Found on the posterior surface of thyroid gland. Released when calcium blood levels are low. Raises level of calcium in the blood.

Stress Fracture

Break caused by application of excessive force to a bone.

Pathological Fracture

Break in a bone weakened by some other disease.

Spiral/Transverse Fracture

Direction of the fracture line


Break in the skin

Cominuted Fracture

Multiple Pieces

Granulation Tissue

Soft fibrous mass produced by capillary and cellular invasion . 48 hours after injury


Thin layer of reticular connective tissue lines the internal marrow cavity, covers all the honeycombed surfaces of spongy bone and lines canal system in compact bone.

Osteogenic Cells

Stem cells that develop from embryonic mesenchymal cells. Found in endosteum.