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Chapter 5
Bones
42
Anatomy
Undergraduate 1
11/28/2010

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Term
Osteocytes
Definition
Mature Bone Cells. They maintain and monitor the protein and mineral content of the surrounding matrix.
Term
Lacunae
Definition
Osteocytes occupy small chambers called LACUNAE
Term
Canaliculi
Definition
Channels that radiate through the matrix from lacuna to lacuna and toward free surfaces and adjacent blood vessels
Term
Osteoblasts (Good)
Definition
Cells that are cuboidal in shape and found on the inner or outer surfaces of a bone... Secrete the organic components of the bone matrix
Term
Osteopregenitor Cells
Definition
Divide and differentiate to form new osteoblasts . . They produce Osteoblasts
Term
Osteoclasts (Bad)
Definition
are giant multinucleated cells. They secrete acids through exocytosis of lysosomes. The acids dissolve the bony matrix and release amino acids and the stored calcium and phosphate.
Term
Osteogenesis
Definition
responsible for the forming and production of new bone. BONE FORMATION
Term
Osteolysis
Definition
The process of erosion, increases the calcium and phosphate concentrations in body fluids.
Term
Compact Bone (Dense Bone)
Definition
Relatively dense, and solid. Forms the walls..
Term
Spongy Bone (Trabecular Bone)
Definition
Forms an open network of struts and plates. An internal layer of spongy bone surrounds the MEDULLARY (Marrow) Cavity
Term
Bone Marrow
Definition
Contained in the Medullary Cavity; a Loose connective tissue that may be dominated by ADIPOCYTES(YELLOW MARROW)
Term
Lamellea
Definition
The layers of bone in compact bone
Term
Trabeculae
Definition
The structural unit of spongy bone
Term
Osteon
Definition
The structural unit of Compact Bone
Term
Diaphysis or SHAFT
Definition
contains marrow cavity, which holds the red or yellow bone marrow. Red bone marrow is the source of producing RBCs, WBCs, and platelets.
Term
Periosteum
Definition
isolates and protects the bones from surrounding tissues, provides a route and place for attachment, participates in bone growth and repair. Attaches bone to the connective tissue of the deep fascia
Term
Intramembraneous ossification
Definition
Such as flat bones
Term
Endochondreal ossification,
Definition
such as long bones. This ossification begins with hyaline cartilage.
Term
Calcification
Definition
is the process of depositing calcium salts into tissues.
Term
Endochondral Ossification
Definition
Begins with the formation of a Hyaline Cartilage Model...
Term
Articular Cartilage
Definition
A thin cap of the original cartilage model remains exposed to the joint cavity also known as Articular Cartilage.
Term
Medullary Cavity
Definition
contains the bone marrow
Term
Primary Ossification
Definition
the first area of a bone to start ossifying. It usually appears during prenatal development in the central part of each developing bone. In long bones the primary centers occur in the diaphysis/shaft and in irregular bones the primary centers occur usually in the body of the bone
Term
Parathyroid Hormone (PTH)
Definition
acts to increase the overall availability of calcium ions in the blood. Decreased levels of blood calcium stimulates the secretion of PTH.
Increased osteoclast activity is the direct result of PTH levels.
Term
Calcitonin
Definition
is the antagonist of PTH
Term
Growth hormone and thyroxine
Definition
increase osteoblast activity leading to bone growth.
Term
Sex hormones
Definition
increase bone growth dramatically during puberty.
Term
Osteopenia
Definition
Inadequate ossification. Osteoblast activity begins to decline while osteoclast activity continues at previous levels.
Term
Osteoporosis
Definition
Characterized by reduction in bone mass and microstructural changes.
Term
Pneumatized Bones
Definition
Bones that are hollow or contain numerous air pockets such as ethmoid.
Term
irregular bones
Definition
have complex shapes with short, flat, notched, or ridged surfaces. For example the Vertebrae
Term
Short Bones
Definition
Includes Carpals and Tarsals; boxlike in appearance.
Term
Wormian Bone
Definition
develops between the sutures of cranium.
Term
External Callus
Definition
A toughened layer of connective tissue that encircles and stabilizes a bone at a fracture site.
Term
Fracture Hematoma
Definition
A large blood clot that closes off the injured vessels and leaves a fibrous meshwork in the damaged area.
Term
A Fracture
Definition
is a crack or a break in a bone. Healing of a fracture can usually occur if portions of the blood supply, endosteum, and periosteum remain in tact ..
Term
Spongy Bone is formed of ..
Definition
Struts and Plates
Term
The basic functional unit of mature compact bone is the
Definition
OSTEON
Term
What type of cell is capable of dividing to produce new osteoblasts?
Definition
Osteoprogenitor
Term
Endochondral Ossification begins with the formation of ....
Definition
A Hyaline Cartilage model
Term
When sexual hormone production increases, bone production. . .
Definition
ACCELERATES RAPIDLY
Term
The presence of an epiphyseal line indicates that ...
Definition
The epiphyseal growth has ended.
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