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A&P - Skeletal System
Skeletal System
24
Biology
Undergraduate 2
02/05/2009

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Term
Hematopoiesis
Definition
creation of blood cells in the marrow
Term
Osteoblasts
Definition
bone-building cells (builds bones)
Term
Osteocytes
Definition
osteoblasts that's completely enclosed by the extracellular matrix (bone)
Term
Osteoclasts
Definition
bone-dissolving cells (cuts bones)
Term
long bones
Definition
Ex: femur, humerus, radius; bones with longitudal axes and expanded ends
diaphysis, epiphysis, medullary cavity
Term
diaphysis
Definition
hollow shaft of long bone; holds marrow
Term
epiphysis
Definition
knobby ends of long bones, made of cancellous bone
Term
cancellous
Definition
spongy bone; lattice
Term
short bones
Definition
ex: carpals in hand/wrist; lengths and widths usually equal
thin compact bone covering cancellous
Term
flat bones
Definition
ex: ribs, scapulae, skull; broad, with flat surfaces of compact bone covering cancellous
Term
irregular bones
Definition
ex: vertebrae, many facial bones, ear ossicles; usually connected to several other bones
Term
sesamoid bones
Definition
ex: patella; usually small and round, embedded in tendons adjacent to joints
Term
periosteum
Definition
fibrous, vascular tissue that encloses bone
Term
compact bone
Definition
has continuous extracellular matrix, packed tight, no spaces (diaphysis)
Term
spongy bone
Definition
(see cancellous); layer of compact bone on the surface, with numerous branching plates inside creating spaces
Term
endosteum
Definition
lining of the inside of the diaphysis
Term
wormian bones
Definition
unusually shaped bones found along suture lines of the skull (Named after Worm)
Term
osteon
Definition
encapsulation of a blood vessel (from the inside heading out) in the periosteum during bone building
Term
lamellae
Definition
thin layers of bone matrix encircling osteonic canals
Term
Intramembraneous bone development
Definition
takes place between two flat sheet-like layers of connective tissue, with osteoblasts turning themselves into osteocytes and ossify the extracellular matrix (ex. found in the skull in utero)
Term
Endochondral bone developement
Definition
bone born inside of cartiledge (ex. rest of the skeleton). Start off as chunks of hyaline cartiledge
Term
Epiphysial plate
Definition
growth plate
Term
Axial skeleton
Definition
bones of the head, neck and trunk - mainline
Term
Appendicular skeleton
Definition
upper and lower limbs, and those bones that attach limbs to the axial skeleton
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