the skeletal system

Terms in this set (28)

what is the bone function ?

-support soft tissues
-protect vital organs
-store calcium&lipids
-manufacture blood cells
-serves as levers for the muscular system

what is an osteon?

basic structural unit on the bone (supportive column)

what is a central canal?

canals that run lengthwise through the bone containing blood vessels which supply nutrients and oxygen

what is the concentric lamellae?

rings of calcified matrix

what are osteocytes ?

mature bone cells within small spaces called lucunae

what is trabeculae?

meshwork of bony struts filled with marrow

dense bone that forms the external portion of all bones

inner layer of bone with spaces filled with bone marrow

spongy-like material in the cavity of bones that function to produce blood cells(red) or store lipids(yellow)

shaft or long, main, cylindrical portion of the bone

extremities or ends of each bone (where bone marrow is formed)

tough, fibrous membrane that surrounds the bone

greater in length than in width
ex. humerous of arm

almost as wide as they are long
ex. carpals of wrist

thin, platelike
ex. parietal bone of skull

irregular bones

shapes that would not fit in any other categories
ex. vertebrae

how many named bones are in the human body ?

Two Bone Groups , what are they?

Axial and Appendicular

what is the axial skeleton composed of ?

80 bones including the skull, vertebrae, sternum, ribs, and hybrid bones

what is it's function?

central framework for attachment, protection of internal organs

what is the appendicular skeleton composed of ?

126 bones including the pectoral girdles plus upper limbs and the pelvic girdles plus lower limbs

what is its function?

allows the body to move and manipulate objects

what is interstitial lamellae?

lines medullary cavity

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