BONE

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BONE
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Them Not-So-Dry Bones Schoolhouse Rock by
Jack Sheldon Lyrics by George Newall Bones
of heard of, but seldom seen Cept each year
round Halloween But Ive got a
shock-a-roo Right now theres a skeleton locked
up inside of you!
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Two Types of bone
Compact-makes up the shaft of the bone
Spongy-fills ends of bone and fills flat bones
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Parts of a long bone
Epiphysis-end of the bone Diaphysis-shaft of the
bone Periosteum-skin of the bone Articular
cartilage-smooth surface for joint
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Types of Bone Marrow
Red Marrow-found within the hollow spaces of the
spongy bone-makes red blood cells
Yellow Marrow-found withing the large hollow
medullary cavity in long bones, stores fat
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Bone Microanatomy
Osteon-round building block of compct
bone Central canal-large passageway in center of
osteon, blood vessels run through
them lamellae-rings of bony marix within the
osteon Canaliculi-tiny channels that
allow interaction between osteocytes
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A close up look at osteocytes
Remember, an osteocyte resides in an empty place
called a lacuna. An osteocyte is a
unspecialized, mature bone cell, found in a
lacuna. Osteocytes have small cytoplasmic
extensions that run through the canaliculi.
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Osteoblasts and Osteoclasts
Osteoblasts build new bone cells, turn into
osteocytes when surrounded by new
bone. Osteoclasts break down bone. Skeletal
remodeling-new bone is made as fast as old bone
is broken down Osteporosis-bone is broken down
too fast for osteoblasts to keep up
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Thats all for now soon well start on the