Bone Tissue Flashcards
cartilage and bone are both what kinds of tissue?
connective tissue
is bone vascular or avascular?
VASCULAR
what are some major functions of the bone?
structure of body, storage and release of calcium and phosphate ions and blood cell formation (hematopoiesis).
What is bone composed of?
inorganic salts (65-70%, main component): Calcium hydroxyapatite. ground substance (30-35%) organic component: PG and type 1 collagen (which makes up 90% of GS).
What are two types of bone?
- lamellar: mature bone, it is compact outside of bones and cancellous or spongy trabeculae inside the bones, forms a meshwork.
- Woven: only in fetus and during bone repair.
Define epiphysis, metaphysis and diaphysis
epiphysis: end part of long bone
metaphysis: growing part of long bone located between epiphysis and diaphysis
diaphysis: shaft or central part of long bone.
what layer in bone is similar to the perichondrium found in cartilage?
periosteum, immature cells are also found here just like in cartilage but now are called osetoblasts.
What is the formation of compact bone?
organized into osteons or haversian systems
What is the mature cell type in bone?
osteocytes.
connective tissue is attached to bone by what kind of fibres?
Sharpeys
Haversian canal or central canal runs in what direction? and is located where?
runs in vertical direction and runs up through center of osteon in compact bone.
What are volkmanns canals? which way do they run?
they run perpendicular (90 degrees) to haversian canals.
what are the layers called that surround the osteons? what is between these layers? these cells are embedded in what?
lamallae.
osteocytes.
lacunae (same as chondrocytes)
tiny lines radiating from ostecytes between layers of lamallae are? what do they carry?
canniculi (which also join to central canal).
O2, nutrients and waste NO blood.
what is the formation of spongy bone?
NO osteons, osteocytes are dispersed throughout the matrix.