Specialized Connective Tissue

Weight Bearing

Avascular-slow healing

Long Mitosis process

Chondrocitee cells located in LACUNAE

Hyaline

Elastic

Fibrocartilage

Most common

glassy look

found at ends of bones for cushioning

reducesn friction

i.e. Nose, trachea, bronchi (lungs)

Numerous elastic fibers

i.e. earlobes, epiglottis (larynx)

does not calcify (become hard)

Many collagenous fibers, few cells

Shock absorber

found in places of great pressure

i.e. spine, kness, padding in pubic bone

a very tough tissue

strongest of cartilage types

Supports weight

dynamic-changes over time

highly vascularized

major mineral storage (calcium)

Support and Protection

Shape

weight support

protects: skull=brain, pelvis=reproductive

movement

hematopoiesis=blood cell formation

storage=calcium phosphate

Osteoblasts

osteocytes

osteoclasts

builds bone

immature cell type

replicate easier than osteocyte

lines the surface of growing bone

makes osteoid

functions to produce organic matrix of bone

Numerous interconnecting cytoplasmic processes occupying canaliculi (small channels through blood)

Most mature cell type

Each osteocyten has its own lacunae

breaks down bone

breaks down bone to release CALCIUM

Arise from blood and bone marrown (wbc's)

Has Howships Lucunae-ruffled border

Ruffled Border of branching finger like processes poking into surface of bone

increase surface area

secretes acid that dissolves inorganic component of calcified matrix

enzymes exocytosis digest organic component

Located around bone

highly vascularized

i.e. femur

Has 2 layers

1.) Outer layer

2.) Inner layer

Numerous spaces (holes)

Lightens weight of bone

Has Trabeculae-bony plates with irregular arrangements

found on ends of bones-epiphysis

No marrow spaces

tightly packed

has osteons (Haversian system)

On outer surface of every bone in body

found on walls of long bones-DIAPHYSIS

Also called Osteon-basic unit of compact bone

Houses blood vessels and nerve fibers

Nourish the osteocytes of osteon via diffusion of nutrients and oxygen through the bone fluid that fills each canaliculi

Adjacent to Haversian canals

Continuous with the periosteum and transmit blood vessels and nerves from this layer into the compact bone

Bones originate within sheetlike layers of connective tissue

broad, flat bones

skull bones (not mandible bone)

Bones begin as hyaline cartilage

most bones of skeleton