What are the two types of bone connective tissue are present in most bones?
Dense or cortical bone, solid. In long bones, compact bone forms the solid external walls of the bone
Cancellous or trabecular bone, porous, like a sponge, located internally within the epiphyses
Flat Bone of skull, the spongy bone is called
diploe (double) sandwiched between two layers of compact bone
Osteon (Haversian system)
The basic functional and structural unti of mature commpact bone, three dimensional structure
What is between adjacent lamellae, and what are they resting in?
OsteoCYTES resting in lacunae with canaliculi
How do nutrients reach the osteoCYTES
by diffusion through canaliculi that open onto the surfaces of the trabeculae
What are the components of an Osteon (Haversian system) ?
The central canal, concentric lamellae, osteocytes, canaliculi, perforating canals, circumferential lamellae, interstital lamellae
Small hair-like canals (on the end of bugs) extending from the central canal. Allow for diffusion of nutrients, waste products, hormones, etc. to lacunae.
(Volkmann Canals)structures through which blood vessels enter and exit the bone shaft (perpendicular) connect multiple central canals.
incomplete, no canal, leftover parts of osteons that have been partially resorbed
Where is the canaliculi located?
Permit intercellular contact and communication
Nutrients, minerals, gases and wastes travel through these passageways between the central canal and the osteocytes
Each lamella contains collagen fibers oriented in one direction. adjacent lamellae contain collgen fibers oriented in alternating directions