6.3 Comparison of Compact & Spongy Bone

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What are the two types of bone connective tissue are present in most bones?

Compact bone
Spongy bone

Compact bone

Dense or cortical bone, solid. In long bones, compact bone forms the solid external walls of the bone

Spongy bone

Cancellous or trabecular bone, porous, like a sponge, located internally within the epiphyses

Trabecular bone

open lattice or narrow plates of bone, NO OSTEONS, but PARALLEL LAMELLAE

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

Trabeculae

a meshwork of crisscrossing bars and plates of bone pieces provides resistence

Spaces in Bone

central canal, canaliculi and lacunae

What are the components of an Osteon (Haversian system) ?

The central canal, concentric lamellae, osteocytes, canaliculi, perforating canals, circumferential lamellae, interstital lamellae

Central canal

channel in center of osteon containing blood vessels and nerves which supply bone

Concentric lamellae

rings of bone connective tissue surrounding the central canal

OsteoCYTES

Housed in lacunae and are found between adjacent concentric lamellae

Canaliculi

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.

Perforating canals

(Volkmann Canals)structures through which blood vessels enter and exit the bone shaft (perpendicular) connect multiple central canals.

What type of lamellae will you find beneath the periosteum?

circumferential lamellae

Interstital lamellae

incomplete, no canal, leftover parts of osteons that have been partially resorbed

What are some ORganic components of bone?

Cells, collagen fibers, and ground substance

What are some INorganic components of bone?

Calcium phosphate

Where is the central canal located?

Center of the osteon or (Haversian system)

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

Where is the lacunae located?

holes or pits in the osteon around the

Lamellae

Each lamella contains collagen fibers oriented in one direction. adjacent lamellae contain collgen fibers oriented in alternating directions

Lacuna

gap; missing part where chondrocytes reside

ChondroBLASTS

cells that produce the matrix of the cartilage and become encased in it then they become chrondroCYTES

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