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level: Structure of Bone Tissue

Questions and Answers List

level questions: Structure of Bone Tissue

Question	Answer
Between the rings of matrix, the bone cells (osteocytes) are located in spaces called?	lacunae
Two types of bone tissue?	compact and spongy
3 types of cells that contribute to bone homeostasis	Osteoblasts, osteoclasts, osteocytes
Type of cell? (in bone homeostasis) bone-forming cell	Osteoblasts
Type of cell? (in bone homeostasis) resorb or break down bone	Osteoclasts
Type of cell? (in bone homeostasis) mature bone cells	Osteocytes
Identify what type of cell	Answer
Consists of closely packed osteons or haversian systems	compact bone
Osteon consists of a central canal called?	osteonic (haversian) canal - which is surrounded by concentric rings (lamellae) of matrix
Between the rings of matrix, the bone cells (osteocytes) are located in spaces called?	lacunae
Small channels (____) radiate from the lacunae to the osteonic (haversian) canal to provide passageways through the hard matrix.	canaliculi; haversian
True/False: In compact bone, the haversian systems are packed tightly together to form what appears to be a solid mass. The osteonic canals contain blood vessels that are parallel to the long axis of the bone. These blood vessels interconnect, by way of perforating canals, with vessels on the surface of the bone.	True
This is lighter and less dense than compact bone.	Spongy (Cancellous) Bone
Spongy bone consists of?	Plates (trabeculae), bars of bone adjacent to small, irregular cavities that contain red bone marrow
In spongy bone, the canaliculi connect to the adjacent cavities, instead of a central haversian canal, to receive their blood supply.	True
True/False: In Spongy bone, the trabeculae are arranged in a haphazard manner, but they are organized to provide maximum strength similar to braces that are used to support a building.	True
True/False: In spongy bone, the trabeculae follow the lines of stress and cannot realign if the direction of stress changes.	False. They can realign.
True/False: Compact bone tissue is composed of osteons and forms inner part of all bones. While Spongy bone is composed of trabeculae and forms the external layer of all bones.	False. Compact bones = external layer; Spongy bones = inner layer