What is the definition osteon?
osteon, the chief structural unit of compact (cortical) bone, consisting of concentric bone layers called lamellae, which surround a long hollow passageway, the Haversian canal (named for Clopton Havers, a 17th-century English physician).
What is osteon quizlet?
Osteon. The basic unit of structure in adult compact bone, consisting of a central (haversian) canal with it’s concertrically arranged lamellae, lacunae, osteocytes, and canaliculi. Also called haversian system.
What is another word for osteon?
haversian system
A structural unit of bone consisting of a haversian canal and corresponding lamellae of compact bone. Also called haversian system.
What are the 5 parts of an osteon?
Terms in this set (6)
- Haversian Canal. Central canal of the individual osteon.
- Volksmann’s Canal. Canals that come off the Haversian canal and run horizontal.
- Lacunae. Contains the osteocyte.
- Osteocyte. Within the lacunae.
- Lamella. Space between rows of lacunae.
- Canaliculi. Spider legs that connect lacunae to one another.
What do osteons look like?
Each osteon looks like a ring with a light spot in the center. The light spot is a canal that carries a blood vessel and a nerve fiber. The darker ring consists of layers of bone matrix made by cells called osteoblasts (check your textbook for an explanation of the difference between osteoblasts and osteocytes).
What is an osteon or a haversian system?
The osteon or haversian system /həˈvɜːr. ʒən/ (named for Clopton Havers) is the fundamental functional unit of much compact bone. Osteons are roughly cylindrical structures that are typically between 0.25 mm and 0.35 mm in diameter.
What osteoclast means?
An osteoclast is a specialized cell that absorbs and removes bone, allowing for the development of new bone and maintenance of bone strength.
What is the function of the osteon system?
It provides protection and strength to bones. Compact bone tissue consists of units called osteons or Haversian systems. Osteons are cylindrical structures that contain a mineral matrix and living osteocytes connected by canaliculi, which transport blood. They are aligned parallel to the long axis of the bone.
What do osteocytes do?
They regulate passage of calcium into and out of the bone, and they respond to hormones by making special proteins that activate the osteoclasts. OSTEOCYTES are cells inside the bone.
Are osteons avascular?
In contrast to pigeon humeri where laminar bone is present, the primary tissue of these bat bones is largely avascular, but secondary osteons are present and are usually in the deeper cortex.
Is osteon compact bone?
Compact bone consists of closely packed osteons or haversian systems. The osteon consists of a central canal called the osteonic (haversian) canal, which is surrounded by concentric rings (lamellae) of matrix.
What are the black spots on the osteon?
Each bone in your body is made up of three main types of bone material: compact bone, spongy bone, and bone marrow. Cross section showing osteons. The large dark spots are passages for blood vessels and nerves. The little black spots are osteocytes.