Bones Flashcards
Osteon
The structural unit of compact bone, can also be referred to as the Haversian system.
Consists of an elongated, cylindrical structure consisting of a number of concentric rings of lamellae surrounding a central canal.
Circumferential Lamellae
Rings of calcified extracellular bone matrix that line the inner and outer surfaces of compact bone.
Interstitial Lamellae
Areas of incomplete lamellae present in the areas between osteons.
This lamellae is formed from old fragments of osteons that have been partly destroyed during bone resorption or growth.
Lamellae
concentric rings of calcified extracellular matrix.
Lacunae
tiny cavities located between the lamellae that contain the spider-like osteocytes.
Canaliculi
Hair-like canals filled with extracellular fluid, radiate from the lacunae.
Their purpose is to connect lacunae to each other, providing many routes for nutrients to reach the osteocytes and to remove their waste.
Central canals
canals channels that run through the core of each osteon and facilitate the passage of neurovascular structures, such as small blood vessels and nerve fibers.
These can also be known as Haversian canals
Perforating canals
also known as Volkmann’s canals, are transverse channels that lie at 90 degrees to the central canals and long axis of the bone.
These channels serve to connect the blood and nerve supply of the periosteum with the neurovascular supply of the central canals and medullary cavity.