Structure of Compact and Spongy Bone
What is Canaliculi?
Canalculi are the spaces that connect lacunae with one another and, eventually, with the central canal
Structure of Compact Bone
Haversian system:(1. Lamellae 2. Lacunae 3. Canalculi) 4. Central (Haversian) Canals 5. Perforating (Volkmann's Canals
Differences of Spongy Bone to Compact Bone
In contrast to compact bone, spongy bone does not contain osteon.
What is lacunae?
Lacunae are small spaces between the lamellae, which contain osteocytes
Parts of the Haversian System
Lamellae Lacunae Canaliculi
Structure of Spongy Bone
Spongy bone consists of irregular, thin plates of bone, called trabeculae. The spaces between the trabeculae are filled with red marrow, which produce blood (all blood cells are produced in bone marrow)
What is the function of central (haversian) canals?
The central canals run longitudinally through the bone, that contains one or more blood vessels that supply the osteon
What does the Haversian system/ osteon do?
The haversian system/osteon is a structural unit in which many units are cemented together in order to form the substance of compact bone
What is lamellae?
The lamellae of each osteon are cylindrical and are aligned parallel to the long axis of the central canal (a ring of hard, calcified matrix)
What is the function of the perforating (volksmann's) canals?
The perforating canals run at right angles to the long axis of the bone. Blood vessels in these canals deliver blood to the osteon deeper in the bone and supply the interior marrow cavity
What is the structural unit of compact bone called?
The structural unit of compact bone is called the osteon or that Haversian system