- Review the following terms: lamellae, lacunae, canaliculi, Haversian system, compact bone, cancellous bone, trabeculae
- Identify that the osteon is the functional unit of bone
- Describe how the cells of compact bone arrange themselves
- Describe what a Haversian canal is and what is within it
- Identify the lamellae and canaliculi within compact bone
- Identify what the composition of the lamalle is
- Describe what creates the canaliculi and why these are important
- Identify that compact bone is strong yet flexible and how the design of compact bone creates these properties
This packet breaks down the composition and organization of compact bone with more depth than in the histology collection. The information you will learn in this packet will be important for understanding the remodelling process.
Before you go through this packet make sure you have at least gone through Bone Features first: http://www.sophia.org/packets/general-features-of-bone
Compact bone is a highly organized tissue found within our bones. The three dimensional functional units within compact bone are called osteons. The cells within the bony matrix of the osteons are called osteocytes. As you look at images of the osteons notice how the osteocytes organize themselves around the hollow central canal called a Haversian canal. The Haversian canal is the life source of the osteocytes as it contains blood vessels, nerves and lymphatics. The osteocytes have cellular extensions that toward each other and the Haversian canals within small canals called canaliculi. This feature is especially important for the cells that are farther away from the Haversian canal because this gets them closer to the vessels within the canal. Notice all of the dark heavy looking material in between the osteocytes, that is the lamallae or compact bony matrix.
Source: The mind of Aaron
This video will break down the osteon and how Haversian canals are organized within compact bone.
Source: Self made with images from Marieb and http://www.udel.edu/biology/Wags/histopage/colorpage/colorpage.htm
Here are some images for you to study after watching the above video. Try identify all of the structures that are in the first slide (list of terms)
Source: Self made with images from http://www.udel.edu/biology/Wags/histopage/colorpage/colorpage.htm