What passes through the medullary canal?
However, the medullary cavity is the area inside any bone (long, flat, etc.) that holds the bone marrow. This area is involved in the formation of red blood cells and white blood cells, and the calcium supply for bird eggshells….
What are osteons composed of?
The osteon consists of a central canal called the 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.
What is inside the Haversian canal?
Each Haversian canal generally contains one or two capillaries and many nerve fibres. The Haversian canals surround blood vessels and nerve cells throughout bones and communicate with osteocytes (contained in spaces within the dense bone matrix called lacunae) through connections called canaliculi.
What is trabeculae made of?
A trabecula generally has a mechanical function, and is usually composed of dense collagenous tissue (such as the trabecula of the spleen). They can be composed of other materials such as muscle and bone. In the heart, muscles form trabeculae carneae and septomarginal trabecula.
What is a medullary canal?
Medical Definition of medullary canal : the marrow cavity of a bone.
Why is the medulla so important?
The medulla oblongata plays a critical role in transmitting signals between the spinal cord and the higher parts of the brain and in controlling autonomic activities, such as heartbeat and respiration.
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).
Why are osteons cylindrical?
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. Therefore, compact bone tissue is prominent in areas of bone at which stresses are applied in only a few directions.
What is Haversham Canal?
Haversian canals are a series of tubes around narrow channels formed by lamellae. The Haversian canals surround blood vessels and nerve fibers throughout the bone and communicate with osteocytes. The canals and the surrounding lamellae are called a Haversian system (or an osteon).
What is the interstitial lamellae?
the interstitial lamellae (K) fill the spaces between osteons. the circumferential lamellae (L) run around the circumference of the bone. The inner circumferential lamellae are located on the inner side of the compact bone tissue and the outer circumferential lamellae are located on the outside.
Is periosteum a bone?
The periosteum is a thin layer of connective tissue that covers the outer surface of a bone in all places except at joints (which are protected by articular cartilage). As opposed to bone itself, it has nociceptive nerve endings, making it very sensitive to manipulation.
Why do we use concrete lining in canals?
Therefore it is necessary to provide an impervious layer on the bed and side of the canal to minimize losses. The lining provided with concrete is called concrete lining, it is very useful because it allows a high reduction in seepage losses. It is strong, durable and used for any thickness for both small and large canals.
What are the different materials used in canal construction?
These can be constructed using different materials such as compacted earth, cement, concrete, plastics, boulders, bricks etc. The main advantage of canal lining is to protect the water from seepage loss.
What are the advantages of cement lined channels?
Cement Concrete Lining Cement Concrete linings are widely used, with benefits justifying their relatively high cost. They are tough, durable, relatively impermeable and hydraulically efficient. Concrete linings are suitable for both small and large channels and both high and low flow velocities. They fulfill every purpose of lining.
What are the different types of plastic membranes used for canal lining?
There are three types of plastic membranes which are used for canal lining, namely: Low density poly ethylene High molecular high density polythene Polyvinyl chloride