Are you curious to know which tissues and organs lack blood vessels? Many parts of the body, from bones to ocular lenses, are considered to be avascular, or not having blood vessels. This article will explain what avascularity is, the different organs and tissues that lack blood vessels, and the functions of avascular tissues.
What is Avascularity?
Avascularity is the absence of blood vessels in a tissue or organ. It is the complete absence of blood vessels, capillaries, and even lymphatic vessels. Although there are some exceptions, the majority of avascular organs and tissues require oxygen, nutrients, and waste removal via diffusion from outside sources.
Which Organs and Tissues are Avascular?
The most well-known avascular organs are the liver, the pancreas, and the spleen. Other organs, such as the lungs, kidneys, and gallbladder, also lack blood vessels. Additionally, several tissues such as the vitreous humour of the eye, the intervertebral discs of the spine, and the articular cartilage of joints are avascular.
What are the Functions of Avascular Tissues?
Avascular tissues and organs are able to perform many of the same functions as those with blood vessels, although they do so in a slightly different manner. The vitreous humour of the eye, for example, helps to maintain and protect the structure of the eye by providing cushioning and lubrication. Similarly, the intervertebral discs of the spine help to provide cushioning and protection for the spine, as well as supporting muscular movements. Finally, the articular cartilage found in joints helps to reduce friction between the two bones and allow for smooth and flexible movement.
In conclusion, some organs and tissues of the body are considered to be avascular, meaning they lack blood vessels. These organs and tissues include the liver, pancreas, spleen, lungs, kidneys, gallbladder, vitreous humour of the eye, intervertebral discs of the spine, and the articular cartilage of joints. Avascular tissues have several important functions, such as providing cushioning, protection, and lubrication, as well as reducing friction between two bones.