How many laminae are present in the grey matter of?
This article will focus on the organisation and function of the spinal cord grey matter. Spinal cord grey matter can be functionally classified in three different ways: 1) into four main columns; 2) into six different nuclei; or 3) into ten Rexed laminae.
What is white and grey matter in the spinal cord?
The central nervous system, which consists of the brain and spinal cord, contains two types of tissue. … Gray matter contains neural cells, dendrites, and axon terminals, while white matter consists of axons and myelin, and plays a key role in nerve cells’ ability to connect to one another.
What is the difference between GREY and white matter?
What is the difference between grey and white matter in the brain? … The grey matter contains the cell bodies, dendrites and the axon terminals, where all synapses are. The white matter is made up of axons, which connect different parts of grey matter to each other.
What is lamina in biology?
Lamina is a general anatomical term meaning “plate” or “layer”. It is used in both gross anatomy and microscopic anatomy to describe structures. … The vertebral laminae: plates of bone that form the posterior walls of each vertebra, enclosing the spinal cord. The laminae of the thalamus: the layers of thalamus tissue.
What reduces grey matter?
A new study suggests that playing action video games can be detrimental to the brain, reducing the amount of gray matter in the hippocampus. Specialists should exert caution in advising video gameplay to improve cognition, the study authors urge.
What happens if you have too much grey matter?
The outside of the spinal cord is composed of large white matter tracts. Transecting or compressing these tracts can lead to paralysis because information from the brain’s motor cortex (grey matter) can no longer reach the spinal cord and muscles.
What are the 3 functions of spinal cord?
The main functions of the spinal cord are: To conduct reflexes below the neck. To conduct messages from the skin and muscles to the brain. To conduct commands from the brain to muscles of the trunk and limbs.
What are the 2 functions of the spinal cord?
The spinal cord functions primarily in the transmission of nerve signals from the motor cortex to the body, and from the afferent fibers of the sensory neurons to the sensory cortex. It is also a center for coordinating many reflexes and contains reflex arcs that can independently control reflexes.