The spinal cord lies in the spinal canal. It is a cylindrical cord with a diameter of about 1 cm. At the top, the spinal cord passes into the brain, at the bottom ends at the level of the second lumbar vertebra with a bundle of nerves extending from it, resembling a horse’s tail.
On the front and back surfaces of the spinal cord, deep grooves pass, dividing it into two halves, connected in depth by a central bridge. At the very center of the spinal cord, a central canal passes, also filled with cerebrospinal fluid.
Around the central channel is gray matter, consisting of the bodies of neurons and their dendrites. It occupies the entire central part of the spinal cord and stretches from top to bottom in the form of gray pillars. On a cross section, the gray matter looks like a butterfly.
White matter is located in the outer part of the spinal cord. It contains a mass of nerve fibers that connect the neurons of the spinal cord to each other, as well as to the neurons of the brain.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.