What is the brain?
In the article we will tell you about what the brain of humans and animals is, what functions it performs in the body, as well as what types it has (head, spinal, bone).
What is the brain - the definition
The brain is the central part of any nervous system - both people and animals, which is usually located in the anterior or head part of the body and is a compact cluster of nerve cells, as well as their processes. The brain can also be surrounded by connective tissue. And in vertebrates (which include humans), the brain is divided into the head, which is located in the cavity of the skull, and the spinal cord, which is located in the spinal canal. By the way, the brain must be distinguished from the brain. What are brains? It is primarily a tissue that fills the skull of humans and animals, as well as (in a colloquial sense) the mind and mental abilities.
What is the brain
The brain is part of the central nervous system (CNS) in the vast majority of chordates, in fact, it is the head end of the nervous system. In vertebrate animals, the brain is located inside the skull.In anatomy, it is most often denoted by the word "encephalon", which is a Latinized form of the Greek word. The brain consists of a huge number of neurons that are interconnected by nerve synaptic connections. Neurons interacting with each other through these connections form rather complex electrical impulses that control the activity of the rest of the organism.
What is bone marrow?
Bone marrow is the most important organ of the hematopoietic system of the mammalian body, since it carries out hematopoiesis, or, in simple terms, hematopoiesis - the process of formation of new blood cells instead of dying off and already dead. Also, the bone marrow is one of the most important organs of immunopoesis, that is, the formation of the immune system. Together with the peripheral lymphoid organs, the bone marrow protects the body against harmful viruses and bacteria and, in fact, is analogous to a factory bag, an immune organ found in birds. Also, the bone marrow is the only tissue of the body of an adult mammal, which normally contains a large number of immature cells or, as they are also called, stem cells, which in their structure are close to embryonic ones.Other immature cells, such as skin cells, already have a greater degree of maturity and differentiation than bone marrow cells, and also have a given specialization.
What is the spinal cord
The spinal cord (from the Latin Medulla spinalis) is the organ of the CNS of the vertebrates, which is located in the spinal canal. It is believed that the border between the brain and the spinal cord is the crosshair of pyramidal fibers, although it must be said that this border is very conditional. The spinal cord has an internal cavity, which is called the central canal (lat. Canalis centralis). It should also be noted that it is protected by membranes: dura mater and soft arachnoid. The space between the membranes and the vertebral canal is filled with cerebrospinal fluid, and the cavity between the outer membrane and the bones of the vertebrae (the so-called epidural space) is filled with a venous network and fat. The spinal cord receives signals from the brain and transmits them to the nerve cells of the corresponding organs.