olzforall.blogg.se

In total, around 100 billion neurons and 1,000 billion glial (support) cells make up the human brain. The brain is the most complex organ in the human body the cerebral cortex (the outermost part of the brain and the largest part by volume) contains an estimated 15–33 billion neurons, each of which is connected to thousands of other neurons. Now we will look at some of the parts of the CNS in more detail, starting with the brain. Click on it to interact and explore the model.

This is because they connect directly with brain tissue without intermediate nerve fibers.īelow is a 3D map of the CMS. The retina, optic nerve, olfactory nerves, and olfactory epithelium are sometimes considered to be part of the CNS alongside the brain and spinal cord. It also controls our breathing, heart rate, the release of some hormones, body temperature, and much more. The central nervous system has been thoroughly studied by anatomists and physiologists, but it still holds many secrets it controls our thoughts, movements, emotions, and desires. The brain and spinal cord are housed within a protective triple-layered membrane called the meninges. The brain is protected by the skull (the cranial cavity) and the spinal cord travels from the back of the brain, down the center of the spine, stopping in the lumbar region of the lower back. The CNS consists of the brain and spinal cord.

More detail and supporting information are in the main article. Here are some key points about the central nervous system. It looks at the types of cells involved, different regions within the brain, spinal circuitry, and how the CNS can be affected by disease and injury. It controls things like thought, movement, and emotion, as well as breathing, heart rate, hormones, and body temperature.ĬNS is referred to as “central” because it combines information from the entire body and coordinates activity across the whole organism. The central nervous system (CNS) consists of the brain and spinal cord.