Olfactory cells in the mucous membranes lining each nostril react to chemicals we breathe in and send messages along specific nerves to the brain — which, according to experts, can distinguish between more than 10,000 different smells. It is instrumental in the sense of smell. Motor nerves send signals from the brain back into the muscles, causing them to contract either voluntarily or reflexively. The spinal nerves are divided into four main categories of spinal nerves based on the location from which they branch . The human body contains some 100 billion neurons, which form a part of the nervous tissue (the brain, the spinal cord and the nerves). These allow us to control the many muscles in our bodies. There are 3 main parts of the brain include the cerebrum, cerebellum, and brain stem.The Cerebrum can also be divided into 4 lobes: frontal lobes, parietal lobes, temporal lobes, and occipital lobes.The brain stem consists of three major parts: Midbrain, Pons, and Medulla oblongata. Analyze a complex situation? Many nerve tracts, which transmit information to and from the cerebral cortex to the rest of the body, pass through the brainstem. Probably billions. A deep part of the brain, located in the brainstem, the pons contains many of the control areas for eye and face movements. Microanatomy. Medulla. The nerve signals in these reflexes come from stretch receptors located in the joints, ligaments, tendons, and even the muscles themselves. 8 cervical (C1-C8) nerves emerge from the cervical spine (neck) The human brain is primarily composed of neurons, glial cells, neural stem cells, and blood vessels. The motor roots carry impulses from the brain and spinal cord to the muscles of the body. There are basically two major types of nerves: sensory and motor. The motor regions of the brain and spinal cord control most of the nerve impulses that stimulate muscles in this region. Cranial nerves are the nerves that emerge directly from the brain (including the brainstem), of which there are conventionally considered twelve pairs.Cranial nerves relay information between the brain and parts of the body, primarily to and from regions of the head and neck, including the special senses of vision, taste, smell, and hearing.. Sensory nerves send information such as touch, temperature, and pain to the brain and spinal cord. Although their shape can vary, all of the neurons have a similar structure: a cell body with extensions (dendrites and an axon), which provide for the reception and transmission of nerve messages. These nerves pass from the brain through openings in the skull called foramina, to supply various parts of the head and … We still haven't scratched the surface of how many neurons you've got. The lowest part of the brainstem, the medulla is the most vital part of the entire brain and contains important control centers for the heart and lungs. The olfactory nerve is the shortest of the 12 cranial nerves and only one of two cranial nerves (the other being the optic nerve) that do not join with the brainstem. (The picture of the brain above is 12kb [9,399 bytes], or 75,192 individual bits of information.) However, many reflex pathways are also active in the legs and foot. The University of Tennessee points out that the elephant's brain is about three times as big as that of a human and contains about three times as many nerves. The brain is a 3-pound organ that contains more than 100 billion neurons and many specialized areas. Spinal cord. Nerves arising directly from the brain are called cranial nerves, while those arising from the spinal cord are called peripheral nerves. https://www.healthline.com/health/how-many-nerves-are-in-the-human-body The olfactory nerve, or cranial nerve I, is the first of the 12 cranial nerves. How many bits does it take to shape a whole thought? All nerves ultimately connect to the brain. 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