![]() ![]() The brain eventually finds out what is going on, but our body has done the smart thing and moved first. Our hand actually moves before the brain tells it to. This happens when we touch something hot. Sometimes we need to move so fast that our brains don't have time to think. Axons connect to the muscles and tell them what to do. They talk to dendrites from the cell next to them over something called a synapse. Dendrites are branches off the main cell body. Each motor neuron has three important parts: the cell body, dendrites, and the axon. To learn more about neurons, let's take the motor neuron for example. Somatic nervous system - These are the nerves that we actively control, like jumping with our legs or moving our arms.Įach nerve is made up of many cells called neurons.I'm sure I'd forget and would be dead in no time! Fortunately, the autonomic nervous system takes care of this for us. It would take a lot of concentration if we had to constantly tell our heart to beat or our digestive system to release certain enzymes. We don't have to think about them, the brain does it all for us. Autonomic nervous system - This set of nerves works automatically.Within the peripheral nervous system there are also two main sets of nerves: the autonomic nervous system and the somatic nervous system. In each case, the signals only go in one direction: The motor nerve signals travel from the brain to the muscle and the sensory nerve signals travel from the senses to the brain. They come from our skin (touch), eyes (sight), tongue (taste), nose (smell), and ears (hear). These nerves carry signals to the brain to tell it about what is going on in the outside world. Sensory nerves - The second type of nerves are called sensory nerves.The brain sends signals over the motor nerves to tell our muscles to expand or contract so we can move. Motor nerves - Motor nerves allow the brain to control our muscles.There are two main types of nerves: motor nerves and sensory nerves. Some nerves are really long, like the ones that go all the way from your feet to your spinal cord. Inside each nerve is a bundle of nerve fibers. Nerves are sort of like wires that carry communication signals or impulses around the body. The rest of the nerves together are called the peripheral nervous system. The brain and the spinal cord make up what is called the central nervous system. It wouldn't know anything that was going on in the outside world and wouldn't be able to control our body. Without the nervous system our brain would be mush. Together the nervous system helps different parts of our body communicate and allows our brain to control what is going on. O h O nce O ne T akes T he A natomy F inal V ery G ood V acations A re H eavenly.The nervous system is made up of the brain, the spinal cord, and a large network of nerves that covers all parts of the body.Hypoglossal nerve - motor fibers for tongue movements sensory impulses from tongue. ![]() Accessory nerve - motor fibers to sternocleidomastoid & trapezius.Vagus nerves - sensory and motor fibers for pharynx, larynx, and thoracic & abdominal viscera (mostly parasympathetic = promote digestion & regulate heart activity).Glossopharyngeal nerve - sensory for posterior taste buds motor fibers to the pharynx (swallowing & saliva production) carotid artery pressure sensors.Vestibulocochlear nerve - sensory for balance and hearing.Facial nerve - sensory for anterior taste buds motor fibers for facial expression and lacrimal & salivary glands.Abducens nerve - motor fibers to eye muscles (lateral movement).Trigeminal nerve - sensory for the face, nose, & mouth motor fibers to chewing muscles.Trochlear nerve - motor fiber to eye muscle (superior oblique).Oculomotor nerve - motor fibers to eye muscles (most movements, lens shape, & pupil size). ![]()
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