![]() ![]() ![]() It’s important to note that “peripheral nerve” actually refers to the PNS. Nerves are made up of bundles of axons that work together to facilitate communication between the CNS and PNS. When the neurotransmitters bind to the dendrites of the next neuron, the chemical signal is again converted into an electrical signal and travels the length of the neuron. ![]() The neurotransmitters bridge the gap, called a synapse, between the axon and the dendrites of the next neuron.This leads to the release of molecules called neurotransmitters. At the end of the axon, the electrical signal is converted into a chemical signal.When neurons signal another neuron, an electrical impulse is sent down the length of the axon.So how exactly do neurons work? Let’s explore one type of neuron signaling below: Your brain alone contains approximately 100 billion neurons (though one researcher argues that figure is closer to 86 billion). Axons are often covered by a substance called myelin, which helps to protect and insulate the axon. It’s typically longer than the dendrites and carries signals away from the cell body where they can be received by other nerve cells. Axon: The axon also projects from the cell body.The number of dendrites on a neuron can vary. Dendrites: Dendrites are extensions from the cell body.Cell body: Similar to the other cells in your body, this area contains various cellular components like the nucleus.Your neurons work to conduct nerve impulses. So one spinal or cranial nerve may divide into anywhere from 2 to 30 peripheral nerves. The motor portions of the cranial nerves and spinal nerves divide into smaller nerves that divide into even smaller nerves. The many sensory nerves that bring sensation from the skin and internal organs merge together to form the sensory branches of the cranial and spinal nerves. There are several hundred peripheral nerves throughout your body. All but one of your spinal nerves transmits sensory information from this area back to the CNS. ![]() A dermatome is a specific area of skin that’s served by a single spinal nerve. Spinal nerves are also associated with dermatomes. That means that they can both send sensory information to the CNS as well as transmit commands from the CNS to your body’s periphery. Spinal nerves have both sensory and motor function. They’re grouped by the area of the spine that they’re associated with. It’s associated with many areas of the body including the throat, heart, and digestive tract. The exception to this is the vagus nerve, which is the longest cranial nerve. The cranial nerves originate in the brain and travel outward to your head, face, and neck. It transmits taste sensations from your tongue and also controls movement of some of the muscles in your face.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |