Lab IX: Nervous System Histology and Spinal Cord
Part II: Neurons and nerve struture
1.) There are three types of neurons. The first is the multipolar, which is the most common, and they are found as motor neurons and interneurons throughout the central nervous system. The second type of neuron is the unipolar neuron, which are also called psuedounipolar neurons. They are found as spinal and cranial sensory neurons. The last neuron is the bipolar neuron. They are only found in olfactory, visual and auditory pathways of the special senses.
2.) On a neuron, the dendtrites receive impulses from other neurons. This information is then passed down to the cell body and on to the axon. Once the information has arrived at the axon, it travels down the length of the axon in the form of an electrical signal known as an action potential. Neurotransmitters are needed to send the information from one neuron to the next. Neurotransmitters are chemical messengers that are released from the axon terminals to cross the synaptic gap and reach the receptor sites of other neurons.
3.) Telondendria are the terminals or branches of an axon that terminates or where the axons split off and releases neurotransmitters
4.) The nissl body is a large granule body found in neurons. They are so highly concentrated they can be seen with a light microscope when properly stained. They are made of rough endoplasmic reticulum and are the site of protein synthesis. They manufacture the neurotransmitters which the neuron must secrete.
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