DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Pyramidal neurons from the central nervous system growing on a fibroblast matrix, coloured scanning electron micrograph (SEM). Note the large dendrite (and axon) coming from opposite ends of the pyramidal cell bodies. Neurons are responsible for passing information around CNS and from the CNS to the rest of the body. Each nerve cell is composed of a cell body surrounded by numerous extensions (processes) called dendrites. In the case of a pyramidal nerve cell there is one major apical dendrite and few basal dendrites (not seen in this image). Dendrites collect information from other nerve cells or from sensory cells. Each neuron also has one process called an axon, which passes information to other nerve cells, or to effector cells such as muscle fibres. Neurons are cells of the nervous system that are specialized to carry messages through an electrochemical process. Magnification: x550 when shortest axis printed at 25 millimetres.
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