Biology · Ch 10 — Animal Tissue
Types of Neurons Based on Number of Processes
Types of Neurons Based on Number of Processes
Based on the number of cytoplasmic processes given off from the cyton, neurons are classified into three structural types:
Unipolar (Monopolar) neuron: has only a single process arising from the cyton; both the axon and the dendron actually originate from the cyton at the very same point before separating. These neurons conduct impulses toward the central nervous system. Example: the neurons of the dorsal root ganglion of a spinal nerve.
Bipolar neuron: has two processes — a single dendron and a single axon — given off from opposite poles of the cyton. Bipolar neurons are involved in transmitting the special senses, such as sight, smell, taste and hearing. Example: the neurons of the retina of the eye, and of the olfactory epithelium. …
What this figure shows. A cross-section through a whole spinal nerve, shown at two magnifications: the outer epineurium sheath wrapping the whole nerve, subdividing it into bundles (fascicles) each wrapped in its own perineurium; within a fascicle, a close-up view shows individual nerve fibres, each an axon surrounded by its myelin sheath and a thin endoneurium covering, with a blood vessel running alongside the fascicle. Note: the source textbook prints this figure with the same number (10.19) as the multipolar-neuron diagram earlier in this chapter — an apparent duplicate figure-numbering in the original book, prese …