. Biology and man. Biology; Human beings. r*r End plate of nerve in muscle fiber Nerve endings in gland. Motor Sensory NERVE CONNECTIONS Associative Nerve cells are connected with sensory receptive organs (such as eyes or ears), with muscles or glands, and with other nerve cells. The end branchings of a nerve cell form intimate connections with the branchings of another nerve cell or with other tissue cells. Nerve impulses pass through a nerve cell in one direction only, although on electric current can be made to pass through a nerve cell in either direction main nerve runs the length of the
. Biology and man. Biology; Human beings. r*r End plate of nerve in muscle fiber Nerve endings in gland. Motor Sensory NERVE CONNECTIONS Associative Nerve cells are connected with sensory receptive organs (such as eyes or ears), with muscles or glands, and with other nerve cells. The end branchings of a nerve cell form intimate connections with the branchings of another nerve cell or with other tissue cells. Nerve impulses pass through a nerve cell in one direction only, although on electric current can be made to pass through a nerve cell in either direction main nerve runs the length of the body. This has side branches which con- nect with the skin and special sense organs and also with muscles (see illus- tration above). These connections have been definitely traced in many kinds of animals, including man. Moreover, experiments show clearly that the parts of the structure behave in complete agreement with the idea of a "reflex" (see page 262). There is a definite nerve connection between the point of stimulation and the acting muscle. This path consists of at least two parts: (1) an afferent or incoming neuron, the sensory portion; and (2) an efferent or outgoing neuron, die motor portion. Most reflexes involve one or more intermediary associative neurons. The entire path makes up the reflex arc (see illustration, p. 282). In all animals with a central nervous system the axis contains fibers that run, so to say, forward and backward, connecting ganglia in the various segments. Through these nerve connections stimuli acting upon receptors in one part of the body can produce effects in other segments, both in front of and behind the stimulated region. 277. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965; Bingham, N. Eldred (Nelson El
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