1. Compare and contrast the nerve fibers (neurons) exiting the spinal cord in th
ID: 3476413 • Letter: 1
Question
1. Compare and contrast the nerve fibers (neurons) exiting the spinal cord in the three primary divisions of the efferent peripheral nervous system (do NOT include the enteric nervous system). Include the presence/absence and location of ganglia relative to the spinal cord and effector organ, the level of the spinal cord from which they exit and the neurotransmitters released at each site You may answer in paragraph form, draw a picture, and/or use a table. (2 points) 2. Explain how the sensory nervous system differs from the efferent peripheral nervous system. Include a list of the various tracts (ascending, descending) and their function, the location of ganglia and a description of the different types of sensory receptors. (2 points)Explanation / Answer
1. AFFERENT, EFFERENT and AUTONOMIC NERVOUS SYSTEM
2 AFFERENT SYSTEM : brings information to the CNS via receptors. Enters DORSAL column of spinal cord , forms ganglia and ascends in the form of tracts towards brain via thalamus. Thus in spinal cord and thalamus ganglia are formed.
3. EFFERENT SYSTEM: begins from brain and follows the same path as that of afferent system. Enters into the VENTAL HORN OF SPINAL CORD forms ganglia with ALPHA MOTOR NEURONS. These neurons innervste muscles and cause their contraction.
4. AUTONOMIC NERVOUS SYSTEM consists of SYMPATHETIC and PARASYMPATHETIC divisions.
It has preganglionic and POSTGANGLIONIC fibres.
In PARASYMPATHETIC SYSTEM preganglionic are long and form ganglia with postganglionic which are short. Releases acetylcholine
In SYMPATHETIC preganglionic are short and POSTGANGLIONIC are long and terminates on end organ. Releases acetylcholine and noradrenaline.
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