07 Quiz Info - Physiology 202 CCO,Summer,2011 Lesson 7 Quiz...

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Physiology 202 CCO,Summer,2011 Lesson 7 Quiz FANTASTIC!! The mean (average) on this quiz was 90.77% and 7 students scored 90% or above. The distribution of scores is shown in the graph to the right. Explanations for Selected Questions Given the excellent performance on this quiz, there are not very many questions that need much attention ! But, I’ll provide explanations for the more difficult questions. No part of Question 1 was particularily challenging. Most could be answered using the figure to the right or Fig. 6.46 of the textbook . 1
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Question 2 provided you with the following choices. a.  sympathetic  division  only b.  parasympathetic  division  only c.   somatic  division  only d.  a and  b e.   a and  c f.   b and  c g.   a,  b, and  c h.  None One question that many of you missed was the following: Cell  bodies  of some  neurons  in the  _______  are  located  in brainstem.   The correct answer was the parasympathetic division and the somatic division. Most of you who missed this question picked parasympathetic only. However, please re-read the following from the Lesson 7 Outline with a focus on the underlined text. Part 2: Review of the Somatic Efferent Division I. Somatic motorneurons, also known as “lower motorneurons,” are the neurons that form synapses on skeletal muscle fibers. II. The cell bodies and dendrites of somatic motorneurons are located in the central nervous system—either in the brainstem or in the spinal cord (all segments). A. Somatic motorneurons with cell bodies in the brainstem innervate skeletal muscles of the head and neck. See Table 6-8. 1. Their cell bodies are located in “cranial nerve nuclei” in the brainstem. 2. Their axons exit the brainstem and form parts of cranial nerves. B. Somatic motorneurons with cell bodies in the spinal cord innervate skeletal muscles from about the neck down. 1. Muscles of the upper limbs are innervated by motorneurons with cell bodies in the cervical enlargement. 2. Muscles of the lower limb are innervated by motorneurons with cell bodies in the lumbar enlargement. Another challenging question was: Cell  bodies  of neurons  in the  _______  are  located  in the  ventral horn  of the  spinal  cord. The following was introduced in Lesson 5 Outline. See the underlined text. 2
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Part 8: The Skeletal Neuromuscular Junction I. At skeletal neuromuscular junctions, the presynaptic neurons are somatic motorneurons and the postsynaptic cells are skeletal muscle fibers (muscle cells, myofibers). See the figures below.
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