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Lab 6 - axons(unlabeled which look like darker lines...

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Lab 6 The myelencephalon consists of the medulla oblongata . Posteriorly the medulla oblongata merges with the spinal cord. The medulla oblongata regulates many visceral activities; these include: breathing movements, rate of heartbeat, blood pressure, swallowing, and salivation.
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You should be able to find the neural spine , the transverse process , the vertebral canal and the body of the vertebra .
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The two smaller oval structures in the canal are sections through the dorsal root ganglia . The dorsal and ventral roots are visible You should be able to find some motor cell bodies (unlabeled, but stained red) which have a number of spider-like projections from the central cell body; you will examine these in more detail in the histology lab. You may see some
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Unformatted text preview: axons (unlabeled), which look like darker lines, leading from the gray matter into the white matter. When a physician strikes your patellar tendon, the tendon fibers are stretched and activate the golgi tendon organ ( receptor ). (This mimics what would happen to the tendon if one were to fall over backwards.) An action potential results, and is carried toward the spinal cord. Within the gray matter the sensory neuron synapses with an interneuron . The interneuron in turn synapses with one or more motor neurons , and an action potential is in turn initiated in the motor neuron(s). The motor neurons carry an action potential to various leg muscles , which contract and cause your leg to extend (to prevent falling!)....
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