Nerve: Answers

#85 Spinal Cord, Human, Cat Cross section (Nissl stain)

• Is there Nissl substance in the dendrites?
  Yes.
• In the axons?
  No.
• To what structures at the electron microscopic level do the Nissl bodies correspond?
  RER, free ribosomes.

#83 Thoracic Sympathetic ganglion, Human

What is the functional consequence of the location of these neurons (that is, the parasympathetic ganglion) near the target organ?
Nerve impulses reach the target organ more quickly via the parasympathetics because the postganglionic fiber (which is nonmyelinated) is much shorter in the parasympathetic system.

#39 Colon, Monkey (H&E, thin plastic section)

Locate neuronal cell bodies within the ganglia. What other types of cell would you expect to find in these ganglia?
Glia.

#80 Sciatic Nerve of Monkey, 2 sections (Cajal)

Find some nodes of Ranvier. What is their role?
Site where depolarization occurs in myelinated nerves.

Peripheral Nerves

#113 Artery, vein and nerve, primate (H&E)

What are the cells within the nerve whose nuclei are stained?
Schwann cells, fibroblasts.

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