Clinical anatomy

Identify:

Macroscopic

• The orientation of the spinal cord, identifying the H-shaped grey matter, the white matter and the spinal ganglion.

• Locate the spinal ganglion next to the spinal cord. The pseudo-unipolar neurons are found in the spinal ganglion.

Microscopic

• Longitudinal grooves

• White matter

• Grey matter

• Central canal

• The multipolar neuron cell bodies found in the grey matter.

  1. Cell body.
  2. Nucleus
  3. Nissl-substance
  4. Axon hillock

• Nuclei of the neuroglia

• The pseudo-unipolar neuron cell bodies found in the spinal ganglion.

  1. Cell bodies
  2. Nuclei
  3. Nissl-substance

Draw and annotate:

A cross sectional line diagram of the spinal cord.

A detailed diagram of a number of neurons, showing myelinated axons, ependyma and neurophils.

A multipolar neuron cell body. Indicate the components of the neuron in detail.

A pseudo-unipolar neuron.

1. What is found in the longitudinal groove?
2. What does the white matter consist of?
3. What does the grey matter consist of?
4. What does the central canal carry?
5. What characteristic of the cell bodies is used in the identification of multipolar neurons?
6. What is characteristic of the nuclei of the neurons?
7. How does the Nissl-substance appear and what is it in reality?
8. What is characteristic of the axon hillock?
9. What is characteristic of the shape of a pseudo-unipolar neuron in comparison to that of multipolar neurons?
10. How do the granules of the Nissl-substance of pseudo-unipolar neurons differ from those of the multipolar neurons?

Microscope

Multipolar neuron

Pseudo-unipolar neuron

• Fig 026-001
• Fig 026-003
• Fig 026-004
• Fig 026-006
• Fig 026-007
• Fig 026-008
• Magnifier
• Spinal cord
• Spinal ganglion