In the Peripheral Nervous Systems of Higher Vertebrates, Regenerating Axons

question 154

Multiple Choice

In the peripheral nervous systems of higher vertebrates, regenerating axons are guided to their correct targets by

• A) growth cones.
• B) blueprints.
• C) differential adhesiveness.
• D) oligodendroglia.
• E) Schwann-cell sheaths.

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Definitions:

Mesoderm

The middle layer of an embryo in early development, which gives rise to muscles, bones, and other connective tissues.

Ectoderm

The outermost layer of cells or tissue of an embryo in early development, giving rise to the outer layer of skin and nervous system.

Endoderm

The innermost layer of cells or tissue of an embryo in early development, which gives rise to the linings of the digestive and respiratory systems.

Trichomoniasis

A sexually transmitted infection caused by the parasite Trichomonas vaginalis, resulting in itching, burning, and often a greenish discharge.