Questions: Which of the following keep(s) nerve fibers insulated from one another? Multiple Choice Epineurium Perineurium Fascicles Endoneurium Blood vessels

The answer is the fourth one: Endoneurium.

Explanation for each option:

1. Epineurium: This is the outermost layer of connective tissue that surrounds the entire nerve. It provides protection and support but does not specifically insulate individual nerve fibers from one another.

2. Perineurium: This is a layer of connective tissue that surrounds a bundle of nerve fibers, known as a fascicle. It provides a barrier to protect the nerve fibers within the fascicle but does not insulate individual nerve fibers.

3. Fascicles: These are bundles of nerve fibers. While they are surrounded by the perineurium, they themselves do not provide insulation to individual nerve fibers.

4. Endoneurium: This is the correct answer. It is a delicate layer of connective tissue that surrounds each individual nerve fiber within a fascicle, providing insulation and protection.

5. Blood vessels: These supply nutrients and oxygen to the nerve but do not provide insulation to nerve fibers.

6. Prey: This option is unrelated to the context of nerve fiber insulation.

In summary, the endoneurium is responsible for insulating individual nerve fibers from one another.