Question

What is a nerve? Neuron? Where are the epineurium, perineurium, and endoneurium located?

a) A nerve is a bundle of neurons; a neuron is a supportive cell
b) A nerve is a supportive cell; a neuron is a conducting cell
c) Epineurium surrounds a single nerve fiber; perineurium surrounds a bundle of nerve fibers; endoneurium surrounds individual nerve fibers
d) Epineurium surrounds a bundle of nerve fibers; perineurium surrounds individual nerve fibers; endoneurium surrounds a single nerve fiber

Answer 1

Nerves are bundles of axons in the PNS, composed of nervous tissue, connective tissue layers, and blood vessels. They are surrounded by the epineurium, perineurium, and endoneurium. Neurons are the conducting cells of the nervous system, consisting of a cell body, dendrites, and an axon.

Step-by-step explanation:

Nerves are bundles of axons in the peripheral nervous system (PNS), composed of nervous tissue, connective tissues, and blood vessels. They have three layers of connective tissue: the epineurium (outer layer), the perineurium (surrounding fascicles), and the endoneurium (surrounding individual nerve fibers). Neurons, on the other hand, are conducting cells that transmit impulses. They consist of a cell body, dendrites (thin extensions), and an axon (long tail). Neurons can be categorized as multipolar, bipolar, or unipolar depending on the number of dendrites and axons.