CONNECTIVE TISSUE SHEATHS OF THE NERVE TRUNK: a. endoneurium b . perineurium C exoneurium d ectoneurium e epineurium

The correct answer is e. epineurium.<br /><br />The epineurium is the outermost layer of connective tissue that surrounds the entire nerve trunk. It provides structural support and protection to the nerve fibers within.<br /><br />The other options are incorrect:<br /><br />a. Endoneurium: This is the innermost layer of connective tissue that surrounds individual nerve fibers within a nerve.<br /><br />b. Perineurium: This is a layer of connective tissue that surrounds a bundle of nerve fibers, known as a fascicle, within a nerve.<br /><br />c. Exoneurium: This term is not commonly used in anatomy and does not refer to a specific connective tissue sheath of the nerve trunk.<br /><br />d. Ectoneurium: This term is not commonly used in anatomy and does not refer to a specific connective tissue sheath of the nerve trunk.<br /><br />Therefore, the correct answer is e. epineurium, which is the outermost layer of connective tissue that surrounds the entire nerve trunk.