Question

The odd tingling sensation in BN's face and lips could indicate that the axons of his sensory neurons are impaired. If a contaminant from seafood is responsible, which is the correct order of connective tissue sheaths that the contaminant would have to pass through in order to reach individual axons?

Answer 1

Answer: epinerium, perineurium, endoneurium
In this case, the contaminant should first pass through the epinerium, which surrounds the total bundle of nerve fibers in the fascicles. Then goes through the perineurium, a fibrous sheath that surrounds and protects each fascicles and fill each spaces between these fascicles and lastly the endoneurium, a fine connective tissue sheath that is in the inner layer that surround and cover individual muscle fiber and finally reach the individual axons.