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Washington University Experience | PERIPHERAL NEUROPATHY | 1 NORMAL NERVE ANATOMY | 6 Infant Peripheral Nerve | 5A1 Sciatic nerve (Case 5) 21 wk fetus sciatic H&E 2

Case 5 History (Bilbao & Schmidt (2015) 9wk effective age) Peripheral sciatic nerve from a 33-week preterm infant surviving 16 additional weeks (thus, effectively a 9-week-old) shows a monomorphic population of myelinated axons at higher density, and including axons with thinned myelin for axon caliber. ---- 5A1-3 This is an unusual nerve in which there is fascicle-to-fascicle variability in the populations of myelinated axons. (Toluidine blue-stained one-micron thick plastic-embedded section)

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