Onion Peel, Onion Skin
Onion Peel, Onion Skin
These terms have been used to describe the pattern of facial sensory loss with perioral sparing (Dejerine pattern), seen with intramedullary or cervicomedullary lesions and with tabes dorsalis. It reflects the somatotopic sensory representation in the spinal nucleus of the trigeminal nerve: midline face (nose, mouth) represented rostrally, lateral facial sensation represented caudally. The pattern of sensory impairment may also be termed "balaclava helmet."
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