Vertical orientation of the sensory nerve fibres of the upper eyelid. a clinical study

ABSTRACT

Vertically oriented nerve fibres are frequently encountered during upper eyelid surgery Cadaveric dissection and immunohistochemical studies had proved that these nerve fibres are sensory in nature.The present study aimed at proofing the nature of these nerves clinically. Intraoperative electrical stimulation of these fibres resulted in no contraction of the orbicularis muscle while stimulation of the muscle itself showed an obvious consistent contraction. Meanwhile, histological examination of the excised vertically oriented fibres showed they are nerve fibres. This study concluded that the vertically suborbicular nerve fibres are sensory in nature