Post-Levator Aponeurosis Fat Pad

Area of Science:

• Anatomy
• Ophthalmology
• Surgical Anatomy

Background:

• The post-levator aponeurosis fat pad is a key anatomical structure in the upper eyelid.
• Understanding its precise superoinferior extension is crucial for ophthalmic and plastic surgery.
• Previous studies have not fully detailed this extension in specific populations like Japanese cadavers.

Purpose of the Study:

• To investigate the superoinferior extent of the post-levator aponeurosis fat pad.
• To document anatomical variations in Japanese cadavers.
• To provide detailed anatomical data for surgical planning.

Main Methods:

• Anatomical dissection of 26 Japanese upper eyelids from 15 cadavers.
• Orbital exenteration followed by sagittal sectioning.
• Microscopic examination of the post-levator aponeurosis fat pad's superoinferior extension.

Main Results:

• Superiorly, the fat pad reached the myotendinous junction of the levator palpebrae superioris (LPS) muscle in 17 eyelids (non-branching LPS).
• In 9 eyelids (branching LPS), the fat pad extended to the LPS muscle's superior and inferior branches.
• Inferiorly, the fat pad reached the conjunctival fornix (13 eyelids) or the tarsal plate (13 eyelids).

Conclusions:

• Significant anatomical variation exists in the superoinferior extension of the post-levator aponeurosis fat pad in Japanese cadavers.
• These findings highlight population-specific anatomical differences.
• The data can inform surgical techniques and improve outcomes in eyelid reconstruction and rejuvenation procedures.