Infraorbital region deep fat compartment

View onto the right and left infraorbital region of layer four (deep to the OOM) in a female (A) and male (B) fresh-frozen specimen.
(A) The PZ and the DLCF are circled. The arrowhead indicates the zygomaticus major muscle with its broadly based fibrous origin. This long attachment represents the lateral-inferior boundary of the DLCF. The facial vein is marked by the arrows and represents the medial-inferior boundary of the DLCF. The OOM is flipped toward the nose to expose the BB where this muscle attaches on the orbital rim.
(B) Dyer has been injected into the PZ (red and blue) and into the DLCF (green). Note that the injection was performed with constant contact to the bone during application in all three locations. The red and blue areas correspond to the MS and to the LS. The arrowhead indicates zygomaticus major muscle with its broadly based fibrous origin; BB area after sharp removal of the OOM from its attachment on the orbital rim. The asterisk marks the levator labii superioris alaeque nasi muscle. The arrows point to the facial vein.