Figure Legends
Fig.1. Photomacrograph of the eye of Egyptian agama, Trapelus mutabilis (a) and Scanning electron micrograph (b, c, d) showing the upper eyelid (Ue) with superior extension (star), lower eyelid (Le), polygonal scales (arrow), skin sense organ (white arrowhead), and micro-ornamentation of honeycomb-like scales (black arrowhead).
Fig.2. Scanning electron micrograph of the upper and lower eyelid of Egyptian agama, Trapelus mutabilis showing (a, b, c) the micro-ornamentation of honeycomb-like scales (black arrowhead) wit skin sense organ (white arrowhead).
Fig.3. Photomicrograph of eyelids of Egyptian agama, Trapelus mutabilis , showing (A) complete cross section of the Egyptian agama’s eye; (U1, U2, U3) the structure of the upper eyelid and (S1, S2) its superior extension;
Fig.4. Photomicrograph of eyelids of Egyptian agama, Trapelus mutabilis , showing (A) complete cross section of the Egyptian agama’s eye; (L1, L2, L3) the structure of the lower eyelid and (C1, C2) conjunctiva surface.
Fig.5. Photomicrograph of nictitating membrane of Egyptian agama,Trapelus mutabilis , showing; (a) the location of the small third eyelid (Nm) related to lacrimal (Lg) and harderian gland (Hg) and sclera ossicles (So); (b) scanning electron micrograph of the surface of nictitating membrane (Nm) has many folds marked by crypt-like structures, and pores of lacrimal gland (zigzag arrow); (c, d,e) photomicrograph of the transverse section of the nictitating membrane showing external surface ( E) and internal surface (I) and its cartilaginous support (Ce)
Fig.6. Photomacrograph of the eye’s dissection of Egyptian agama,Trapelus mutabilis , after removing the skin of the upper eyelid to show the dorsalis rectus muscle (Drm), dorsalis oblique muscle (Dom) and depressor palpebral inferioris muscle (Dpim).
Fig.7. Photomacrograph of the eye’s dissection of Egyptian agama,Trapelus mutabilis , after cutting the dorsalis rectus muscle (Drm), dorsalis oblique muscle (Dom), depressor palpebral inferioris muscle (Dpim) to show the medialis rectus muscle (Mrm), tendon of bursalis muscle (star) and position harderian gland (Hg), ventralis rectus muscle (Vrm), ventralis oblique muscle (Vom), lateralis rectus muscle (Lrm), harderian gland (Hg), retractor bulbi muscle (Rbm), tendon of bursalis muscle (star), lower eyelid (Le), and the originate sites of these muscle on eyeball and interorbiral septusm.
Fig.8. Photo of eye of Egyptian agama, Trapelus mutabilis , showing the different actions; the elevation and depression of upper and lower eyelid respectively (opening phase) (black arrow); the down action of upper (green arrow) and up action of lower eyelid (red arrow) via the contraction the orbicularis oculi muscle (closure phase); the adduction and rotation of the eye ball toward the nasal canthus (blue arrow) via contraction of medialis rectus muscle; the abduction and rotation of the eye ball toward the nasal canthus (yellow arrow) via contraction of lateralis rectus muscle; the depression action of eyeball via contraction of ventralis rectus and oblique muscle (white arrow); the elevation action of eyeball via contraction of dorsalis rectus and oblique muscle (orange arrow); and the action of retractor bulbi and bursalis muscle (star) yielding the pulling the eyeball inward the socket.