Morphological examination of the bulbus oculi and intraorbital muscles (musculi bulbi) in the common buzzard (buteo buteo)

Abstract

In this study, a total of 20 eyeballs belong to 10 adult buzzards (buteo buteo) were examined. Morphometric data of eyeballs and lens were described and value of right and left eyes were evaluated with "paired sample t-test" and significant difference was not found (p >= 0.05). Bony plates described as scleral ossicles were observed in equator region of sclera in histological investigation. Sinusoidal cavities were noticed in bony plates. A cartilage containing chondrocytes and chondroblasts in it in lower part of these bony plates were seen. Intraorbital muscles, dorsal rectus, ventral rectus, nasal rectus, temporal News, dorsal oblique and ventral oblique were responsible for the movement of bulbus oculi. Also, pyramidalis and quadrants muscles that originated from bulbus oculi and attached to nictitating membrane were determined. It was detected that rectus muscles and ventral oblique muscle originated from the surrounding of optic foramen and dorsal oblique muscle originated from nasal part of interorbital septum and attached to sclera. Pyramidalis and quadrants muscles were stated to be attached to sclera and to responsible for the movement of nictitating membrane. Morphometric data and junction formation of the insertion tendon of intraorbital muscle to the sclera were identified.