Final answer:
The palatine bone forms part of the floor of the orbit in lemurs and plays a role in eye protection alongside other orbit bones. It highlights the significance of vision in primates.
Step-by-step explanation:
The bone that partially encases the eye orbit and is found in lemurs is the palatine bone. This bone forms a small area in the floor of the orbit, as part of the facial skeleton. The orbit is a cone-shaped bony socket that not only houses the eyeball but also contains the muscles that facilitate eye movement and the opening of the upper eyelid. The many bones that contribute to the structure of the orbit work together to protect the eye and support its function. The protection offered by the bony orbit and the large size of the occipital lobe, which processes visual information, underscores the importance of vision to primates such as lemurs.
In human anatomy, the supraorbital and infraorbital foramina are openings that allow sensory nerves to pass through, supplying the forehead and the anterior face below the orbit respectively. These foramina are also situated in the bony structures that surround the orbit, contributing to the complex anatomy dedicated to protecting and facilitating vision.