NEET 2015
- Exam
- NEET
- Year
- 2015
- Subject
- Zoology
- Chapter
- Neural Control and Coordination
NEET 2015 · Zoology · Neural Control and Coordination
In the mammalian eye, the 'fovea' is the the center of the visual...
In the mammalian eye, the 'fovea' is the the center of the visual field, where:
Options
- AThe optic nerve leaves the eye
- BOnly rods are present
- CMore rods than cones are found
- DHigh density of cones occur, but has no rods
Correct answer
D. High density of cones occur, but has no rods
Step-by-step solution
Area centralis of the retina: A little part of the retina that lies upon the optical axis is called area centralis. Here, the retina is very thin and contains only cone cells. This part is called a yellow spot or macula lutea. In man, this area has a small shallow depression called fovea centralis. The latter is the most sensitive part of an eye, i.e. the area of most acute vision. It is also claimed that the cone cells in fovea centralis are placed somewhat obliquely. So that these can form magnified images of the object.