Special senses 1

1. Which is the avascular part of the eye?

Cornea / lens

2. What is the area between the lens and the retina filled with?

Vitreous humour

3. What is the clear liquid that nourishes the cornea and lens?

Aqueous humour

4. What structure in the body produces aqueous humour?

Ciliary body

 

5. Which part of the retina is densely packed with cone-receptors?

Fovea centralis

6. What is the rod-free portion of the retina in the humans called?

Fovea centralis

7. What are eyes with normal vision called?

Emmetropic eye

8. What is the electrical activity produced when light stimulates the photoreceptors (cone)?

Hyperpolarization

9. Which part of the thalamus is the relay station for the visual pathway?

Lateral geniculated body

10. Where in the brain is the prmary visual sensory area located?

Occipital lobe Brodmann’s area 17 primary visual cortex

11. How many visual receptors are located in the region of the optic disk?

Receptors are absent

12. What types of receptors are responsible for acuity of vision?

Cones

13. What is the process by which the curvature of the lens is increased?

Accommodation

14. What is the loss of accommodation in normal individuals reaching the age 40-45 years?

Presbyopia

15. What is the condition when the light reflex is lost, while the accommodation remains intact?

Argyll Robertson pupil

16. What is the site of lesion in the condition causing Argyll Robertson pupil?

Lesion in the pretectal nucleus

17. What is the medical term used for squint?

Strabismus

18. What is the corrective lens prescribed to correct astigmatism?

Cylindrical lens

19. Tumour of which endocrine gland would lead to bitemporal hemianopsia?

Tumour of the pituitary glands

20. What is the normal loss of hearing due to ageing called?

Presbycusis

21. Which receptors are stimulated during angular acceleration (Merry-go round Feris wheel)?

Hair cells of the semicircular canals

22. When you are blindfolded and made to stand in an elevator and the elevator moves, which receptors are stimulated that makes understand the direction of movement?

Linear acceleration stimulates the receptors in saccule and utricle.

23. What is shifting of the eye from photopic to scotopic vision called?

Purkinje shift / Purkinje phenomenon

 ( UMS, 2008 )