MCQs - Structure and function of the eye

Question 1

Corneal collagen fibrils have a diameter of around:

a. 3 to 5 nm
b. 20 to 25 nm
c. 200 to 205 nm
d. 500 to 505 nm

Answer 1

Corneal collagen fibrils have a diameter of around:

b. 20 to 25 nm

Question 2

2. The Meibomian gland is a modified:

a. Salivary gland
b. Serous gland
c. Apocrine gland
d. Sebaceous gland

Answer 2

The Meibomian gland is a modified:

Sebaceous gland

Question 3

3. The lens protein alpha crystallin is a:
   a. Modified enzyme
   b. Facilitator molecule
   c. Modified hormone
   d. Chaperone molecule

Answer 3

The lens protein alpha crystallin is a

d. Chaperone molecule

Question 4

Question 4
Myocilin is also known as:

a. Glaucoma associated adaptable inducer protein
b. Glaucoma associated inducible protein
c. Trabecular meshwork adaptable protein
d. Trabecular meshwork inducible glucocorticoid response protein

Answer 4

Myocilin is also known as

The correct answer is: Trabecular meshwork inducible glucocorticoid response protein

Question 5

Question 5
The lacrimal gland is innervated by:

a. Parasympathetic fibres from the nucleus of the facial nerve in the pons
b. Sympathetic fibres from the vago-sympathetic trunk
c. Sympathetic fibres from the trigeminal nerve from Meckel’s cave
d. Parasympathetic fibres of the trigeminal nerve from the gasserian ganglion

Answer 5

The lacrimal gland is innervated by

a.Parasympathetic fibres from the nucleus of the facial nerve (VII = 7) in the pons

The correct answer is: Parasympathetic fibres from the nucleus of the facial nerve in the pons

Question 6

Question 6
The vitreous humour is composed of:

a. Hyaluronic acid and type II collagen
b. Hyaluronic acid and type IV collagen
c. Dermatan sulphate and type IV collagen
d. Dermatan sulphate and type II collagen

Answer 6

The vitreous humour is composed of

a.Hyaluronic acid and type II collagen

Question 7

Question 7
Rhodopsin is called ‘visual purple’ because

a. It predominantly absorbs light of purple wavelengths
b. It predominantly absorbs light of green-blue wavelengths
c. It was first discovered in purple shellfish
d. It is particularly concentrated in purple dye from murex snails

Answer 7

Rhodopsin is called ‘visual purple’ because

b. It predominantly absorbs light of green-blue wavelengths

The correct answer is: It predominantly absorbs light of green-blue wavelength

Question 8

Question 8
The optic nerve is composed of

a. General somatic afferent fibres running through the optic canal
b. General somatic afferent fibres running through the orbital fissure
c. Special somatic afferent fibres running through the optic canal
d. Special somatic afferent fibres running through the orbital fissure

Answer 8

The optic nerve is composed of

Special somatic afferent fibres running through the optic canal

The correct answer is: Special somatic afferent fibres running through the optic canal(c.)

Question 9

Question 9
The extraocular muscles which are not innervated by the oculomotor nerve are
Select one:
a.The ventral rectus and levator palpebrarum superioris
b.The retractor oculi and levator palpebrarum superioris
c.The retractor oculi, dorsal oblique and lateral rectus
d.The dorsal oblique and medial rectus

Answer 9

The extraocular muscles which are not innervated by the oculomotor nerve are:

c. The retractor oculi, dorsal oblique and lateral rectus

The correct answer is: The retractor oculi, dorsal oblique and lateral rectus

Question 10

Question 10
The aqueous humour has a refractive index of around

a. 0.95
b. 1.55
c. 1.33
d. 1.05

Answer 10

The aqueous humour has a refractive index of around

1.33