VUSCULTURE OF THE EYEBALL

Question 1

nerves of the orbit = optic nerve CN VII

Answer 1

Optic nerve (CN II) special
sensory, optical stimuli

Question 2

nerves of the orbit= OCULOMOTOR CN VIII

Answer 2

Oculomotor nerve (CN III)
motor and parasympathetic
via ciliary ganglion and short
ciliary nerve to the ciliary body
and pupillae constrictor

Question 3

nerves of the orbit= Trochlear nerve (CN IV)

Answer 3

Trochlear nerve (CN IV) motor

Question 4

nerves of the orbit= Abducent nerve (CN VI)

Answer 4

Abducent nerve (CN VI)
motor

Question 5

nerves of the orbit= facial nerve CN VII

Answer 5

Facial nerve (CN VII)
parasympathetic to lacrimal
gland via the pterygopalatine
ganglion and zygomatic nerve

Question 6

Ophthalmic nerve (CN V1)
sensory:

Answer 6

① Frontal nerve
② Nasociliary nerve*
③ Lacrimal nerve

Question 7

Postsynaptic sympathetic
fibers from the superior
cervical ganglion and internal
carotid plexus that travel
through the ciliary ganglion

Answer 7

① The short ciliary nerve to the
ciliary body and intra‐ocular
vessels

Question 8

And not via the ciliary

ganglion

Answer 8

① The long ciliary nerve* to

dilator pupillae

Question 9

arterial supply of the eye

Answer 9

arterial supply to the structures of the orbit including the eyeball is by the ophthalmic artery which branched from the internal carotid artery, it enters the optic canal together with the optic nerve

Question 10

1. lacrimal artery

Answer 10

supply the lacrimal gland, conjunctiva, and eyelids

Question 11

2. central retinal artery

Answer 11

supply the optic retina except for the cones and rods

Question 12

3. the long posterior ciliary arteries

Answer 12

supply the ciliary body of the iris

Question 13

4. the small posterior ciliary arteries

Answer 13

supply cones and rods of the optic retina

Question 14

5. muscular arteries

Answer 14

supply intrinsic muscles of the eyeball

Question 15

6. supraorbital artery

Answer 15

supply the forehead and scalp

Question 16

7. dorsal nasal artery

Answer 16

The dorsal nasal artery à supplies the upper surface of the nose

Question 17

8. anterior ethmoidal artery

Answer 17

supplies the anterior and middle ethmoidal cells, septum, nasal cavity

Question 18

9. posterior ethmoidal artery

Answer 18

supplies the posterior ethmoidal cells

Question 19

10. supra-trochlear artery

Answer 19

supplies the forehead

Question 20

arterial supply is also from the infra-orbital artery a branch from

Answer 20

the third part of the maxillary artery

Question 21

veins of the eyes

Answer 21

 Superior and inferior
ophthalmic veins to the
cavernous sinus

 The central vein of the retina
may drain via the inferior
the ophthalmic vein or directly
to the cavernous sinus

 Vorticose veins drain via
the inferior ophthalmic
veins to the cavernous sinus

 Scleral venous sinus drains
aqueous humor

Question 22

the superior ophthalmic vein is formed by the union of

Answer 22

supra-orbital and angular vein

Question 23

veins communicate with pterygoid plexus of veins

Answer 23

through inferior orbital fissure