week 3 anatomy

Question 1

how long is the bony orbit?

Answer 1

8cm

Question 2

what part of the sphenoid bone forms part of the bony orbit?

Answer 2

wings

Question 3

what are 4 structures of note in the bony orbit?

Answer 3

optic foramen
superior orbital fissure
inferior orbital fissure
infra orbital groove

Question 4

where does the optic nerve pass through?

Answer 4

optic nerve

Question 5

where does the opthalmic artery pass through?

Answer 5

opthalmic artery

Question 6

what passes through the superior orbital fissure?

Answer 6

branches of opthalmic and

motor nerves to the eye (III IV VI)

Question 7

what passes through the inferior orbital fissure?

Answer 7

maxillary division of cranial nerve V

Question 8

what cranial nerves innervate the muscles of the eye?

Answer 8

III
IV
VI

Question 9

how many muscles move the eyeball?

Answer 9

6

Question 10

what forms the fibrous coat of the eyeball?

Answer 10

cornea

sclera

Question 11

what forms the vascular coat of the eyeball?

Answer 11

iris
ciliary body
choroid

Question 12

what forms the sensory coat of the eyeball?

Answer 12

retina

Question 13

where is the aqueous humor located?

Answer 13

lens

Question 14

what is the choroid rich in?

Answer 14

vasculature

Question 15

what does the ciliary body do?

Answer 15

suspends the lens and produces aqueous humour

Question 16

what is the function of the iris?

Answer 16

controls diameter of pupil

Question 17

what is the function of the choroid?

Answer 17

supplies blood to outer layers of retina

Question 18

what is the function of the retina?

Answer 18

contains light sensitive rods and cones which enable vision

Question 19

what is the vitrous humor?

Answer 19

transparent gel posterior to the lens.

Question 20

what is the function of the intrinsic ocular muscles?

Answer 20

control pupil diameter and helps alter lens curvature to enable us to see near objects

Question 21

what is the function of the extrinsic ocular muscles?

Answer 21

move the eye

Question 22

what are the intrinsic ocular muscles?

Answer 22

ciliaris muscle
constrictor pupillae
dilator pupillae

Question 23

what branch of the autonomic nervous system innervates the intrinsic eye muscles?

Answer 23

ciliaris - parasympathetic
constrictor pupillae - parasympathetic
dilator pupillae - sympathetic

Question 24

what are the 2 types of muscles in the extrinsic ocular muscles?

Answer 24

straight and oblique muscles?

Question 25

what are the 6 extrinsic ocular muscles?

Answer 25

``` medial rectus (S) lateral rectus (S) inferior rectus (S) superior rectus (S) superior oblique (O) inferior oblique (O) ```

Question 26

what innervates the superior oblique

Answer 26

cranial nerve IV

Question 27

what innervates the lateral rectus?

Answer 27

cranial nerve VI

Question 28

what innervates every extrinsic ocular muscle apart from the medial and lateral rectus muscles?

Answer 28

cranial nerve III

Question 29

where does the lacrimal gland lie?

Answer 29

laterally in the orbit

Question 30

what innervates the lacrimal gland?

Answer 30

facial nerve

Question 31

where do the lacrimal ducts open into?

Answer 31

the conjunctival sac

Question 32

where does the lacrimal sac drain into?

Answer 32

inferior meatus of nasal cavity

Question 33

what muscles are contained in the middle ear

Answer 33

tensor tympani | stapedius

Question 34

what part of the temporal bone do the middle and inner ear lie in?

Answer 34

petrous part

Question 35

what foramen do cranial nerves VII and VIII pas through?

Answer 35

internal acoustic foramen