Powerpoint for Panopto self study recordings 2

Question 1

contents of the bony orbit

Answer 1

Frontal bone
Sphenoid
Lacrimal
Ethmoid
Maxillary
Zygomatic
Optic foramen
Superior Orbital fissure
Inferior orbital fissure

Question 2

true or false: the medial and inferior walls of the orbit are particularly strong

Answer 2

false weak

Question 3

AP length of eyeball

Answer 3

24mm

Question 4

AP length of orbit

Answer 4

40m

Question 5

function of the lids

Answer 5

skin on the outside, mucous membrane on the inside (conjunctiva)

Question 6

what type of glands to eyelashes have?

Answer 6

sebaceous

Question 7

what are the oily secretory glands for?

Answer 7

tear film

Question 8

what is conjunctiva?

Answer 8

thin vascular membrane that covers inner surface of the eyelids and loops back over sclera

Question 9

does the conjunctiva cover the cornea?

Answer 9

no

Question 10

where is the lacrimal gland situated?

Answer 10

in the orbit laterally

Question 11

what innervates the lacrimal gland?

Answer 11

facial nerve

Question 12

where does the lacrimal gland open into?

Answer 12

conjunctival sac

Question 13

what are the events of tears?

Answer 13

During each blink, eyelids spread tears evenly on the surface of cornea

Tears drain through punctae on the medial side of each eyelid

Drains into lacrimal sac which sits over the lacrimal bone

Then drains through nasolacrimal duct into the inferior meatus of the nasal cavity.

Question 14

function of intrinsic ocular muscles

Answer 14

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

Question 15

function of the extrinsic ocular muscles

Answer 15

move the eye.

Question 16

what are the intrinsic eye muscles?

Answer 16

ciliaris muscle and contrictor pupillae by parasympathetic III

dilator pupillae by sympathetic plexus

Question 17

what are the extrinsic ocular musclesthat move the eye?

Answer 17

4 Straight muscles called recti
Medial rectus (MR)
Lateral rectus (LR)
Inferior rectus (IR)
Superior rectus (SR)

2 oblique muscles
Superior Oblique (SO)
Inferior Oblique (IO)

Question 18

where does the recti muscles arise from?

Answer 18

the apex of the orbit from an annular fibrous ring

Question 19

where does the superior oblique muscle arise from?

Answer 19

roof of the orbit posteriorly

Question 20

where does the inferior oblique muscle arise from?

Answer 20

floor of the orbit anteriorly

Question 21

what is the levator palpebrae superioris?

Answer 21

situated above the SR, its a muscle running to the upper eyelid to elevate it

Question 22

where do the recti mucles insert onto the sclera?

Answer 22

anteriorly

Question 23

where do the obliques insert onto the sclera?

Answer 23

posteriorly

Question 24

origin of the LPS?

Answer 24

roof of orbit

Question 25

origin of all recti?

Answer 25

tendinous ring

Question 26

origin of SO

Answer 26

lesser wing of sphenoid

Question 27

insertion of SO

Answer 27

sclera posteriorly

Question 28

origin of IO

Answer 28

medial part of orbit floor

Question 29

insertion of IO

Answer 29

sclera posteriorly

Question 30

innervation of trochlea

Answer 30

trochlear IV

Question 31

innervation of abducts LR

Answer 31

abducent VI

Question 32

innervatio of everything else in the eye?

Answer 32

oculomotor III

Question 33

function of optic II nerve?

Answer 33

carries visual impulses from the eyeball. leaves orbit through optic foramen

Question 34

function of the oculomotor nerve?

Answer 34

supplies all the muscles going to the eye except 2 and also supplies levator muscle of the eyelid

it carries parasympathetic fibres which synapse at the ciliary ganglion in the orbit

Question 35

function of the abducent nerve VI

Answer 35

suppllies just one muscle- the lateral rectus

Question 36

function of the trochlear nerve IV

Answer 36

arises from the dorsal part of the midbrain and supplies just one muscle- superior oblique