Anatomy - Jakirlic

Question 1

What are the first body hairs produced during embryologic development?

Answer 1

Eyebrows

Question 2

Which muscle depresses the eyebrow?

Answer 2

Orbicularis oculi

Question 3

Which muscle raises the eyebrow?

Answer 3

Frontalis

Question 4

What does the procerus muscle do?

Answer 4

Pulls medial portion of the brow inferiorly to produce horizontal furrows over the bridge of nose

Question 5

The superior palpebral sulcus is created by what?

Answer 5

Where the levator aponeurosis inserts into the skin

Question 6

What creates the inferior palpebral sulcus?

Answer 6

Skin tethered to the underlying periosteum

Question 7

What is the average width of the palpebral fissure?

Answer 7

28-30mm

Question 8

What is the average height of the palpebral fissure?

Answer 8

9-10mm

Question 9

Are the eyelashes located anterior or posterior to the meibomian glans?

Answer 9

Anterior

Question 10

What creates the gray line?

Answer 10

The most anterior part of the muscle of Riolan

Question 11

How many cilia are found in the upper eyelid?

Answer 11

100-150

Question 12

How many cilia are found in the lower lid?

Answer 12

50-75

Question 13

What are the types of anterior blepharitis?

Answer 13

Squamous or seborrheic

Staphylococcal or ulcerative

Question 14

What are the types of posterior blepharitis?

Answer 14

MGD (meibomitis)

Question 15

What are the 4 major functions of the eyelids?

Answer 15

Protect globe
Move tears toward drainage
Spread tears
Contain structures that produce tear film

Question 16

Where is the thinnest skin on the body found?

Answer 16

Eyelid

Question 17

What makes up the subcutaneous areolar layer of the eyelid?

Answer 17

Loose connective tissue between skin and orbicularis layer

Question 18

The subcutaneous areolar layer of the eyelid is one of the few places that does not contain what?

Answer 18

Fat

Question 19

What are the 2 portions of the orbicularis?

Answer 19

Orbital

Palpebral

Question 20

What does the orbital portion of the orbicularis do?

Answer 20

Forced closure of the eye

Question 21

What does the palpebral portion of the orbicularis do?

Answer 21

Spontaneous and reflex blinking

Question 22

What are the two parts of the palprbral portion of the orbicularis?

Answer 22

Muscle of Riolan

Muscle of Horner

Question 23

What is the function of the muscle of Riolan?

Answer 23

Keeps lid margin opposed to globe

Question 24

The muscle fibers of the muscle of Horner encircle what?

Answer 24

The canaliculi

Question 25

What is the orbital septum made of?

Answer 25

Dense connective tissue

Question 26

What is the extent of the orbital septum?

Answer 26

Runs the entire orbital rim to the tarsal plates of the eyelids

Question 27

What structure of the eyelid restricts fat from falling onto the lid margins?

Answer 27

Orbital septum

Question 28

Why isn’t the lacrimal sac protected by the orbital septum?

Answer 28

It is anterior to the septum

Question 29

What kind of connective tissue is the tarsal plate?

Answer 29

Dense, irregular CT

Question 30

What are the measurements of the tarsal plate?

Answer 30

1mm thick

29mm long

Question 31

Which muscle retracts the upper eyelid?

Answer 31

Levator

Question 32

Where does the levator originate?

Answer 32

Lesser wing of the sphenoid bone

Question 33

Which nerve innervates the levator?

Answer 33

CN III

Question 34

The fibers of which muscle aponeurosis penetrate the orbital septum?

Answer 34

Levator

Question 35

Which muscle divides the lacrimal gland into orbital and palpebral lobes?

Answer 35

Levator