Fundamentals Vol. 3 Flashcards Preview

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Flashcards in Fundamentals Vol. 3 Deck (35):
1

How many tarsal meibomian gland orifices are located in the upper eyelid? Lower eyelid?

Upper eyelid - 30 to 40 Lower eyelid - 20 to 30

2

Where is the marginal arterial arcades of the eyelids located?

3 mm from the eyelid margin

3

Where does the pretarsal portion of the venous system of the eyelid drain? Posttarsal system?

Pretarsal- internal and external jugular veins Posttarsal - cavernous sinus

4

Where do the medial group of eyelid lymphatic vessels drain? Lateral group?

Medial groups- Submandibular lymph nodes Lateral group - Preauricular lymph nodes

5

What type of epithelium covers the caruncle?

Nonkeratinized, stratified squamous epithelium

6

What does the caruncle contain?

Sebaceous glands

7

What does the epithelium of the plica semiluminaris contain?

Goblet cells

8

What does the stroma of the plica semiluminaris contain?

Fat and nonstriated muscle

9

What structure divides the main lacrimal gland into two parts?

Levator aponeurosis

10

What are the two lobes of the lacrimal gland?

Orbital and palpebral lobe

11

How many ducts drain into the conjunctival fornix from the main lacrimal gland?

Approx. 12

12

Where do the ducts from the main lacrimal gland drain in the conjunctival fornix?

Approx. 5 mm above the superior margin of the tarsus

13

On what lobe the main lacrimal gland is biopsy typically performed?

Orbital lobe (in order to spare the drainage ducts of the lacrimal gland)

14

What are the 2 main type of cells located within the lacrimal glands?

1. Acinar cells 2. Myoepithelial cells

15

Which type of cells line the lumen of the lacrimal glands?

Acinar cells (surrounded by myoepithelial cells)

16

What artery supplies the main lacrimal gland?

Lacrimal artery (branch of ophthalmic artery)

17

What is the sensory innervation of the lacrimal gland?

Lacrimal nerve (CN V1)

18

What is the average diameter of the lacrimal puncta?

0.3 mm

19

Where is the inferior lacrimal punctum located?

6.5 mm from the medial canthus

20

Where is the superior lacrimal punctum located?

6.0 mm from the medial cantus

21

What type of epithelium lines the lacrimal puncta and canaliculi?

Stratified squamous, nonkeratinized epithelium

22

Where does epithelium of the lacrimal drainage system separate into 2 layers?

Near the lacrimal sac

23

What are the 2 layers of the epithelium of the lacrimal sac?

1. Superficial columnar layer 2. Deep, flattened cell layer

24

What are the 3 portions of the conjunctiva?

1. Palpebral 2. Fornical 3. Bulbar

25

What is the blood supply to the bulbar conjunctiva?

Anterior ciliary arteries

26

Where is the vascular watershed of the conjunctiva located?

Approx. 3 to 4 mm from the limbus

27

Where are the goblet cells of the conjunctiva concentrated?

Inferior and medial portions of the conjunctiva (esp. near the caruncle)

28

Where on the conjunctiva are goblet cells absent?

Limbal region of the conjunctiva

29

What is the anterior attachment of Tenon capsule?

Intramuscular septum (3 mm posterior to limbus)

30

What 3 tendons form the suspensory ligament of Lockwood?

1. Inferior rectus muscle. 2. Inferior tarsal muscle 3. Check ligaments of the medial and lateral rectus muscle

31

What vessel forms the intramuscular circle of the iris?

Posterior ciliary vassel

32

What vessel forms the intramuscular circle of the iris?

Posterior ciliary vessel

33

What veins drain the choroid, ciliary body, and iris?

Vortex veins

34

Where is the ampulla of the vortex veins located?

8 to 9 mm from the ora serrata

35

What structure divides the central or posterior fundus from the peripheral portion?

Circle formed by the ampulla of the vortex veins