Layers of the Eyelids

Question 1

Lamella

Answer 1

Layers

Question 2

Anterior lamella of the eyelid

Answer 2

Includes the skin and the orbicularis oculi muscle (Just beneath the skin)

Question 3

Middle lamella of the eyelid (not present in the area of the tarsal plate)

Answer 3

1. Orbital septum
2. retractor muscles
   - Levator is voluntary
   - Muller’s (tarsal) muscle is involuntary
   - Capsulopalpebra fascia

Question 4

Posterior lamella of the eyelid

Answer 4

Tarsal plate and palpebral conjunctiva

Question 5

Anterior and posterior lamella divided by the gray line

Answer 5

Located between the meibomian gland openings and eyelashes. Surgical landmark for the anterior border of riolan’s muscle.

Question 6

What structures are present in the eyelid margin

Answer 6

Eyelashes, lacrimal papilla/puncta, mucocutaneous junction, lid wiper region, and meibomian gland orfices.

Question 7

Where are eyelashes located

Answer 7

In the ciliary portion of the eyelid margin. They are arranged in double or triple row with 2x more in the upper lid than the lower lid.

Question 8

When re eyelashes replaces

Answer 8

Every 5 months and grow to full size in 10 weeks.

Question 9

Function of eyelashes

Answer 9

To protect the eye with a blink reflex. Richly supplied with nerves which makes them very sensitive to the slightest touch.

Question 10

Glands of Zeis

Answer 10

Holocrine sebaceous glands found with the eyelashes. Coat the eyelash shaft to keep it from becoming brittle. Also keeps the eyelid margin lubricated.

Question 11

Gland of Moll

Answer 11

Apocrine, sweat glands that secrete sweat into the eyelash hair follicle or directly on the lid margin. Function is unknown. Possibly immune defense.

Question 12

Special sebaceous and sweat glands of the eyelashes

Answer 12

Sebaceous- Glands of Zeis

Sweat- Glands of Moll

Question 13

Difference between merocrine, apocrine, and holocrine secretion

Answer 13

Merocrine secrete vesicles
Apocrine cells secrete a pinched off portion of the cell’s apex.
Holocrine cells secrete their entire selves along with the product.

Question 14

What type of gland is Glands of zeis

Answer 14

Holocrine. The entire cell and its sebum is secreted.

Question 15

What type of gland is gland of Moll

Answer 15

Apocrine. Only the apex and product is secreted

Question 16

How can you tell if someone has a cyst of the glands of zeds or glands of moll?

Answer 16

Glads of zeis will appear yellow since it secretes oil. Glands of Moll will appear clear since they secrete sweat, which is mostly water.

Question 17

Lacrimal papilla/puncta

Answer 17

The lacrimal papilla is a slight elevation of tissue present at the medial portion of the UL and LL. In the center is a hole called the puncture. This is the beginning of the nasolacrimal drainage system.

Question 18

What hole is the beginning of the nasolacrimal drainage system?

Answer 18

The lacrimal papilla/puncta on the medial upper and lower lid.

Question 19

Mucocutaneous junction (line of marx)

Answer 19

Present in the ciliary and lacrimal portion of the eyelid margin. Transmition zone between the palpebral conjunctiva and skin.

Question 20

Lid wiper region

Answer 20

Present in the ciliary and lacrimal portion of the eyelid margin. Elevated strip of palpebral conjunctiva just posterior to the mucocutaneous junction. Comes into contact with the globe during blinking.

Question 21

Meibomian gland orfices

Answer 21

Present in the ciliary portion of the eyelid margin located in a row along the eyelid margin. Secretes oils (lipids) onto the skin just infant of the mucocutaneous junction.

Question 22

Meibomian glands secrete

Answer 22

Meibum

Question 23

On the margin of the eyelids, where is and where aren’t meibomian glands?

Answer 23

Meibomian glands are only present in the ciliary portion of the eyelid margin in a row. There are no glands located medially near the lacrimal portion.