Orbit and Eyelids

Question 1

Layers of upper eyelid

Answer 1

1. skin
2. obicularis oculi
3. septum
4. preaponeurotic fat
5. levator aponeurosis
6. Mullers muscle
7. conjunctiva

4-5-7 rule

Lower 5mm:

1. skin
2. obicularis oculi
3. tarsus
4. conjunctiva

Mid 5mm:

1. skin
2. obicularis oculi
3. levator aponeurosis
4. tarsus
5. conjunctiva

Above 10mm:

1. skin
2. obicularis oculi
3. septum
4. preaponeurotic fat
5. levator aponeurosis
6. mullers muscle
7. conjunctiva
   8.

Question 2

Layers of lower eyelid

Answer 2

1. skin
2. obicularis oculi
3. septum
4. pre capsulopalpebral fascia fat
5. inferior sympathetic muscle
6. capsulopalpebral fascia
7. conjunctiva