Occular Anatomy Flashcards
What is the Orbit ?
It is the bony cavity in the skull that houses:
The globe of the eye
The muscles that move the eye
The lacrimal gland
and the blood vessels and nerves required to supply these structures.
What is the Globe?
The eye, without it’s surrounding structures. The eyeball.
What structures are in the lacrimal apparatus?
- puncta
- canaliculus
- lacrimal sac
- lacrimal gland
- nasolacrimal sac
What is the puncta?
The tiny opening on the upper and lower eyelid near the nose, through which the tears pass.
What does the lacrimal canaliculus do?
(It is one of 2 small channels that starts at the punctum in the upper or lower lid)
It drains tears from the surface of the eye to the lacrimal sac.
What is lacrimal sac, and what does it do?
The sac that holds tears after they pass through the canaliculi, which empty through the nasolacrimal duct in the nasal cavity.
Where is the lacrimal gland located?
Lateral part of the upper lid.
What does the lacrimal gland do?
It produces the watery substance making up the middle layer of the tear film.
What is the nasosacrimal duct?
The duct through which the tears pass from the lacrimal sac into the nasal cavity.
What are cilia?
The eyelashes.
What does palpebral mean?
Of, or relating to, or located on or near the eyelids.
What does Blepharo mean?
Eyelid or Eyelids.
Where are the meibomian glands ?
These are small glands that run along the edge of the upper and lower eyelid.
What are the purpose of meibomian glands?
Meibomian glands produce oil that is continuously excreted into the tear film. This oil keeps the tears slippery and also forms a protective “evaporation proof” barrier on the surface of the tear film.
What does the Tarsus, or tarsal plate, do?
It’s the dense framework within the middle layer of the eyelid that gives eyelids their firmness and shape.
