Flashcards in Orbit And eye Deck (108)
What does the orbit contain?
-SO MUCH fat
What are the orbits
A pair of bony cavities
What is the shape of the orbit?
Base in front
Roof of orbit
Orbital plate of the frontal bone
Lateral wall of the orbit
Formed by the zygomatic bone and the greater wing of the sphenoid
Floor of the orbit
Formed by the orbital plate of the maxilla, which separates the orbital cavity from the maxillary sinus
Medial wall of the orbit
Formed by the frontal process of the maxilla, lacrimal bone, orbital plate of the ethmoid, and the body of sphenoid
What is the purpose of eyelids?
Protect the eye from injury and excessive light
Upper eye lid
Larger and more mobile than the lower lid
Where do both eyelids meet?
At the medial and lateral angles
The opening between the eyelids and the entrance into the conjunctival sac
What is the superficial surface of the eyelid covered in?
What is the deep surface of the eyelid covered with?
mucous membrane called the conjunctiva
How are the eyelashes arranged?
In double or triple rows at the mucocutaneous junction
What kind of glands open into the eyelash follicles?
Modified sebaceous glands that open into the margin of the eyelid behind the eyelashes
What do tarsal glands secrete?
Oily substance which prevents the overflow of tears
Thin mucous membrane that lines the eyelids and is reflected at the superior and inferior cornices onto the anterior surface of the eyeball
What is continuous with the cornea?
Epithelium of the conjunctiva
The conjunctiva creates this, which opens at the palpebral fissure
What ar the eyelids supported about
Fibrous sheet called the orbital septum
What is attached to the periosteum at the orbital margins
What forms the tarsal plates?
The orbital margins thicken to form it
What is embedded in the tarsal plate
What consists of a large orbital part and a small palpebral part, which are continuous with each other?
Where is the locational gland located
Above the eyeball in the upper lateral and anterior aspect of the orbit
How many ducts are in the lacrimal gland?
Where do the ducts of the lacrimal gland open
Into the lateral part of the superior fornix of the conjunctiva
What are the two parts of the lacrimal gland
Large orbital part and a small palpebral part, which are continuous with each other