Bones of the Orbit

Foramen

A small hole opening

Fossa

A pit or depression

Fissure

Larger valley type opening

Tubercle

Notched area

how much spaces does the eye ball take of the orbital socket?

1/5

What 9 things are in the orbital socket, other than the eyeball?

Six Entraocular muscles (4 rectus muscles and 2 oblique muscles)

Lacrimal gland

Ligaments (attach the eye to the orbit at the nasal and lateral area)

Ophthalmic artery

Levator muscle

Orbital nerves

Blood vessels

Orbital fat (smooth surface for eyeball movement)

Connective tissue (lines, covers, and separates structures)

What are the 8 bones that make up the formation of the orbit?

Maxillary (weakest)

Zygomatic (strongest) (also called malar)

Palatine (smallest)

Frontal

Sphenoid(important and largest, most space)

Ethmoid (paper - thin bone)

Lacrimal

Nasal (not usually grouped as orbital bone)

bones that make up the walls of the orbit, starting with the bones closest to the orbital margin

Roof wall- Frontal and sphenoid

Floor wall- Maxillary, zygomatic, and palatine

Medial wall- Nasal, maxillary, lacrimal, ethmoid, and sphenoid

Lateral wall- zygomatic and sphenoid

4 sinuses that are invoked in the orbital area are

Frontal - In frontal bone, on each side of midline above orbits.

Ethmoid - located in serval air cells in both sides of ethmoid bone, medial to orbits.

Sphenoid - located in body of sphenoid bone, posterior and medial to orbits.

Maxillary- located in each maxillary bones, below orbits

Major openings of the orbit and location (3)

Optic foramen - sphenoid

Superior orbital fissure - sphenoid

Inferior orbital fissure - maxillary

major landmarks of the orbital margin and location (5)

Supra orbital notch - frontal bone for artery or vein

Infraorbital foramen - maximally bones for artery and vein

Lateral orbital tubercle - zygomatic bone

Troclear fossa - frontal bone

Fossa for lacrimal bone - frontal bone

what bone is the most important of the orbit?

Sphenoid, because all communication between the orbit and the rest of the body must pass through or over this bone

protrusion of the globe is called what?

Exophthalmos or proptosis

what orbital bones make up the roof wall?

Frontal and sphenoid

What orbital bones make up the floor wall?

Maxillary, zygomatic, and palatine

what optical bones make up the Medial wall?

Nasal, maxillary, lacrimal, ethmoid, and sphenoid

What optical bones make up the Lateral wall?

Zygomatic and sphenoid

what shape is the orbit?

4 sided pyramid (quadrilateral pyramid)

True or false, the floor wall is the most susceptible to fracture caused by a blow to the eyeball?

True, due to the large sinus cavity in the maxillary bones and the inferior orbital issue.