197

Front 1

BONY ORBIT: ROOF

-formed primarily by what?
-separates the x/y
-lesser wing of sphenoid

Back 1

B. Roof

1. Formed primarily by the orbital part of the frontal bone (separates the
orbit from the anterior cranial fossa); the lesser wing of the sphenoid
forms a small part of the roof posteriorly

Front 2

BONY ORBIT: ROOF

-fossa for the lacrimal gland
-forms anteromedial depression?

-TROCHLEAR SPINE

Back 2

B. Roof

2. The fossa for the lacrimal gland forms a shallow, anterolateral depres-
sion and the trochlear fovea forms a slight, anteromedial depression; the
latter may contain a bony spicule, the trochlear spine

Front 3

BONY ORBIT

MEDIAL WALL

Back 3

C. Medial wall

1. The orbital lamina ofthe ethmoid bone forms most ofthe medial wall;
honeycomblike ethmoidal air cells can be seen through its thin wall

Front 4

BONY ORBIT

FRONTOETHMOIDAL SUTURE
-a/p ethmoidal foramina

Back 4

C. Medial wall

2. The frontoethmoidal suture represents the articulation between the
orbital lamina of the ethmoid bone and the orbital part ofthe frontal bone;
the anterior and posterior ethmoidal foramina are openings near the
anterior and posterior parts ofthe frontoethmoidal suture, respectively

Front 5

BONY ORBIT

LACRIMAL BONE
-posterior lacrimal crest

Back 5

C. Medial wall

3. The lacrimal bone forms part of the medial wall, anterior to the
orbital lamina of the ethmoid bone; it exhibits a vertical ridge, the
posterior lacrimal crest, which borders the fossa for the lacrimal sac
posteriorly

Front 6

BONY ORBIT: MEDIAL WALL

FRONTAL PROCESS OF THE MAXILLA
-anterior lacrimal crest?

Back 6

C. Medial wall

4. The frontal process of the maxilla forms part of the medial wall, ante-
rior to tlie lacrimal bone; it also exhibits a vertical ridge, the anterior
lacrimal crest, which borders the fossa for the lacrimal sac anteriorly

Front 7

BONY ORBIT: MEDIAL WALL

FOSSA FOR THE LACRIMAL SAC
-continous with the?
--this contains the?

Back 7

C. Medial wall

5. The fossa tor the lacrimal sac is a depression between the anterior and
posterior lacrimal crests, and contains the lacrimal sac; the fossa for the
lacrimal sac is continuous inferiorly with the nasolacrimal canal, which
opens into the nasal cavity and contains the nasolacrimal duct

Front 8

BONY ORBIT: FLOOR

ORBITAL SURFACE OF THE MAXILLA

-infraorbital groove

Back 8

D. Floor

1. The orbital surface ofthe maxilla forms most ofthe floor; from poste-
rior to anterior, it exhibits an infraorbital groove and infraorbital canal
which extend forward from the inferior orbital fissure

Front 9

BONY ORBIT: FLOOR

INFERIOR ORBITAL FISSURE
opens:
posteriorly:
at its middle:
anteriorly:

Back 9

D. Floor

2. The inferior orbital fissure is located posteriorly between the orbital
surface ofthe maxilla and greater wing ofthe sphenoid; it opens posteriorly into the pterygopalatine fossa, at its middle into the infratemporal
fossa, and anteriorly into the temporal fossa

Front 10

BONY ORBIT: FLOOR

ORBITAL SURFACE OF THE ZYGOMATIC BONE

-orbital process of the palatine bone

Back 10

The orbital surface ofthe zygomatic bone forms the anterolateral part
ofthe floor and the orbital process of the palatine bone comprises a tiny
portion ofthe floor anterior to the posterior end of the inferior orbital
fissure