Page 172 - Edited - Webster HEAD AND NECK - part 1

BOUNDARIES OF THE ORBIT (2) HN141-PART2

In higher primates, The ORBIT IS CUT OFF FROM THE TEMPORAL FOSSA BY A LATERAL
EXTENSION OF THE GREATER WING OF THE SPHENOID BONE.

ANTERIOR VIEW

CRANIAL
CAVITY

TEMPORALIS MUSCLE IN
ORBITAL PLATE TEMPORAL FOISA.
(FRONTAL BONE)
ETHMOID
NO CONTINUITY (R) (L) CONTINUITY BETWEEN
BETWEEN TEMPORAL TEMPORAL FOSSA & ORBIT.
FOSSA & ORBIT ZYGOMA

GREATER WING OF SPHENOID
BEHIND EYE MAXILLA
(REMOVED). NOTE GAP BETWEEN
ITS LOWER BORDER & UPPER
SURFACE OF MAXILLA-THE K.E.W. NASAL CAVITY
INFERIOR ORBITAL FISSURE.

SUPERIOR VIEW
POSITION OF ETHMOID
MAXILLA
GREATER WING OF SPHENOID
ZYGOMA SEPARATES ORBIT & TEMPORAL
FOSSA
B = BASI-SPHENOID

TEMPORALIS MUSCLE
BASI-
occip.
L
(L) FOR. (R)
MAGNA

SQUAMOUS
TEMPORAL OCCIPITAL

REMEMBER THAT THE GREATER WING OF THE SPHENOLD MAKES IMPERFECT
CONTACT WITH THE MAXILLA BELOW (SHEETS THE CONTINUITY BETWEEN INFERIOR
ORBIT AND INFRA-TEMPERAL FOSSA IS THEREFORE ONLY NARROWED (TO A FISSURE
- THE INFERIOR ORBITAL FISSURE), NOT OBLITERATED. (SEE UPPER FIGURE).