Page 178 - Edited - Webster HEAD AND NECK - part 1

BOUNDARIES OF THE ORBIT (5)
HN 144

A. THE MEDIAL WALL - VIEWED FROM LATERAL ASPECT (LATERAL WALL REMOVED).

MEDIAL PART OF ORBITAL MARGIN
NASAL
BONE
FRONTAL

OPTIC
ETHMOID CANAL

LACRIMAL LESSER WING
BONE OF SPHENOID
MAXILLA
MAXILLA

The lacrimal bone is a thin flake about the size of a
finger nail and depressed to form a concavity in
favour as the LACRIMAL FOSSA. This contains the
LACRIMAL SAC ( ).

LACRIMAL SAC

B. SCHEMATIC HORIZONTAL NASAL CAVITY
SECTION NASAL BONE
LACRIMAL BONE/LACRIMAL FOSSA
OPTIC AXIS
OF EYE NEITHER THE OPTIC
(SHEET 110) NOR VISUAL AXES OF
THE EYE ( ) CAN BE
EYE PARALLEL WITH THE
E E EYE ANTERO-POSTERIOR
LATERAL T T AXIS OF THE ORBIT:
THE OPTIC AXIS MAKES
WALL OF H H AN ANGLE OF ~25°
ORBIT M M WITH THE ORBITAL
O O AXIS WHEN THE EYE IS
LONG AXIS OF I I IN THE PRIMARY
ORBIT D D POSITION ( ).

BODY OF SPHENOID
C. THE ORBITS ARE TWO
ROUGHLY PYRAMIDAL
BOXES, LYING ON THEIR ~ 90°
>
SIDES WITH THEIR
MEDIAL WALLS
PARALLEL. THE PLANES
OF THEIR LATERAL
WALLS ∴ DIVERGE;
EXTENDED POSTERIORLY,
THE LATERAL WALLS
WOULD INTERSECT AT 90°.

KEW