Download Orbit

Bony orbit
• skeletal cavities located on either side of the
root of the nose
• house the eyes, the paired peripheral organs
of vision.
The walls
• protect the eye from injury
• provide points of attachment for six
extraocular muscles which allow the accurate
positioning of the visual axis
• determine the spatial relationship between
the two eyes, which is essential for both
binocular vision and conjugate eye
movements.
• Each cavity approximates to a quadrilateral
pyramid with its base at the orbital opening,
narrowing to its apex along a posteromedially
directed axis.
• Each orbit has a roof, floor, medial and lateral
walls.
• The medial walls lie approximately 25 mm
apart in adults and are nearly parallel.
• The angle between the medial and lateral
walls is about 45°.
Orbital contents
Orbital fascia