Ct anatomy of orbit

M A A J I D M O H I U D D I N M A L I K
L E C T U R E R C O P M S A D E S H U N I V E R S I T Y
B A T H I N D A , P U N J A B
ma a j i d ma l i ko f f i c i a l @ g ma i l . c o m
CT ANATOMY OF ORBIT
MAAJIDMALIKOFFICIAL@GMAIL.COM

INTRODUCTION
By definition, the orbit (bony orbit or orbital cavity) is a
skeletal cavity comprised of seven bones situated within
the skull. The cavity surrounds and provides mechanical
protection for the eye and soft tissue structures related
to it.

CONTINUE
The bones that make up the orbit contain several
foramina and fissures through which important
neurovascular structures (such as the optic nerve (CN
II)) pass through on their way from the brain to the eye
and face and vice versa.

BONES
 Maxilla
 Frontal bone
 Zygomatic bone
 Ethmoid bone
 Lacrimal bone
 Sphenoid bone
 Palatine bone
NOTE:
Mnemonic: Many Friendly Zebras Enjoy Lazy Summer Picnic

WALLS
 Roof (superior): Orbital part of the frontal bone, lesser
wing of the sphenoid bone
 Medial: Orbital plate of the ethmoid bone, lacrimal bone,
frontal process of the maxilla, greater wing of the sphenoid
bone
 Floor (inferior): Orbital surface of the maxilla, zygomatic
bone, palatine bone
 Lateral: Zygomatic bone, sphenoid bone

LANDMARKS AND OPENINGS
Optic foramen (canal),
Lacrimal fossa
Lacrimal groove
Anterior and posterior ethmoidal foramina
Trochlea
Superior and inferior orbital fissures

CONTENT OF THE ORBIT
Eyeballs
Orbital fascia
Orbital fat
Extraocular muscles
Neurovasculature
Lacrimal apparatus

CT ANATOMY OF
ORBIT

1. GREATER WING OF SPHENOID 2. ZYGOMATIC
BONE 3. FRONTAL BONE.

1, OPTIC CANAL 2, GREATER WING OF
SPHENOID 3, ZYGOMATIC BONE 4, FRONTAL BONE.

1, SELLA TURCICA. 2, SUPERIOR ORBITAL FISSURE. 3, GREATER
WING OF SPHENOID. 4, ZYGOMATIC BONE. 5, LAMINA OF THE
ETHMOID BONE. 6, ETHMOIDAL CELLS.

1, SUPERIOR ORBITAL FISSURE. 2, OPTIC NERVE. 3, MEDIAL
RECTUS MUSCLE. 4, LAMINA OF THE ETHMOID BONE.

1, SUPERIOR ORBITAL FISSURE. 2, ZYGOMATIC
BONE. 3, GLOBE. 4, GREATER WING OF SPHENOID. 5, DORSUM
SELLAE.

1, SPHENOID BONE. 2, SUPERIOR ORBITAL
FISSURE. 3, SPHENOTEMPORAL SUTURE. 4, SPHENOZYGOMATIC
SUTURE. 5, LAMINA PAPYRACEA OF THE ETHMOID BONE. 6, SPHENOIDAL
SINUS

1, SPHENOID BONE. 2, LACRIMAL BONE. 3, NASAL
BONE. 4, SUPERIOR ORBITAL FISSURE.

1, SPHENOIDAL SINUS. 2, ETHMOIDAL
CELLS. 3, CAROTID CANAL.

1, FORAMEN ROTUNDEM. 2, ZYGOMATIC BONE. 3, MAXILLARY
BONE. 4, NASAL BONE. 5, INFERIOR ORBITAL
FISSURE. 6, SPHENOIDAL SINUS.

CT ANATOMY OF
ORBIT
CORONAL SECTIONS

1, NASOLACRIMAL DUCT. 2, GLOBE. 3, FRONTAL
SINUS. 4, FRONTAL BONE. 5, ZYGOMATIC BONE.

1, NASOLACRIMAL DUCT. 2, GLOBE. 3, FRONTAL
SINUS. 4, LAMINA OF THE ETHMOID
BONE. 5, INFRAORBITAL CANAL.

1, MAXILLARY SINUS. 2, LAMINA OF THE ETHMOID
BONE. 3, CRISTA GALLI. 4, FRONTAL BONE AND
SINUS. 5, ZYGOMATIC BONE.

1, MAXILLARY BONE AND SINUS. 2, LAMINA PAPYRACEA OF THE
ETHMOID BONE. 3, CRIBRIFORM PLATE (ETHMOID). 4, FRONTAL BONE
AND SINUS. 5, ZYGOMATIC BONE. 6, INFERIOR NASAL CONCHA.

1, MAXILLARY SINUS. 2, MAXILLARY
BONE. 3, ZYGOMATIC BONE. 4, FRONTAL
BONE. 5, LAMINA PAPYRACEA OF THE ETHMOID
BONE. 6, ZYGOMATIC ARCH.

1, ZYGOMATIC ARCH. 2, ZYGOMATIC BONE. 3, FRONTAL
BONE.4, INFERIOR ORBITAL FISSURE.

1, MAXILLARY SINUS. 2, ZYGOMATIC ARCH. 3, INFERIOR ORBITAL
FISSURE. 4, ZYGOMATIC BONE. 5, FRONTAL BONE. 6, LAMINA
PAPYRACEA OF THE ETHMOID BONE. 7, MAXILLARY BONE.

1, MAXILLARY SINUS. 2, ZYGOMATIC
ARCH. 3, ZYGOMATIC BONE. 4, FRONTAL
BONE. 5, MANDIBLE.

ANY QUESTIONS?
THANK YOU

Ct anatomy of orbit

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Ct anatomy of orbit