Bony Orbits: Lateral wall

Bony Orbits: Lateral Wall

• The lateral wall of the bony orbit is composed of four bones:
• The greater wing of the sphenoid bone forms part of the lateral wall.
• The frontal process of the zygomatic bone contributes to the lateral wall.
• The zygomatic process of the frontal bone is another component of the lateral wall.
• The superior orbital fissure is located at the junction of the roof and lateral wall.
• The inferior orbital fissure is situated at the junction of the lateral wall and floor.

Bony Orbits: Lateral Wall

• The lateral wall of the orbital cavity consists of the greater wing of the sphenoid bone, frontal process of the zygomatic bone, and zygomatic process of the frontal bone.
• The superior orbital fissure is located where the roof and lateral wall meet.
• The inferior orbital fissure is located where the lateral wall and floor meet.

Bony Orbits: Floor

• The floor of the orbital cavity is composed of the maxillary bone and zygomatic bone.
• The maxillary process of the zygomatic bone forms the thin orbital floor.
• The zygomaticofacial foramen is located on the malar surface of the zygomatic bone.
• The maxillary sinus is also part of the floor.

Bony Orbits: Medial Wall

• The medial wall of the orbital cavity is formed by the frontal process of the maxilla, lacrimal bone, and orbital plate of the ethmoid bone.
• The lacrimal bone contains the fossa for the lacrimal sac, which connects to the nasolacrimal canal and then to the inferior nasal meatus.
• The orbital plate of the ethmoid bone contains ethmoidal air cells medial to it.
• The orbital plate of the palatine bone is also part of the medial wall.
• The body of the sphenoid bone completes the lower part of the optic canal.

Openings of the Orbit

• The optic foramen (canal) is located in the frontal bone.
• The superior orbital fissure is an opening in the lateral wall.
• The inferior orbital fissure is an opening in the floor.
• The nasolacrimal canal is an opening in the medial wall.
• The anterior and posterior ethmoidal foramina are openings in the medial wall.

Contents of Orbital Openings

• The optic foramen contains the optic nerve.
• The superior orbital fissure contains cranial nerves III, IV, V1, and VI.
• The inferior orbital fissure contains the zygomatic branch of the maxillary nerve (V2).

Bony orbits: lateral wall greater wing of sphenoid  frontal process of zygomatic bone  zygomatic process of frontal bone  superior orbital fissure (where roof and lateral wall meet)  inferior orbital fissure (where lateral wall and floor meet) ANA: Skull - 50

Bony orbits: floor thin orbital floor maxillary process of zygomatic bone zygomaticofacial foramen on malar surface maxilla maxillary sinus infraorbital nerve ( enters from pterygopalatine fossa through inferior orbital fissure to infraorbital groove then to infraorbital canal then to infraorbital foramen )      

Maxillary proc., Zygoma ANA: Skull - 51

 ANA: Skull - 52

Right orbit lateral medial Infraorbital foramen ANA: Skull - 53

Bony orbits: medial wall frontal process of maxilla frontal bone lacrimal bone fossa for lacrimal sac ( go to nasolacrimal canal then to inferior nasal meatus) orbital plate of ethmoid: (ethmoidal air cells medial to this) orbital plate of palatine bone body of sphenoid: completes the lower part of optic canal optic canal (where roof and medial wall meet) Anterior & posterior ethmoidal foramina (transmitting corresponding vessels (branch of ophthalmic artery ) to supply nasal cavity and ethmoidal air cells )

Right orbit

Frontal bone Frontal process of maxilla medial lateral ANA: Skull - 54

  Openings of the orbit

1. optic foramen (canal) 2. superior orbital fissure 3. inferior orbital fissure 4. nasolacrimal canal
2. anterior & posterior ethmoidal foramina Frontal bone Frontal process of maxilla ANA: Skull - 57

Contents of orbital openings III, IV, V , VI 1 V branch 2 ANA: Skull - 58