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Questions and Answers
Which bone forms the lateral wall of the bony orbit?
Which bone forms the lateral wall of the bony orbit?
- Frontal bone
- Maxilla bone
- Sphenoid bone
- Zygomatic bone (correct)
Which structure is located where the roof and lateral wall of the bony orbit meet?
Which structure is located where the roof and lateral wall of the bony orbit meet?
- Optic foramen
- Inferior orbital fissure
- Lacrimal gland
- Superior orbital fissure (correct)
Which part of the frontal bone contributes to the lateral wall of the bony orbit?
Which part of the frontal bone contributes to the lateral wall of the bony orbit?
- Squamous part
- Frontal process (correct)
- Nasal part
- Zygomatic process
What is the gap between the lateral wall and floor of the bony orbit called?
What is the gap between the lateral wall and floor of the bony orbit called?
Which bone does not contribute to the lateral wall of the bony orbit?
Which bone does not contribute to the lateral wall of the bony orbit?
What is the function of the infraorbital nerve?
What is the function of the infraorbital nerve?
Which bone forms the medial wall of the bony orbit?
Which bone forms the medial wall of the bony orbit?
What is the name of the gap between the lateral wall and floor of the bony orbit?
What is the name of the gap between the lateral wall and floor of the bony orbit?
Which structure is located where the roof and medial wall of the bony orbit meet?
Which structure is located where the roof and medial wall of the bony orbit meet?
What is the function of the anterior and posterior ethmoidal foramina?
What is the function of the anterior and posterior ethmoidal foramina?
Which bone forms the floor of the bony orbit?
Which bone forms the floor of the bony orbit?
What is the name of the channel that connects the lacrimal sac to the nasal cavity?
What is the name of the channel that connects the lacrimal sac to the nasal cavity?
Which bone contributes to the formation of the lateral wall of the bony orbit?
Which bone contributes to the formation of the lateral wall of the bony orbit?
What is the name of the foramen that transmits the infraorbital nerve?
What is the name of the foramen that transmits the infraorbital nerve?
Which bone forms the roof of the bony orbit?
Which bone forms the roof of the bony orbit?
Which of the following structures is NOT a part of the nasolacrimal canal?
Which of the following structures is NOT a part of the nasolacrimal canal?
What is the function of the orbital openings?
What is the function of the orbital openings?
Which of the following nerves passes through the orbital openings?
Which of the following nerves passes through the orbital openings?
What is the name of the gap between the lateral wall and floor of the bony orbit?
What is the name of the gap between the lateral wall and floor of the bony orbit?
Which of the following bones contributes to the formation of the nasolacrimal canal?
Which of the following bones contributes to the formation of the nasolacrimal canal?
Which of the following structures is NOT a foramen (canal) in the orbit?
Which of the following structures is NOT a foramen (canal) in the orbit?
What is the relationship between the superior and inferior orbital fissures?
What is the relationship between the superior and inferior orbital fissures?
Which of the following is associated with the frontal bone?
Which of the following is associated with the frontal bone?
What is the main function of the superior orbital fissure?
What is the main function of the superior orbital fissure?
What is the location of the inferior orbital fissure?
What is the location of the inferior orbital fissure?
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Study Notes
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).
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