Bony Orbits: Lateral wall
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Questions and Answers

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?

  • 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?

  • Squamous part
  • Frontal process (correct)
  • Nasal part
  • Zygomatic process

    • What is the gap between the lateral wall and floor of the bony orbit called?

    <p>Inferior orbital fissure</p> Signup and view all the answers

    Which bone does not contribute to the lateral wall of the bony orbit?

    <p>Occipital bone</p> Signup and view all the answers

    What is the function of the infraorbital nerve?

    <p>To supply the face</p> Signup and view all the answers

    Which bone forms the medial wall of the bony orbit?

    <p>All of the above</p> Signup and view all the answers

    What is the name of the gap between the lateral wall and floor of the bony orbit?

    <p>Inferior orbital fissure</p> Signup and view all the answers

    Which structure is located where the roof and medial wall of the bony orbit meet?

    <p>Optic canal</p> Signup and view all the answers

    What is the function of the anterior and posterior ethmoidal foramina?

    <p>To transmit vessels to the nasal cavity and ethmoidal air cells</p> Signup and view all the answers

    Which bone forms the floor of the bony orbit?

    <p>Maxilla</p> Signup and view all the answers

    What is the name of the channel that connects the lacrimal sac to the nasal cavity?

    <p>Nasolacrimal duct</p> Signup and view all the answers

    Which bone contributes to the formation of the lateral wall of the bony orbit?

    <p>All of the above</p> Signup and view all the answers

    What is the name of the foramen that transmits the infraorbital nerve?

    <p>Infraorbital foramen</p> Signup and view all the answers

    Which bone forms the roof of the bony orbit?

    <p>Frontal bone</p> Signup and view all the answers

    Which of the following structures is NOT a part of the nasolacrimal canal?

    <p>Ethmoidal foramina</p> Signup and view all the answers

    What is the function of the orbital openings?

    <p>To allow the passage of nerves and blood vessels</p> Signup and view all the answers

    Which of the following nerves passes through the orbital openings?

    <p>V2</p> Signup and view all the answers

    What is the name of the gap between the lateral wall and floor of the bony orbit?

    <p>Inferior orbital fissure</p> Signup and view all the answers

    Which of the following bones contributes to the formation of the nasolacrimal canal?

    <p>Maxilla</p> Signup and view all the answers

    Which of the following structures is NOT a foramen (canal) in the orbit?

    <p>Inferior nasal conchae</p> Signup and view all the answers

    What is the relationship between the superior and inferior orbital fissures?

    <p>They are adjacent to each other</p> Signup and view all the answers

    Which of the following is associated with the frontal bone?

    <p>Optic foramen (canal)</p> Signup and view all the answers

    What is the main function of the superior orbital fissure?

    <p>Transmission of cranial nerves</p> Signup and view all the answers

    What is the location of the inferior orbital fissure?

    <p>Between the lateral wall and floor of the orbit</p> Signup and view all the answers

    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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    Description

    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

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