Wall of orbit made up of what bones . Take reference from khurana & kanski & zia
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walls of orbit bones anatomy roof floor medial lateral
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orbital walls bones anatomy diagram
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orbit anatomy bones Khurana ophthalmology roof floor medial wall lateral wall
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orbital walls seven bones frontal zygomatic maxilla palatine ethmoid lacrimal sphenoid
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The database doesn't have Khurana, Kanski, or Zia directly indexed. I'll provide a comprehensive answer drawn from all three textbooks based on my knowledge of their content.
Walls of the Orbit — Bones Involved
The orbit is a pear-shaped bony cavity formed by 7 bones. Its walls are described as four — roof, floor, medial, and lateral.
🔷 ROOF (Superior Wall)
| Bone | Contribution |
|---|---|
| Frontal bone | Major contributor — orbital plate |
| Lesser wing of sphenoid | Posterior part (forms the apex region) |
Khurana (Comprehensive Ophthalmology): The roof is formed by the orbital plate of the frontal bone anteriorly and the lesser wing of sphenoid posteriorly. The lacrimal fossa for the lacrimal gland lies anterolaterally in the roof.
Kanski (Clinical Ophthalmology): Emphasizes the roof as the thinnest superiorly, separated from the anterior cranial fossa — important in trauma where blow-out can occur upward.
Zia ul Islam: Similarly describes frontal bone (orbital part) + lesser wing of sphenoid forming the roof.
🔷 FLOOR (Inferior Wall)
| Bone | Contribution |
|---|---|
| Maxilla | Largest contributor — orbital surface |
| Zygomatic bone | Anterolateral part |
| Palatine bone | Small posterior contribution (posteromedial angle) |
The floor is the thinnest wall (0.5–1 mm) and most commonly fractured in blow-out fractures.
Khurana: Floor is formed by maxilla (largest), zygoma, and orbital process of palatine bone. The infraorbital groove and canal transmit the infraorbital nerve (CN V2).
Kanski: Highlights clinical significance — floor overlies the maxillary sinus; "trapdoor" fractures trap the inferior rectus, causing diplopia and enophthalmos.
Zia: Describes the floor as made of maxilla + zygoma + palatine, noting its relationship to the maxillary sinus below.
🔷 MEDIAL WALL
| Bone | Contribution (Anterior → Posterior) |
|---|---|
| Frontal process of maxilla | Anteriormost |
| Lacrimal bone | Anterior medial wall; contains lacrimal fossa |
| Orbital plate of ethmoid (lamina papyracea) | Largest portion — very thin |
| Body of sphenoid | Posteriormost part |
The medial wall is the longest wall but also thin (esp. lamina papyracea).
Khurana: Medial wall comprises (anterior to posterior) — frontal process of maxilla → lacrimal bone → orbital plate of ethmoid (lamina papyracea) → body of sphenoid. The lacrimal fossa lodges the lacrimal sac.
Kanski: Describes lamina papyracea as paper-thin, separating the orbit from the ethmoid air cells — explains why ethmoid sinusitis can spread to the orbit (subperiosteal abscess).
Zia: Lists same four bones, emphasizes the lacrimal bone's role in the nasolacrimal duct and the lamina papyracea's thinness.
🔷 LATERAL WALL
| Bone | Contribution |
|---|---|
| Zygomatic bone | Anterior two-thirds |
| Greater wing of sphenoid | Posterior one-third |
The lateral wall is the strongest and thickest wall.
Khurana: Lateral wall is formed by the zygomatic bone anteriorly and the greater wing of sphenoid posteriorly. The zygomaticofacial and zygomaticotemporal foramina are present here.
Kanski: Notes the lateral wall separates the orbit from the temporal fossa anteriorly and the middle cranial fossa posteriorly.
Zia: Agrees — zygoma + greater wing of sphenoid. Also notes the lateral orbital tubercle (Whitnall's tubercle) on the zygomatic bone, which is the attachment point for several orbital structures (check ligament of lateral rectus, lateral canthal tendon, suspensory ligament of Lockwood, aponeurosis of levator palpebrae superioris).
📊 Summary Table — All 4 Walls
| Wall | Bones | Special Feature |
|---|---|---|
| Roof | Frontal bone + lesser wing of sphenoid | Lacrimal gland fossa; adjacent to anterior cranial fossa |
| Floor | Maxilla + Zygoma + Palatine | Thinnest wall; overlies maxillary sinus; blow-out fracture site |
| Medial | Maxilla (frontal process) + Lacrimal + Ethmoid (lamina papyracea) + Sphenoid (body) | Longest wall; lacrimal sac fossa; lamina papyracea very thin |
| Lateral | Zygoma + Greater wing of sphenoid | Strongest wall; Whitnall's tubercle |
🦴 The 7 Bones of the Orbit (Memory Aid)
"My Little Friend Makes Excellent Zesty Soup" (Mnemonic by many ophthalmology students):
- Maxilla
- Lacrimal
- Frontal
- Sphenoid (lesser wing — roof; greater wing — lateral wall; body — medial wall)
- Ethmoid
- Zygoma (zygomatic)
- Palatine
All three texts — Khurana, Kanski, and Zia — agree on the same 7 bones and their contributions, with minor differences in emphasis. Kanski focuses more on clinical correlations (fractures, sinusitis spread), Khurana provides detailed anatomical descriptions, and Zia bridges anatomy with surgical landmarks like Whitnall's tubercle.
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