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Orbital Cavity – Anatomy, Conditions and Treatment

The orbital cavity (orbit) is the bony socket in the skull that houses and protects the eyeball and surrounding structures. It plays a central role in ophthalmology.

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Things worth knowing about "Orbital Cavity"

The orbital cavity (orbit) is the bony socket in the skull that houses and protects the eyeball and surrounding structures. It plays a central role in ophthalmology.

What is the Orbital Cavity?

The orbital cavity, medically referred to as the orbit, is a cone-shaped bony socket within the human skull. It houses and protects the eyeball (bulbus oculi) along with numerous surrounding structures, including muscles, nerves, blood vessels, and fatty tissue. The orbit is formed by seven skull bones and provides the anatomical foundation for human vision.

Anatomy of the Orbital Cavity

The orbital cavity is shaped like a cone that tapers toward the back and has a volume of approximately 30 milliliters in adults. It is formed by the following bones:

Frontal bone (os frontale) – forms the roof of the orbit
Zygomatic bone (os zygomaticum) – forms the outer lower rim
Maxillary bone (os maxillare) – forms the floor
Lacrimal bone (os lacrimale) – located on the medial wall
Ethmoid bone (os ethmoidale) – forms the medial wall
Sphenoid bone (os sphenoidale) – forms the posterior portion
Palatine bone (os palatinum) – located in the posterior floor region

Contents of the Orbit

In addition to the eyeball, the orbital cavity contains the following important structures:

Extraocular muscles: Six muscles that control the movements of the eyeball
Optic nerve (nervus opticus): Transmits visual information to the brain
Blood vessels: Supply the eyeball and surrounding tissue with nutrients
Lacrimal gland (glandula lacrimalis): Produces tear fluid
Orbital fat: Cushions and protects the eyeball

Clinical Significance

The orbital cavity is of great medical importance, as it can be involved in various diseases and injuries. Conditions affecting the orbit can significantly impact visual function and external appearance.

Common Conditions of the Orbital Cavity

Orbital cellulitis: A bacterial infection of the orbital tissue, often a complication of sinusitis
Thyroid eye disease (endocrine orbitopathy): An autoimmune condition frequently associated with thyroid disorders such as Graves disease, causing protrusion of the eyes
Orbital tumors: Benign or malignant growths within the orbit that can displace the eyeball
Orbital fractures: Bone fractures of the orbit, commonly caused by blunt trauma, such as a blow-out fracture of the orbital floor
Orbital hemangiomas: Benign vascular tumors, particularly common in children

Symptoms of Orbital Conditions

Diseases of the orbital cavity can manifest through a variety of symptoms:

Exophthalmos: Protrusion of the eyeball from the orbit (also known as proptosis)
Enophthalmos: Sinking of the eyeball deeper into the orbit
Double vision (diplopia): Caused by impairment of the extraocular muscles
Vision loss: Due to pressure on the optic nerve
Swelling and redness of the eyelids and surrounding tissue
Pain behind the eye or during eye movements

Diagnosis

Various diagnostic procedures are available for examining the orbital cavity:

Clinical examination: Inspection and palpation by an ophthalmologist
Computed tomography (CT): Detailed imaging of bony structures and soft tissue changes
Magnetic resonance imaging (MRI): Particularly suitable for evaluating soft tissue changes and tumors
Ultrasound (B-scan sonography): Non-invasive visualization of structures within the orbit
Exophthalmometry: Measurement of the degree of eyeball protrusion

Treatment

Treatment of orbital conditions depends on the underlying cause:

Antibiotic therapy: For infectious causes such as orbital cellulitis
Immunosuppressive therapy: For thyroid eye disease, e.g., with corticosteroids or selenium
Surgical intervention: For fracture repair, tumor removal, or orbital decompression in severe exophthalmos
Radiation therapy: As an adjunct for certain tumors or thyroid eye disease

References

Kaufman, P. L., Alm, A. (Eds.): Adler's Physiology of the Eye. 11th Edition. Elsevier Saunders, 2011.
Yanoff, M., Duker, J. S. (Eds.): Ophthalmology. 5th Edition. Elsevier, 2019.
American Academy of Ophthalmology (AAO): Orbital Disease Guidelines. Available at: https://www.aao.org

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