Extraconal space

The extraconal space (Extraconal orbital compartment ; Peripheral orbital space) is located between the periorbita and the muscle cone formed by the extraocular muscles with their fascia.

Boundaries:

• Peripherally: periorbita

• Internally: four recti muscles with intermuscular septa

• Anteriorly: orbital septum

• Posteriorly: orbital apex

Contents:

• Peripheral orbital fat

• Muscles:

  • Superior oblique muscle

  • Inferior oblique muscle

  • Levator palpebrae superioris

  • Lacrimal gland and lacrimal sac

• Arteries:

  • Lacrimal artery

  • Supraorbital artery

  • Posterior ethmoidal artery

  • Anterior ethmoidal artery

  • Internal palpebral artery

  • Supratrochlear artery

  • Dorsal nasal artery

  • Infraorbital artery

• Veins:

  • Superior and inferior ophthalmic veins

  • Infraorbital vein

• Nerves: lacrimal, fronal, trochlear, anterior and posterior ethmoidal nerves

Pathology:

• Malignant lymphoma

• Capillary hemangioma of childhood

• Intrinsic neoplasm of lacrimal gland

• Pseudotumour

• Intraorbital and extra orbital lesions extending into extraconal space