Anatomy (PNS) · MU Sofia

219. Blood supply of the eye.

Covers the arterial supply of the orbit and eyeball, beginning with the ophthalmic artery as a branch of the internal carotid and its nine named branches in the order they arise, including the central retinal artery and posterior ciliary arteries. It also gives a mnemonic (MCLESSI) for the branches, a short table for the central retinal artery's course, and the venous drainage through the superior and inferior ophthalmic veins with their routes out of the orbit.

Inside: 3 sections · 2 labelled pictures · 1 table · 10 flashcards · 3 min

Topic 38 of 44 in the MU Sofia syllabus for Anatomy (PNS) (Medicine, Year 2). The free AceMed note covers it in 3 sections, about 416 words (3 min of reading), with 10 flashcards.

In this note

  1. BLOOD SUPPLY of the eye:
  2. Vessels :
  3. Veins :

Vessels :

  • The atrial supply to the structures of the orbit including the eyeball is by the opthalmic artery
  • The opthalmic art:
  • ↳ Is a branch of the internal carotid artery.
  • ↳ Enters the orbit through the optic canal with the optic nerve.
  • ↳ In the orbit, it gives offs several branches :
  1. 1. Lacrimal artery : on the lateral side, suppling the lacrimal gland, muscle & the lateral side of the eyelid.
  2. 2. Central Retinal Art :
  • travels within the optic nerve sheath alongside the optic n
  • Penetrates the eye through the optic disc
  • Supplies the layers of the retina
  1. 3. Posterior ciliary arteries (long & short)
  • Enters the eyeball posteriorly, piercing the sclera, & supplying structures inside the eyeball.
  1. 4. Muscular arteries : supplying the intrinsic muscles of the eyeball
  2. 5. Supra-orbital art : exits the orbit through the supra-orbital foramen with the supra-orbital n. . Supplies the forehead & scalp.
  3. 6. Posterior Ethmoidal art : exits the orbit through the posterior ethmoidal foramen to supply the ethmoidal cells & nasal cavity
  4. 7. Anterior Ethmoidal art : " " " through the ant. ethmoidal foramen, enters the cranial cavity giving off the anterior meningeal branch, and continues into the nasal cavity supplying the septum & lateral wall
  5. 8. Dorsal Nasal art : leaves the orbit to supply the upper surface of the nose.
  6. 9. Supratrochlear art : leaves the orbit with the supratrochlear n. suppling the forehead.

Terminal branches

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