Orbital Blood Supply Flashcards
The eye has no… Vessels
Lymphatic
What is the first branch of the internal carotid artery?
The ophthalmic artery. This runs inferior laterally to the optic nerve in the optic canal
Name the 13 branches of the internal carotid artery
Within the optic canal, the Ophthalmic artery runs in the… Space
Subarachnoid space
Describe the path of the central retinal artery
Travels below the optic nerve, and Pierces the meninges 1.25 cm behind the eye
The circle of zinn is composed of which blood vessels
Plial vessels and short posterior ciliary arteries (page 80)
Which artery supplies the sclera and conjunctiva
Anterior ciliary artery
Anterior ethmoidal artery supplies the…
Skin of the nose
Posterior and anterior ethmoid artery supplies, the ethmoid air cells
The Infraorbital artery is a branch of
Maxillary artery
The supratrochlear artery supplies the
Forehead skin and scalp along with supraorbital artery
The cilioretinal artery is a branch of
The short posterior ciliary artery
Path of the MEDIAL PALPEBRAL ARTERY
- 2x arise from the anterior portion of the ophthalmic artery
- emerge below the trochlear pulley
- pierce septum above and below medial palpebral ligament
- upper and lower eyelid supply: marginal arcade & superficial arcade
Name, the three major veins of the orbit
Superior ophthalmic vein,
inferior, ophthalmic vein,
central retinal vein
The central retinal vein drains into…
The superior ophthalmic vein (most common) or directly into the cavernous sinus. Never the inferior ophthalmic vein.
The superior ophthalmic vein is formed from the union of
The supra orbital and facial veins
INFERIOR OPHTHALMIC VEIN arises from
- arises from a venous plexus on the floor of the orbit
- communicates with facial vein anteriorly and pterygoid venous plexus posteriorly
- also receives -2 vortex veins from the inferior aspect of the globe
The inferior ophthalmic vein leaves the orbit through
via the superior orbital fissure, inferiorly to the annulus
Nerves to orbital blood supply
> post-ganglionic nerves from the superior cervical sympathetic chain via the ciliary ganglion supply the central retinal artery up to the lamina cribrosa
