Episcleral Artery (Section Skull), Superior View

Description

Arising from the anterior segment circulation, the episcleral artery courses within the episclera superficial to the sclera, forming a perilimbal network near the corneoscleral junction. From a superior viewpoint through a skull section, the paired orbits and globes sit lateral to the midline cranial base, while the episcleral vessels trace the outer coat of each eye at the anterior pole. Superior and posterior to the globes, the optic nerves (CN II) align toward the optic canals, and adjacent orbital neurovascular bundles can be appreciated as they converge toward the superior orbital fissure and related foramina. For teaching ocular hemodynamics, the episcleral circulation matters because episcleral venous pressure directly influences intraocular pressure and becomes a practical concept when discussing secondary glaucomas and post-surgical pressure spikes. Angle procedures and filtering surgeries (trabeculectomy, glaucoma drainage devices) change outflow into the subconjunctival and episcleral pathways, so a clear spatial read on the episclera versus sclera helps learners understand why superficial vessel engorgement can parallel pressure elevation. Small vessel, big consequence. Use this plate for neuroanatomy and head and neck blocks when you want the orbit connected to the cranial base rather than isolated as an eyeball diagram, and for ophthalmology texts covering anterior segment vascular supply, episcleral injection patterns, and glaucoma pathophysiology. It also fits surgical education on orbital approaches where the relationship of orbital contents to skull base foramina and cranial nerves frames risk to vision. Anatomical accuracy verified by SciePro's Medical Advisory Board.