Short Ciliary Nerve Within a Sectional View of the Male Skull, Lateral View

Description

Arising from the ciliary ganglion in the posterior orbit, the short ciliary nerves course anteriorly as multiple fine filaments that radiate toward the sclera around the optic nerve (CN II) before piercing the globe near its posterior pole. A lateral sectional view of the male skull situates this neurovascular bundle within the bony orbit, with the frontal bone forming the superior wall and the maxilla contributing inferiorly, while the orbital apex and optic canal lie posterior and medial to the globe. Portions of the extraocular musculature and fascial sleeves surround the posterior globe, and small orbital vessels run in parallel with the nerves as they pass forward. Orientation is clear. The nerves remain posterior to the cornea and anterior to the orbital apex. Short ciliary nerves carry postganglionic parasympathetic fibers from CN III (via the ciliary ganglion) to the sphincter pupillae and ciliary muscle, along with sympathetic fibers and sensory afferents from the nasociliary nerve (V1), so their relationship to the optic nerve and posterior sclera matters in both teaching and practice. This is the anatomy behind anisocoria and loss of accommodation after a ciliary ganglion lesion, and it explains why posterior orbital surgery, trauma, or compressive processes near the orbital apex can produce mixed autonomic and sensory findings rather than an isolated motor deficit. It also frames the pathway affected in Adie tonic pupil and in iatrogenic pupillary abnormalities after retrobulbar or peribulbar anesthesia. Use this illustration for neuroanatomy and head and neck courses when tracing parasympathetic pathways to the eye, and for ophthalmology or oculoplastics texts describing orbital apex exposure, optic nerve sheath procedures, or complications of orbital decompression. It also supports clinical graphics for radiology and neurology publications that correlate orbital cross sections with pupillary and accommodative deficits. Anatomical accuracy verified by SciePro's Medical Advisory Board.