Which tissue is NOT found in the Pre-laminar portion of the optic nerve?

• A. Intermediary tissue of Kuhnt
• B. Border tissue of Jacoby
• C. Intermediary tissue of Javal
• D. Border tissue of Elschnig

Answer: (C)

In the pre-laminar portion of the optic nerve, you’re looking at the segment just in front of the lamina cribrosa, where the nerve is surrounded by glial and border-tissue structures that connect with the scleral canal. Two of the key tissues here are border tissues that form the boundary at the edge of the lamina cribrosa—the border tissue of Jacoby and the border tissue of Elschnig. Those border tissues help delineate the nerve from the surrounding sclera.

Intermediary tissue of Kuhnt is a delicate glial-related tissue seen in this region as part of the supporting matrix around the nerve fibers heading toward the lamina. However, the intermediary tissue of Javal is not a component of the pre-laminar optic nerve; it is associated with retinal/optic-disc areas more closely tied to the retina itself rather than the anterior portion of the optic nerve proper. Therefore, the tissue that is not found in the pre-laminar portion is the intermediary tissue of Javal.