The sensory representation of the dura mater in the trigeminal ganglion of the cat.

The representation of the dura mater in the trigeminal ganglion was examined in the cat using the horseradish peroxidase (HRP) method. Following craniotomy a 50% solution of HRP was applied to various areas of the cranial dura and after a survival time of 48 h the trigeminal ganglion was processed. Cells in the first division gave rise to fibers innervating the medial aspect of the anterior fossa as well as the tentorium cerebelli. Labeled cells associated with the orbital roof were located predominantly in the dorsal and intermediate layers of the second division while the middle fossa was found to be represented mainly in the more dorsal strata of the third division. Labeled cells were smaller than the average ganglion cell.