Labelled trigeminal ganglion cells after injection of horseradish peroxidase in the extraocular muscles and IIIrd nerve of the lamb.

After injection of HRP in the oculomotor nerve labelled cells were found in the dorsal most part of the ophthalmo-maxillary area of the semilunar ganglion. Below this area a labelled cellular pool was detected following the injection of the enzyme in the extrinsic eye muscles. A clear somatotopic arrangement of these muscles was noticeable.