The somatotopic organization of the cat trigeminal ganglion as determined by the horseradish peroxidase technique

The Anatomical Record
C F Marfurt

Abstract

The somatotopic organization of the cat trigeminal ganglion has been investigated in the present study by using the horseradish peroxidase (HRP) technique. In separate animals, the corneal, supraorbital, infraorbital, inferior alveolar, or mental branches of the trigeminal nerve have been transected and then soaked in concentrated solutions of HRP. Retrogradely labeled corneal and supraorbital neurons have been found, with extensive overlap between the two cell populations, in the anteromedial region of the trigeminal ganglion. Inferior alveolar and mental neurons have been found to possess similar distributions within the posterolateral part of the trigeminal ganglion. Infraorbital cells have been localized in a central position. The cell bodies of any given nerve are found in at least minimal numbers in all dorsoventral levels of the trigeminal ganglion. However, cell bodies of origin of the supraorbital nerve and the lateral branch of the infraorbital nerve, innervating more posterior or lateral areas of the head and face, are found in greater numbers dorsally. Conversely, cell bodies of origin of the medial branch of the infraorbital nerve, the inferior alveolar nerve, and the mental nerve, supplying more rostral or intraor...Continue Reading

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