Published maps of the postcentral gyrus (SI) of macaque monkeys and other primates have been incomplete in that there has been little study on the double representation of the face. The present study was undertaken to describe trigeminal representation in SI and the thalamus in 4 Old World monkeys (Macaca fascicularis). Microelectrode recording procedures were used to electrophysiologically characterize the facial areas. The somatotopic pattern of the connections of the ventroposterior nucleus with the representation of the face in SI, in particular the lower jaw, were investigated using the retrograde tracers Texas Red and Fluorescein. These tracers were injected after the facial fields within the cortex had been defined electrophysiologically. Injection in a cortical location representing the upper head area and the primary face area led to the labeling of neurons in the ventroposterior lateral nucleus (VPL) and ventroposterior medial nucleus (VPM). We conclude that there are two distinct facial areas in SI and that the upper head area is closely associated with the area subserved by the upper cervical dermatomes at the thalamic level. (Abstract shortened by UMI.)
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.33779 |
| Date | January 2001 |
| Creators | Hyams, Sarah |
| Contributors | Lund, James P. (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Faculty of Dentistry.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001862073, proquestno: MQ78896, Theses scanned by UMI/ProQuest. |
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