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Multiunit electrophysiological recording techniques were used to explore the somatosensory cortex of the California ground squirrel (Spermophilus beecheyii). Cortex rostral and caudal to the primary somatosensory area (SI) contained neurons that responded to stimulation of deep receptors and to muscle and joint manipulation. The region of cortex rostral to SI was termed the rostral field (R) because of possible homologies with a similar field described in other mammals. Cortex caudal to SI had neurons that responded to stimulation of deep receptors and has been termed the parietal medial area (PM), as in previous investigations in squirrels. Like SI, both R and PM contained a complete or almost complete representation of the body surface, although the receptive field size for clusters of neurons in these regions was somewhat larger than those for clusters of neurons in SI. Electrophysiological recording results were correlated with histologically processed tissue that had been sectioned tangentially. Although SI was clearly identified as a myelin-dense region, both R and PM stained much less densely for myelin. Our results indicate that as in a number of other mammals including monotremes, marsupials, carnivores, and primates, the anterior parietal cortex of the California ground squirrel contains multiple representations of the sensory epithelium. This work, as well as a growing body of studies of somatosensory cortex organization in a variety of mammals, indicates that anterior parietal fields other than SI existed early in mammalian evolution, and were present in the common ancestor of all mammals.

Multiple somatosensory areas in the anterior parietal cortex of the California ground squirrel (Spermophilus beecheyii).