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LOCALISATION OF THE MOTOR AREA IN THE SHEEP
Author(s) -
Simpson Sutherland,
King J. Luella
Publication year - 1911
Publication title -
quarterly journal of experimental physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 101
eISSN - 1469-445X
pISSN - 0370-2901
DOI - 10.1113/expphysiol.1911.sp000083
Subject(s) - sulcus , coronal plane , anatomy , tongue , motor cortex , efferent , sensation , medicine , psychology , neuroscience , stimulation , afferent , pathology
1. In the sheep the cortical motor area is located in the superior frontal convolution. It extends antero‐posteriorly from a line about 2 mm. in front of the cruciate sulcus behind, almost to the frontal pole of the hemisphere, and latero‐mesially from the coronal sulcus over the dorso‐mesial border about 1 mm. on to the mesial aspect of the hemisphere. 2. It can be subdivided into four portions which are, from behind forwards, centres for movements of ( a ) hind limb, ( b ) fore limb, ( c ) head and eyes, and ( d ) face, mouth, and tongue. 3. Of these the centre for the fore limb is the most easily excitable, that for the face, mouth, and tongue the least. 4. In many individuals motor responses are not obtainable from one or more of these areas. The results of extirpation show that in the sheep these cortical centres are probably unimportant. 5. The best results were obtained under local anæsthesia with the animal in the conscious state. 6. No evidence of pain or other unpleasant sensation could be elicited from stimulation of any of the cortical surface which was exposed.