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Human anatomy, including structure and development and practical considerations . lesions of the motor zonemay therefore produce a paralysis limited to one part controlled by the affected por-tion of the cortex, as of the face, arm or leg (monoplegia). The lesion is muchmore likely to involve two adjacent areas, as of the face and arm, or of the armand leg, giving rise to a combined paralysis ; but no single lesion, unless it werecrescentic in form, could involve at the same time the leg and face areas withoutincluding the intervening arm area. Within each of the larger areas a more specialize

Human anatomy, including structure and development and practical considerations . lesions of the motor zonemay therefore produce a paralysis limited to one part controlled by the affected por-tion of the cortex, as of the face, arm or leg (monoplegia). The lesion is muchmore likely to involve two adjacent areas, as of the face and arm, or of the armand leg, giving rise to a combined paralysis ; but no single lesion, unless it werecrescentic in form, could involve at the same time the leg and face areas withoutincluding the intervening arm area. Within each of the larger areas a more specialize Stock Photo
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Contributor:

The Reading Room / Alamy Stock Photo

Image ID:

2AWD1GB

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7.1 MB (234.5 KB Compressed download)

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1957 x 1277 px | 33.1 x 21.6 cm | 13 x 8.5 inches | 150dpi

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Human anatomy, including structure and development and practical considerations . lesions of the motor zonemay therefore produce a paralysis limited to one part controlled by the affected por-tion of the cortex, as of the face, arm or leg (monoplegia). The lesion is muchmore likely to involve two adjacent areas, as of the face and arm, or of the armand leg, giving rise to a combined paralysis ; but no single lesion, unless it werecrescentic in form, could involve at the same time the leg and face areas withoutincluding the intervening arm area. Within each of the larger areas a more specialized differentiation is possible, although none of them can be sharply defined, not even the larger. That the facialcentre lies in the lower part of the anterior central convolution is certain, and it isbelieved that the upper and lower muscles of the face are each represented by a sepa-rate centre. In the upper and forward part of the face-area are represented themovements of the cheek and eye-lids ; in the posterior part the movements of thepharynx, platysma and jaws. Fk;. 1042.. Diagram illustrating probable relations of physiologicai areas and centres of lateral aspect of left cerebral hemisphere. (Mills.) In the arm-area it is considered as certain that the centre for the movements ofthe thumb and index finger is below; above is that for the finger and hands; andin the highest part is that for the shoulder. In the posterior parts of the secondfrontal convolution and in a portion of the third frontal convolution are the centresfor the associated lateral movements of the eyes and lateral movement of the head(Beevor and Horsley). Our knowledge of the more special localization within the leg centre is not at alle.xact, and the many views held are very contradictory. It is believed that thecentres for the movements of the thigh, knee, foot, and toes, are arranged in theorder named, from before backward on the lateral border of the hemisphere and inthe paracentral lobe. A narrow zon

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