A text-book of physiology for medical students and physicians . haveobserved that the most positive and invariable symptom of lesionsin this region is a condition of astereognosis, that is, a diminutionin what may be called the stereognostic perceptions. By stereog-nostic perception is meant the power to judge concerning the formand consistency of external objects when handled, and it must beregarded as a perception based upon localized sensations of touch, * Consult Monakow, Ergebnisse der 1902, vol. i, part i,p. 621. f Cushing, loc. cit. 202 PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. to
A text-book of physiology for medical students and physicians . haveobserved that the most positive and invariable symptom of lesionsin this region is a condition of astereognosis, that is, a diminutionin what may be called the stereognostic perceptions. By stereog-nostic perception is meant the power to judge concerning the formand consistency of external objects when handled, and it must beregarded as a perception based upon localized sensations of touch, * Consult Monakow, Ergebnisse der 1902, vol. i, part i,p. 621. f Cushing, loc. cit. 202 PHYSIOLOGY OF CENTRAL NERVOUS SYSTEM. together perhaps with those of temperature and muscular sen-sibility. On the whole, therefore, we must infer that the cortexin this postcentral area is concerned with the finer and more con-scious interpretations of the sensations of pressure, temperature,and muscular conditions, and especially the higher type of thesesensations, which we can project or localize accurately. In thisgeneral region there lie, in the first place, the centers in which Cen/ra/ ^u/cus. Medial lemniscus(?) Fig. 90.—Schema representing the origin and course of the fibers of the median fillet,—theintercentral paths of the fibers of body sense. terminate the projection fibers contained in the lemniscus, and inwhich, therefore, the primary sensations of pressure and tempera-ture are mediated, so that lesions here may be associated with a lossor impairment of these sensations in the skin of the opposite sideof the body, a condition spoken of in general as , in this region there are mediated also probably some ofthe syntheses and associations of these sensations, which wedesignate as perceptions or judgments, and it is possible that in- SENSE AREAS AND ASSOCIATION AREAS. 203 juries or defects here may be followed by an impairment of thesehigher perceptive reactions, without any definite loss of sensibilityin the skin. Such a defect falls under the general head of agnosia, andis illus
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