. Diseases of children. the Caucasian race,and is characterized chiefly by a Mongolian, or Chinese, cast of face,also by a microcephalic skull and retarded growth of the bones. Etiology.—This form of idiocy is congenital, and in the majorityof cases it will be found that both parents were past middle age whenthe child was born, but nothing further is known of its disease appears with equal frequency in all classes of is usually but one case in a family. Pathology.—The brain is smaller and lighter in weight than normal,the fissures are defective, and there is evidence
. Diseases of children. the Caucasian race,and is characterized chiefly by a Mongolian, or Chinese, cast of face,also by a microcephalic skull and retarded growth of the bones. Etiology.—This form of idiocy is congenital, and in the majorityof cases it will be found that both parents were past middle age whenthe child was born, but nothing further is known of its disease appears with equal frequency in all classes of is usually but one case in a family. Pathology.—The brain is smaller and lighter in weight than normal,the fissures are defective, and there is evidence of faulty developmentof the cortex. Usually there are abnormalities of the palate, ears,and fingers. Malformations of the heart, such as incomplete ventricu-lar septum and patent ductus arteriosus, are not micommon, althoughmalformations of other viscera are rare. Symptoms.—In early infancy, the facial expression and backward-ness in physical development are the only noticeable signs. The53 834 THE NERVOUS SYSTEM. Fig. 87.—Mongolian idiocy; child aged twenty months.
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