Nervous and mental diseases . C- i Fig. 271.—Leptocephalus. top of the head. The condition is also called platicephalus (). Leptocephalus.—Early synostosis of the frontal and sphenoid pro-duces leptocephalus, or narrow-headedness (Fig. 271). Macrocephalus is a large head, usually due to hydrocephalus. Microcephalus is a small head, due either to aplasia of the brain orpremature synostosis of the sutures (rarely the latter). Oxycephalus, or steeple-shaped skull, is due to synostosis of theparietal with the occipital and temporal bones, with compensatory de-velopment in the region of the
Nervous and mental diseases . C- i Fig. 271.—Leptocephalus. top of the head. The condition is also called platicephalus (). Leptocephalus.—Early synostosis of the frontal and sphenoid pro-duces leptocephalus, or narrow-headedness (Fig. 271). Macrocephalus is a large head, usually due to hydrocephalus. Microcephalus is a small head, due either to aplasia of the brain orpremature synostosis of the sutures (rarely the latter). Oxycephalus, or steeple-shaped skull, is due to synostosis of theparietal with the occipital and temporal bones, with compensatory de-velopment in the region of the bregma. Another name for this is aero-cephalus (Fig. 272). Plagiocephalus, or oblique deformity of the head, is due to uni-lateral synostosis of the frontal with one of the parietal bones (). GENERAL ETIOLOGY OF INSANITY. 707 Scaphocephaly is probably caused either by too early union ofthe sagittal suture or by the development of both parietal bones fromone center. The top of the head is keel-shaped (Fig. 274).. Fig. 272.— Oxycephalies. Fig. 273.—Plagiocephalus. Trigonocephalus.—Premature union of the frontal suture, resultingin very narrow forehead and great width behind, giving rise to the termtrigonocephalus (Fig. 275). The two systems of measurement—the craniometrical and the eeph-alometrical—differ but slightly from each other, the former, of course,being the more exact, since every portion of the naked skull is attain-able. I would recommend the following series of measurements to be
Size: 3212px × 778px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., booka, bookcentury1900, bookdecade1900, bookidnervousmentald00chu
