The obstetrical terminology lacks in general exactness and precision. This is especially true, so far as slightly deflected head presentations are concerned. Not only in occasional papers and in general practice, but in textbooks which are considered standard books the normal head presentation is spoken of as vertex presentation, while there is no attention whatever paid to deflected presentations which lie between the normal inflected presentation and the face presentation. The normal head presentation is the occiput presentation and not the presentation of the vertex, which is the top of the head. In occiput presentations the posterior fontanelle is the lowest point of the skull. If we have to deal with a vertex presentation there is a slight abnormality, a slight deflection which brings anterior and posterior fontanelle into the same level.
SOME ETIOLOGIC FACTORS.
Without entering into a discussion of the various theories concerning the causes of this slight
KOLISCHER G. DEFLECTED PRESENTATION IN LABOR. JAMA. 1902;XXXIX(7):351–355. doi:10.1001/jama.1902.52480330005001a
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