It is not often that the persistence of fetal blood channels which are in close relation to the middle ear spaces obtrude themselves on the operator. I dealt recently with such a case, and the results obtained from an extensive investigation are of considerable interest to otologists.
The most frequent and well known of these embryonic veins that survive the changes of development is found in the petrosquamosal blood sinus. As will be seen later, this sinus and also Kelck's accessory blood sinus were present in the case to be recorded. It is not primarily with the petrosquamosal blood sinus that I am here concerned, but with other remains of this same embryonic plexus of veins, which I believe are not infrequently found in the adult skull. The literature on the petrosquamosal blood sinus is fairly extensive. One of the early descriptions of the petrosquamosal blood sinus is found
STEWART JP. THE PERSISTENCE OF FETAL BLOOD SINUSES AND THEIR RELATION TO THE MIDDLE EAR SPACES. Arch Otolaryngol. 1929;10(3):266–275. doi:10.1001/archotol.1929.00620060062006
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