. American practice of surgery ; a complete system of the science and art of surgery . sterior portion becoming the filum terminale of the cord, and the anterior limb SURGICAL DISEASES OF THE PELVIC REGION. 21 of tht r being ivprcscntcd for a time by the Uvtal structuro known as the post-anal gut, which in turn disappears soon after the union of the proctodeum withthe rectum proper,—a change which completes the anal portion of the lowerbowel. Some observers believe that the fovea> and sinuses represent unobliter-ated portions of some part of the neurenteric canal; others attribute their for
. American practice of surgery ; a complete system of the science and art of surgery . sterior portion becoming the filum terminale of the cord, and the anterior limb SURGICAL DISEASES OF THE PELVIC REGION. 21 of tht r being ivprcscntcd for a time by the Uvtal structuro known as the post-anal gut, which in turn disappears soon after the union of the proctodeum withthe rectum proper,—a change which completes the anal portion of the lowerbowel. Some observers believe that the fovea> and sinuses represent unobliter-ated portions of some part of the neurenteric canal; others attribute their forma-tion to a simple infolding of the skin at the point where the filum terminale isadherent to its deep surface, and in individuals in whom the mesoblastic tissueis late in forming and scanty in amount. Still others believe that it is simply anevidence of imperfect closure of the medullary groove. In any event, the struc-ture of the sinuses and cysts, and the character of their lining membrane and ofthe contents, would seem to indicate that an epidermoid infolding is the basis of. Fig. 16—Photograph of a Sacro-Coccygeal Dunple or Fovea, Occurring, in Connection with aSpina Bifida, in a Male Child sixteen months of age. (Original.) the pathological process, rather than a development in the neurenteric canalor the deeper structures. Careful examination of sections made through thesinus wall will almost always demonstrate the presence of the pavement epithe-lium of the cuticle at some point, though it is usually impossible to find sebaceousor sweat glands. The contents of the cysts consist of a cheesy or grumousmaterial which frequently contains bundles or balls of hair more or less mixedwith the grumous mass. Under the microscope, epithelial detritus, fat droplets,and fat crystals are seen. Infection, which is prone to occur, converts the tractor cyst into a suppurating sinus or abscess. The sinuses lead down to the pos-terior surface of the lower part of the sacrum, and, if
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectsurgery, bookyear1906
