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Partial deficiency is described by Petit Severinus, and others. There may be imperforation or congenital occlusion of some portion of the urethra, causing enormous accumulation of urine in the bladder, but fortunately there is generally in such cases some anomalous opening of the urethra giving vent to the excretions. Tulpius mentions a case of deficient urethra.
The median congenital fissures of the neck are probably caused by defective union of the branchial arches, although Arndt thinks that he sees in these median fistulas a persistence of the hypobranchial furrow which exists normally in the amphioxus. They are less frequent than the preceding variety. The most typical form of malformation of the esophagus is imperforation or obliteration.
In some instances the rectum is entirely absent, the colon being the termination of the intestinal tract. There are cases on record in which the rectum communicated with the anus solely by a fibromuscular cord. Anorectal atresia is the ordinary imperforation of the anus, in which the rectum terminates in the middle of the sacral cavity.
Guys, the celebrated Marseilles litterateur of the eighteenth century, was born with only one ear. Chantreuil mentions obliteration of the external auditory canal in the new-born. Bannofont reports a case of congenital imperforation of the left auditory canal existing near the tympanic membrane with total deafness in that ear.
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