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An imperforate anus is the most common congenital defect of the rectum. Shown is a diagram of the termination of the rectum in 54 cases of imperforate anus in the male.

Imperforate Anus

An imperforate anus is the most common congenital defect of the rectum. Shown is a diagram of the termination…

"Dissected fish. a, air bladder; b, urinary bladder; b, urinary bladder; br, brain; c, spinal cord; d and da, dorsal fins; dv, anal fin; e, body of the vertebra; g, gills receiving the blood from the ventral aorta leading out of the heart h; i, intestine; k, kidney; l, liver; m, spines of the vertebra; n, auricle of the heart; ov, ovary; ovd, oviduct; st, stomach; sp, spleen; u, ureter." —Davison, 1906

Dissected Fish

"Dissected fish. a, air bladder; b, urinary bladder; b, urinary bladder; br, brain; c, spinal cord;…

"Fins of Common Perch. D, first dorsal; D', second dorsal; P, pectoral; V, ventral; A, anal; C, caudal." -Whitney, 1911

Fins of Common Perch

"Fins of Common Perch. D, first dorsal; D', second dorsal; P, pectoral; V, ventral; A, anal; C, caudal."…

The interior of the anal canal and lower part of the rectum. Showing the column of Morgagni and the anal valves between their lower ends. The columns were more numerous in this specimen than usual.

Rectum and Anal Canal

The interior of the anal canal and lower part of the rectum. Showing the column of Morgagni and the…

The anal canal and rectum in a fetus. A, aged 4 to 5 months; B, 6 moths; C, 9 months. In each he anal canal is distinctly marked off from the rectum proper; the column of Morgagni and the rectal valve are distinct.

Rectum and Anal Canal in Fetus

The anal canal and rectum in a fetus. A, aged 4 to 5 months; B, 6 moths; C, 9 months. In each he anal…