Virchow received for examination a tail three inches long amputated from a boy of eight weeks. Ornstein, chief physician of the Greek army, describes a Greek of twenty-six who had a hairless, conical tail, free only at the tip, two inches long and containing three vertebrae. He also remarks that other instances have been observed in recruits. Thirk of Broussa in 1820described the tail of a Kurd of twenty-two which contained four vertebrae. Belinovski gives an account of a hip-joint amputation and extirpation of a fatty caudal extremity, the only one he had ever observed.
Before the Berlin Anthropological Society there were presented two adult male Papuans, in good health and spirits, who had been brought from New Guinea; their coccygeal bones projected 1 1/2inches. Oliver Wendell Holmes in the Atlantic Monthly, June, 1890, says that he saw in London a photograph of a boy with a considerable tail. The "Moi Boy" was a lad of twelve, who was found in Cochin China, with a tail a foot long which was simply a mass of flesh. Miller tells of a West Point student who had an elongation of the coccyx, forming a protuberance which bulged very visibly under the skin. Exercise at the riding school always gave him great distress, and the protuberance would often chafe until the skin was broken, the blood trickling into his boots.
Bartels presents a very complete article in which he describes 21persons born with tails, most of the tails being merely fleshy protuberances. Darwin speaks of a person with a fleshy tail and refers to a French article on human tails.
Science contains a description of a negro child born near Louisville, eight weeks old, with a pedunculated tail 2 1/2inches long, with a base 1 1/4 inches in circumference. The tail resembled in shape a pig's tail and had grown 1/4 inch since birth. It showed no signs of cartilage or bone, and had its origin from a point slightly to the left of the median line and about an inch above the end of the spinal column.
Dickinson recently reported the birth of a child with a tail. It was a well-developed female between 5 1/2 and six pounds in weight. The coccyx was covered with the skin on both the anterior and posterior surfaces. It thus formed a tail of the size of the nail of the little finger, with a length of nearly 3/16 inch on the inner surface and 3/8 inch on the rear surface. This little tip could be raised from the body and it slowly sank back.
In addition to the familiar caudal projection of the human fetus, Dickinson mentions a group of other vestigial remains of a former state of things. Briefly these are:--(1) The plica semilunaris as a vestige of the nictitating membrane of certain birds.
(2) The pointed ear, or the turned-down tip of the ears of many men.
(3) The atrophied muscles, such as those that move the ear, that are well developed in certain people, or that shift the scalp, resembling the action of a horse in ridding itself of flies.
(4) The supracondyloid foremen of the humerus.
(5) The vermiform appendix.
(6) The location and direction of the hair on the trunk and limbs.
(7) The dwindling wisdom-teeth.
(8) The feet of the fetus strongly deflected inward, as in the apes, and persisting in the early months of life, together with great mobility and a distinct projection of the great toe at an angle from the side of the foot.
(9) The remarkable grasping power of the hand at birth and for a few weeks thereafter, that permits young babies to suspend their whole weight on a cane for a period varying from half a minute to two minutes.
Horrocks ascribes to these anal tags a pathologic importance. He claims that they may be productive of fistula in ano, superficial ulcerations, fecal concretions, fissure in ano, and that they may hypertrophy and set up tenesmus and other troubles. The presence of human tails has given rise to discussion between friends and opponents of the Darwinian theory. By some it is considered a reversion to the lower species, while others deny this and claim it to be simply a pathologic appendix.
Anomalies of the Spinal Canal and Contents.--When there is a default in the spinal column, the vice of conformation is called spina bifida. This is of two classes: first, a simple opening in the vertebral canal, and, second, a large cleft sufficient to allow the egress of spinal membranes and substance. Figure 130represents a large congenital sacral tumor.
Achard speaks of partial duplication of the central canal of the spinal cord. De Cecco reports a singular case of duplication of the lumbar segment of the spinal cord. Wagner speaks of duplication of a portion of the spinal cord.
Foot records a case of amyelia, or absence of the spinal cord, in a fetus with hernia cerebri and complete fissure of the spinal column. Nicoll and Arnold describe an anencephalous fetus with absence of spinal marrow; and Smith also records the birth of an amyelitic fetus.
In some persons there are exaggerated curvatures of the spine.
The first of these curvatures is called kyphosis, in which the curvature is posterior; second, lordosis, in which the curvature is anterior; third, scoliosis, in which it is lateral, to the right or left.
Kyphosis is the most common of the deviations in man and is most often found in the dorsal region, although it may be in the lumbar region. Congenital kyphosis is very rare in man, is generally seen in monsters, and when it does exist is usually accompanied by lordosis or spine bifida. We sometimes observe a condition of anterior curvature of the lumbar and sacral regions, which might be taken for a congenital lordosis, but this is really a deformity produced after birth by the physiologic weight of the body. Figure 131 represents a case of lordosis caused by paralysis of the spinal muscles.
Analogous to this is what the accoucheurs call spondylolisthesis.
