from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Either of a pair of folds of peritoneum that attach to the caudal end of the gonads (testes in males and ovaries in females).
from The Century Dictionary and Cyclopedia
- n. The posterior trailing flagellum of a biflagellate infusorian, used for steering: correlated with tractellum.
- n. In odontography, an embryonic epithelial structure which becomes the enamel-organ of the tooth.
- n. In anatomy, a fibrous cord passing downward from the testis in the fetus to the skin of the scrotum, and drawing down the testis as the fetus grows.
Although at one time the whole of the growing tooth is contained in the cavity of the alveolus, the latter never completely encloses it, since there is always an aperture over the top of the crown filled by soft tissue, by which the dental sac is connected with the surface of the gum, and which in the permanent teeth is called the gubernaculum dentis.
To put it somewhat differently, Bracton made a basic distinction between government (gubernaculum) and law (jurisdictio), and held that the king's absolute au - thority extended only to the former.
Dr. Sharpey (Quain's Anatomy, 5th edition) observes, that "the office of the gubernaculum is yet imperfectly understood."
From my own observations, I am led to believe that no such muscular structure as a gubernaculum exists, and therefore that the descent of the testis is the effect of another cause.
As the scrotum develops, the main portion of the lower end of the gubernaculum is carried, with the skin to which it is attached, to the bottom of this pouch; other bands are carried to the medial side of the thigh and to the perineum.
In the inguinal crest a peculiar structure, the gubernaculum testis, makes its appearance.
The one above the testis is the plica vascularis, and contains ultimately the internal spermatic vessels; the one below, the plica gubernatrix, contains the lower part of the gubernaculum, which has now grown into a thick cord; it ends below at the abdominal inguinal ring in a tube of peritoneum, the saccus vaginalis, which protrudes itself down the inguinal canal.
In rare cases the gubernaculum may fail to contract adhesions to the uterus, and then the ovary descends through the inguinal canal into the labium majus, and under these circumstances its position resembles that of the testis.
The gubernaculum in the female lies in contact with the fundus of the uterus and contracts adhesions to this organ, and thus the ovary is prevented from descending below this level.
By the fifth month the lower part of the gubernaculum has become a thick cord, while the upper part has disappeared.
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