Publisher's Synopsis
Excerpt from Annals of Surgery, Vol. 46: A Monthly Review of Surgical Science and Practice
In practically every case studied, the lower parathyroid artery came from a prominent branch of the inferior thyroid artery. Ten entire specimens were found suitable for accurate plotting. This would ordinarily give twenty Opportunities for examining the inferior parathyroid artery, but since the gland was not found in one instance, the actual number of Observa tions was nineteen. In six instances the inferior parathyroid gland was clearly below the lower margin of the thyroid, and the parathyroid artery in these cases coursed as a distinct, usually unbranched, vessel to the hilus of the glandule. The findings Of others would indicate that so great a proportion of these cases isiprobably a unique experience. In such cases, the parathyroid artery has measured between two and three centi meters in length; in all other cases its course is seldom in excess Of four or five millimeters.
The upper parathyroid gland invariably has a short artery of supply which may arise from one of the main branches Of the inferior thyroid or from an anastomosing ramus joining the superior and inferior thyroid arteries. A very prominent anas tomosing channel was found along the posterior margin of the lateral thyroid lobe in eight of twenty instances and in these cases the superior parathyroid artery was a short branch from this channel. Most often, however, the angle at which the parathyroid vessel came Off from its parent trunk suggested strongly that its blood stream was usually from the inferior source.
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