Human physiology . ng (Fig. 4). It follows that in excising the thyroid body in man by the subcapsular method, the inferior or outer para- thyroids are easily left in situ — a fact which, as we shall see, is of great clinical and physiological importance. The inner (or superior) parathyroids are situated on the internalsurface, towards the upper pole of the thyroid lobes, with whichthey are intimately connected, since they are wrapt in a commonsheath of connective capsular tissue, and sometimes lie in thedepth of the thyroid substance. In surgical thyroidectomy thesemust obviously be excised a
Human physiology . ng (Fig. 4). It follows that in excising the thyroid body in man by the subcapsular method, the inferior or outer para- thyroids are easily left in situ — a fact which, as we shall see, is of great clinical and physiological importance. The inner (or superior) parathyroids are situated on the internalsurface, towards the upper pole of the thyroid lobes, with whichthey are intimately connected, since they are wrapt in a commonsheath of connective capsular tissue, and sometimes lie in thedepth of the thyroid substance. In surgical thyroidectomy thesemust obviously be excised along with the thyroid body. The structure of the parathyroids (both outer and inner)differs from that of the principal and accessory thyroids. Theyconsist not of hollow vesicles, but of compact masses or columnsof epithelium cells, which sometimes anastomose into branchingcords. Between the cell masses there are septa of connectivetissue, which convey the blood-vessels and nerves into the glandsubstance (Fig. 5).. 10 PHYSIOLOGY CHAP. The epithelial cells which form the specific substance of theparathyroids are columnar or polyhedral in shape; they have a
Size: 1308px × 1911px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysiology, bookyear1
