244 HUMAN ANATOMY. 



Structure. It is composed of a framework of fibro-connec- 

 tive tissue, consisting of a capsule and septa, and the gland sub- 

 stance, which is divided into lobes, these into lobules, and these 

 into units or follicles. 



The follicles vary in shape, present for study a cortex and 

 medulla, and consist of adenoid tissue. 



The cortical meshes of the reticulated adenoid tissue are 

 filled with lymph-corpuscles, while in the medulla the meshes are 

 less numerous and filled with large endothelioid plates and giant 

 cells. 



The capillary blood-vessels surround the follicles. 



Arteries are from superior and inferior thyroid and internal 

 mammary. 



Veins join thyroid and left innominate veins. 



Nerves are from sympathetic and pneumogastric. 



SUPRARENAL CAPSULES. The suprarenal capsules are two 

 small, triangular bodies, situated upon the upper and front part 

 of either kidney. They measure from one and one-quarter to 

 two inches in length, and less in breadth, two to three lines in 

 thickness, and weigh about two drachms. 



Structure. Like the kidneys, they consist of a cortical and 

 medullary portion, inclosed in a capsule which sends septa into 

 the substance of the body. 



The cortex is composed of three zones of epithelial cells 

 outer, middle, and inner the middle being the largest. 



The medulla consists of streaks of small, transparent cells, 

 separated by connective tissue and capillaries. These streaks 

 are continuous with the inner zone of the cortex. The nerve 

 supply is rich, consisting of non-medullated fibres connected 

 with small ganglia. 



Relations. The inferior concave border rests upon the upper sur- 

 face of the kidney. The inner border rests against the inferior vena 

 cava on the right side, the aorta on the left, and is in relation with semi- 

 lunar ganglion and great splanchnic nerves. 



The anterior surfaces touch on the right the under surface of the 

 liver and on the left side the pancreas and spleen. The posterior surface 

 lies upon the crus of the diaphragm, about opposite the ten dorsal 

 vertebrae. 



Arteries are suprarenal from the aorta, the renal, and 

 phrenic arteries. 



Veins on the right join vena cava, on left renal vein. 



Nerves, from renal and solar plexus. 



PITUITARY BODY (hypophysis cerebri) is a small, vascular 

 mass on the inferior surface of the cerebrum, but resembling in 

 structure the ductless glands. 



