8i6 



A MANUAL OF ANATOMY 



At a later period the Malpighian corpuscles make their appearance. These 

 are formed from lymphoid cells, which are grouped around the small branches 

 of the splenic artery, before these branches terminate in their clusters of 

 capillaries. 



As the spleen grows towards the left side it carries with it the left layer of the 

 mesogastrium, and from this are formed the gastro-splenic omentum, the 

 lieno-renal omentum, and the lieno-phrenic, or phreno-splenic ligament. 



Zona Glomerulosa 



Structure of the Suprarenal Capsules. 



The suprarenal capsules or bodies (adrenals) belong to the so-called 

 ductless glands. Each capsule is enclosed in a thin sheath of con- 

 nective tissue, from the deep part of which processes are given off 

 into the interior, where they form a supporting stroma. The 

 propel substance of the capsule is divided into an external or 

 cortical, and internal or medullary part. 



The cortical part has a somewhat yellowish tint, and is com- 

 posed of cells supported by a fibrous stroma. The cells being 

 variously arranged in 

 different parts, the cor- 

 tex is divisible into three 

 zones, named, from 

 without inwards, zona 

 glomerulosa, zona fasci- 

 culata, and zona reticu- 

 laris. The zona 

 glomexulosa, which is 

 narrow, lies immedi- 

 ately within the ex- 

 ternal capsule, and is 

 so named because its 

 component cells are 

 grouped in such a 

 manner as to form 

 glomeruli, which are em- 

 bedded in a fibrous 

 stroma. The cells are 

 polyhedral, and each 

 contains a clear round 

 nucleus. The zona 

 fasciculata forms the 

 chief part of the cortex, 

 and is so named because 

 its component cells are 

 arranged in columns or Fig- 352.— Section of the Suprarenal Capsule. 

 fasciculi. The cells are 



similar to those of the zona glomerulosa, and the cell-columns are 

 separated from one another by fibrous trabeculae, which act as 

 carriers of the bloodvessels, nerves, and lymphatics. The zona 

 reticularis, which is narrow, lies within the zona fasciculata, and 

 is so named because its component groups of polyhedral cells are con- 

 nected with one another in such a manner as to form a reticulum. 



•Zona Fasciculata 



i S Zona Reticularis 



Medulla ~ 



