Fig. 226.
The male urino-genital organs.
| Ao | Aorta. |
| Cl | Cloaca. |
| Cv | Inferior vena cava. |
| FK | Fat-body. |
| N | Kidney. |
| S, S1 | Openings of ureters. |
| T | Testis. |
| Ur | Ureter. |
| Vr | Renal veins. |
| † | Appearance of ureters on the ventral surfaces of kidneys. |
Fig. 227.
Two preparations from the fat-body of Rana esculenta80.—G. H.
| I. | Section of fat-body, stained with borax-carmine (Hartnack, Oc. I, Syst. 7). | ||||
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| II. | Three lobes of fat-body of Rana esculenta; coarsely injected (Hartnack, Oc. I, Syst. 3). | ||||
| Arteries striped. Veins shaded. | |||||
b. [Minute structure. Each organ is completely surrounded by peritoneum, under which is a very fine layer of connective-tissue. The interior of the organ (Fig. 227 I) consists of large fat-cells with small patches of adenoid tissue interspersed. The organs are extremely vascular; each lobe has a main artery which gives off lateral branches: each of these immediately divides to form two vessels, which run in opposite directions and almost parallel with the main stem; the vessels then break up into a fine network of capillaries.]