Observations on certain parts of the animal oeconomy / by John Hunter.

  • John Hunter
Date:
MDCCXCII [1792]
Catalogue details

Licence: Public Domain Mark

Credit: Observations on certain parts of the animal oeconomy / by John Hunter. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    rifes from the aorta, or emulgent, &c. the teftis receives one from the hypogaftric artery, which is fometimes as large as the other. It runs upwards from its origin, paffing clofe to the vas deferens in its way to the teftis. The fuperior fpermatic artery fometimes pafles before the lower end of the kidney; and both thefe arteries run in a ferpentine diredlion, making pretty large but gentle turnings. They are fituated behind the peritoneum ; and both run into the pofterior edge of the teftis, between the two refled;ed laminas of that membrane, much in the fame manner as the veflels pafs to the inteftines between the two refleded lamina of the mefocolon or mefentery. The veins of the teftis are analogous to its arteries; but commonly change fides with the arteries refpefting their origins from the emulgents. The fuperior fpermatic vein, to begin with its trunk, rifes commonly in the fol- lowing manner : on the right fide, from the trunk of the vena cava, a little below the emulgent, and on the left fide from the left emulgent vein. The reafon of this difference between the right and left fpermatic vein, no doubt, is becaufe the cava is not placed in the middle of the body ; fo that by the rule of ramification, which is obferved in moft parts of the body, the cava is the neareft large vein of the right fide, and the emulgent is the neareft large vein of the left fide. But the difference is inconfiderable ; and ac- cordingly we fometimes find the right fpermatic vein coming from the Tight emulgent vein ; and feveral other varieties are produced, which, fo far ^s I can obferve, follow no precife rule. There is likewife a fper- matic vein,, which rifes from the internal iliac, and runs up to the teftis with the inferior fpermatic artery. Both the fpermatic veins run behind the peritoneum with their correfponding arteries, and go into the pofte- rior edge of the teftis, where they are loft in fmall branches. The nerves of the teftis, like its blood-veffels, come from the neareft fource; that is, from the abdominal plexufes of the intercoftal; efpecially the inferior mefenteric plexus. They run to the teftis, accompanying its blood-veffels, and are difperfed with them through its fubftance. The teftis therefore, with refpedl to its nerves^ may be reckoned an abdominal vifcus 3 and this obfervation will hold good, when applied to the full- grown fubjed:, as well as to the foetus j for thofe branches of the lumbar
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