VESSELS OF THE RAT’S HYPOPHYSIS

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Abstract
The hypophyseal arteries arise from the intra-arachnoid internal carotid, and from the junction between internal carotid posterior communicating artery. The tuberal area is supplied by tuberal rami, arising from the infundibular arteries. The stalk is supplied either by peduncular rami (branches of the posterior lobe artery), or by peduncular arteries (branches of the posterior communicating artery). Along the postchiasmatic eminence, proceeding into the anterior lobe, sinuses lie along an extensive capillary bed. This capillary bed extends along the post chiasmatic eminence surrounds the stalk and anastomoses with the capillary system of the posterior lobe. The sinuses originate from one or more capillaries in the tuberal area. Quite a number of them arise from the stalk area. The anterior lobe is drained by dural veins on its caudal and rostro-lateral border. No systemic veins extend to the tuberal lobe. The posterior lobe gets its blood through the medium of a large posterior lobe artery, an asymmetrical artery arising from the posterior communicating artery. A 2d arterial supply is provided for by the caudal hypophyseal arteries, small branches of the pontine rami of the basal artery. The posterior lobe has its own dural veins running along the dorsal border on the hypophysis. The posterior lobe contributes to the anterior by two routes[long dash]via its rostral pole where sinuses "grasp into" capillaries, and through the medium of "overflows." There are short vascular channels bridging the hypophyseal cleft.