The vasculature of the white bodies in the ommastrephid squid Illex illecebrosus (LeSueur, 1821): a proposed route for the dissemination of newly formed hemocytes

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Abstract
The vasculature of the white bodies within Illex illecebrosus (LeSueur, 1821) was investigated by employing arterial injections of latex and RENOgrafin-60 (a radiopaque dye) and light, electron, and scanning electron microscopy. The information obtained from these various methods indicates that the white bodies are well supplied with blood. Blood flows to a white body by way of the anterior and posterior ophthalmic arteries; passes through its tissue via small vessels, sinuli, and hemal spaces; and eventually leaves the tissue to enter the enveloping optic sinus (and hence, the venous circulation) by way of hemooscula, here described for the first time. These data have been employed to determine the route for the dissemination of the newly formed hemocytes, which evidence suggests originate in the white bodies. Furthermore, this elucidation of the vasculature provides a means of assessing both the multilobate configuration of the white bodies and the rationale for the latter''s position on the medial surface of the squid''s eye.

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