(A) Angiogram of a segment of the left thoracic arterial rete of a harbor porpoise in supine position, filled with contrast medium from an intercostal.

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(A) Angiogram of a segment of the left thoracic arterial rete of a harbor porpoise in supine position, filled with contrast medium from an intercostal artery, showing the left rete (lr), with some spill-over to the right rete (rr) by way of the intra-vertebral rete, the intercostal artery (ica), the meningeal arteries (maa) and the catheter (c). (A) Angiogram of a segment of the left thoracic arterial rete of a harbor porpoise in supine position, filled with contrast medium from an intercostal artery, showing the left rete (lr), with some spill-over to the right rete (rr) by way of the intra-vertebral rete, the intercostal artery (ica), the meningeal arteries (maa) and the catheter (c). (B) Light microscopical representation of a cross-section through a part of the thoracic arterial rete showing numerous arteries (a) and thin-walled sinusoids (s) embedded in fat (f). (C) Scanning electron microscopy representation of the thoracic rete, after freeze-cracking of the sample in liquid nitrogen, showing arteries (a) and sinusoids (s) embedded in fat (f). (D) Detail of sinusoid (s) embedded in (empty) fat cells (f). Arnoldus Schytte Blix et al. J Exp Biol 2013;216:3385-3387 © 2013. Published by The Company of Biologists Ltd