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Tunica adventitia: The main constituent of the adventitia is collagen fibres, secreted by fibroblasts. Elastic fibres are also present, a concentration of such fibres at the inner boundary of the adventitia is called the external elastic membrane. The external elastic membrane is not as prominent as the internal, and as arteries get smaller (see small arteries, below) disappears much earlier. The tunica adventita is relatively larger than in elastic arteries, it can be up to the same size as the media. It will often blend in with the CT of surrounding structures. Adipose cells may be present.
The Pecten of Gallus domesticus.
that the blood-vessels have no adventitia, though he describes .... not persist very long and does not form a vascular capsule. to the lens, is, I think, ...
jcs.biologists.org/cgi/reprint/s2-68/271/413.pdf - Similar pages

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Arteries are said to have three concentric layers of tissue or tunics that make up the wall structure. These are best seen in the muscular arteries. The innermost layer, the tunica intima, is composed of squamous endothelial cells resting on a basal lamina and supported by a delicate fibroelastic layer. In muscular arteries, the tunica intima contains an internal elastic lamina. The middle layer is the tunica media. This contains helically or circularly oriented smooth muscle interspersed with elastic lamellae in varying proportions depending on the function of the vessel. In general, the amount of elastic tissue decreases in the tunica media as the vessels become smaller and smooth muscle becomes the dominant component. The outermost layer, the tunica adventitia, consists of longitudinally oriented connective tissue. In larger muscular arteries there is an external elastic lamina separating the tunica media from the tunica adventitia.
Figure 24 shows a small artery and vein found at the periphery of a ganglion (slide 80). These vessels are larger than those in the previous figure but I call them small as the artery has fewer than 8 layers of smooth muscle. Part of another small vein is seen at the bottom left. Red blood cells can be seen in the lumina of all three vessels.

The media of the small artery is much larger than that of the small veins. A few bulgy endothelial cells can be seen in the artery, but otherwise an intima is not distinguishable. Elastic tissue is also not identifiable. A few flattened endothelial cells appear to be present in the vein. The adventitia of the vessels blends in with the surrounding CT. An adventitia is most distinct along the top left of the vein, where it borders on adipose cells.

Formaría unión = would blend in/merge with??

Blackwell Synergy - Exp Physiol, Volume 90 Issue 4 Page 469-475 ...
Knowledge of vascular structure is largely based on a long-standing, .... The adventitial cells do not appear to be part of the structure that holds the ...
www.blackwell-synergy.com/doi/abs/10.1113/expphysiol.2005.0... - Similar pages

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The ureters are covered with an adventitia which is continuous with the surrounding fibroelastic connective tissue containing abundant adipose cells, numerous blood vessels and small nerves. A portion of the tube may be covered with a serosa.


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Note added at 2 hrs (2008-01-24 22:20:38 GMT)
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oops

....blood vessels

How dreadfully complicated. I don't just mean the translation into English, but the actual MEANING of the Spanish and what is going on with the adventitia!

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Note added at 2 hrs (2008-01-24 22:27:03 GMT)
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After all that, perhaps it means

"would connect with/connects with the vascular structure"..

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Tunica adventitia: entirely made of connective tissue. It also contains nerves that supply the muscular layer, as well as nutrient capillaries (vasa vasorum) in the larger blood vessels.


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Note added at 2 hrs (2008-01-24 22:27:29 GMT)
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SORRY

would NOT connect with/does not connect with...



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Note added at 19 hrs (2008-01-25 15:42:58 GMT) Post-grading
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So that's the reason!

I didn't know it was a back-translation ;) Good luck with it!