Скачать или смотреть Clinical Anatomy : Head & Neck region

Division of the external jugular vein in the supraclavicular space may consequent death, Why ?

Explanation as follows:-
Normally, when a vein is cut and it bleeds, the thin wall of the vein will collapse, like a balloon.
However the jugular vein is different.
As external jugular vein pierces the fascia, the margins of the vein get adherent to the fascia.
So if the vein gets cut, the cut ends of the vein are prevented from retraction and closure by the fascia, attached firmly to the vein.
The air is sucked into the jugular vein due to negative intrathoracic pressure with each breath.
This air will then enter the right atrium and right ventricle and stop it from working effectively. Death will result due to air embolism.
To prevent this, the deep fascia has to be cut.

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Source of images:
1. COMPLETE ANATOMY, www.3d4medical.com