Excerpt from Surgery of the Head
The subcutaneous tissue of the scalp is firm and fibrous, and in its meshwork ramify the various arteries of the scalp. It is on account of this relationship between the arteries and their supporting framework that h?morrhage is so severe in scalp injuries, and their ligature in operations so tedious and unsatisfactory. The vessels are unable to contract and retract - as in other situations.
From the middle line in front, progressing backwards, the arteries of the scalp are as follows: frontal and supra-orbital (above the orbit), lachrymal (at the outer angle of the orbit), temporal (in front of the car), posterior auricular (behind the ear), and occipital (half-way between the ear and the occipital protuberance). All these vessels anastomose freely, one with the other and with those of the opposite side of the head. The methods adopted for the control of bleeding during operation arc enumerated in Chapter VIII.
The areas supplied by the sensory nerves of the scalp are depicted in the accompanying figure.
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