A manual of operative surgery . seeks iSIf/ with the finger for the tip of the great cornu of the hyoid bone, and when this is discovered all the fig. 329—ligature of right exter- NAL CAROTID ARTERY. points leading to the artery A> platysma. B_ Cervical fascia. c< Ster_ are in evidence (Fig. 32Q). no-masdd; n Digastric; E, Great s ° ^ J cornu of hyoid bone; a, External The artery Should nOW be ex- carotid at origin of superior thyroid ; . , , - , h, Crossing lingual artery points to pOSed Opposite tO the level Of the lingual vein ; V, Facial artery; d, tip of the great cornu, and between
A manual of operative surgery . seeks iSIf/ with the finger for the tip of the great cornu of the hyoid bone, and when this is discovered all the fig. 329—ligature of right exter- NAL CAROTID ARTERY. points leading to the artery A> platysma. B_ Cervical fascia. c< Ster_ are in evidence (Fig. 32Q). no-masdd; n Digastric; E, Great s ° ^ J cornu of hyoid bone; a, External The artery Should nOW be ex- carotid at origin of superior thyroid ; . , , - , h, Crossing lingual artery points to pOSed Opposite tO the level Of the lingual vein ; V, Facial artery; d, tip of the great cornu, and between X^s^. thyr°id ^;the origins of the superior thyroid and lingual arteries. In this part of the operation care mustbe taken to avoid the facial and superior thyroid glands may lie in front of the vessel. The arteryhaving been cleared, the needle is passed from without effecting this, great care must be taken to avoid the superiorlaryngeal nerve, which courses behind the artery in this Collateral Circulation after Ligature of the ExternalCarotid—(See the collateral circulation after ligature of thecommon carotid, page 382.) 386 OPERATIONS ON ARTERIES [part v Varieties of the External Carotid. i. See the varieties of the common carotid. 2. The branches of the artery may be crowded together near the commencement of the trunk. 3. The number of branches may be diminished, two or three arising from one trunk. 4. The number of branches may be increased, sub- sidiary vessels arising from the main artery. THE LINGUAL ARTERY Anatomy.—This artery arises nearly opposite to the greatercornu of the hyoid bone, and about three-quarters of an inchabove the bifurcation of the carotid. It ascends a little, andthen, passing downwards and forwards, forms a curve (Fig. 329).It soon disappears beneath the digastric and stylo-hyoid muscles,and running forwards under the hyo-glossus, and along the upperborder of the greater cornu of the hyoid bone, it reac
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