A manual of operative surgery . the neck of theinferior maxilla. It is somewhat tortuous, but when renderedstraight measures about two and three-quarter inches. Itdiminishes rapidly in size as it ascends. About its origin it is covered only by the integuments, theplatysma, and the cervical fascia, and at the same part it isoverlapped by the sterno-mastoid muscle. It soon becomesdeeply placed, and passes beneath the digastric and stylo-hyoidmuscles, and ultimately through a portion of the parotid its upper part it is separated from the internal carotid bythe styloid process, the stylo-
A manual of operative surgery . the neck of theinferior maxilla. It is somewhat tortuous, but when renderedstraight measures about two and three-quarter inches. Itdiminishes rapidly in size as it ascends. About its origin it is covered only by the integuments, theplatysma, and the cervical fascia, and at the same part it isoverlapped by the sterno-mastoid muscle. It soon becomesdeeply placed, and passes beneath the digastric and stylo-hyoidmuscles, and ultimately through a portion of the parotid its upper part it is separated from the internal carotid bythe styloid process, the stylo-pharyngeus muscle, and the glosso-pharyngeal nerve. At the lower edge of the digastric muscle the hypoglossalnerve crosses in front of the artery. Below this nerve the facial chap, in] LIGATURE OF THE EXTERNAL CAROTID 383 and lingual veins cross the vessel on its anterior aspect. Some-way above the digastric the glosso-pharyngeal nerve passesobliquely behind the external carotid. The inframaxillary Neck of condyle oflower Upper margin ofthyroid cartilage. FIG. 328.—EXTERNAL CAROTID ARTERY, NATURAL SIZE. {Modifiedfront Quai/t.) and/./., Anterior and post, temporal arteries ; , Transverse facial; , Internalmaxillary;/, Pharyngeal; o, Occipital; , Posterior auricular ; f. Facial; t, Tonsillar;, Palatine; , Sterno-mastoid ; , Ascending pharyngeal; /, Lingual; hy,, Hyoidbranch; , Superior thyroid; Its hyoid branch; A, Site of ligature of externalcarotid ; D, Digastric muscle ; , Glosso-pharyngeal nerve ; , Hypoglossal nerve ;, Superior laryngeal nerve. branches of the facial nerve are superficial to the artery abovethe digastric. The superior laryngeal nerve is placed obliquelybehind the vessel near its origin. The anterior division of the temporo-maxillary vein may pass 384 OPERATIONS ON ARTERIES [part v with the artery beneath the digastric muscle. More usually itlies superficially to that vessel. The superior
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