. Chordate morphology. Morphology (Animals); Chordata. superior sagittal sinus diploic vein (anterior temporal), superior ophthalmic cavernous sinus internal maxillary posterior facial external maxillary {anterior facial) — lingual vein superior thyroid anterior jugular middle thyroid inferior thyroid. inferior sagittal sinus great cerebral vein sinus rectus superior petrosal sinus occipital vein occipital sinus transverse sinus sigmoid sinus posterior auricular vertebral posterior external jugular internal jugular external jugular -subclavian Figure 11-31. Veins of the head In man. (After Tan
. Chordate morphology. Morphology (Animals); Chordata. superior sagittal sinus diploic vein (anterior temporal), superior ophthalmic cavernous sinus internal maxillary posterior facial external maxillary {anterior facial) — lingual vein superior thyroid anterior jugular middle thyroid inferior thyroid. inferior sagittal sinus great cerebral vein sinus rectus superior petrosal sinus occipital vein occipital sinus transverse sinus sigmoid sinus posterior auricular vertebral posterior external jugular internal jugular external jugular -subclavian Figure 11-31. Veins of the head In man. (After Tandler) Paralleling the internal jugular but lying superficially in the neck is the external jugular vein. The branches of the external jugular drain most of the outer regions of the head. A posterior facial division, paralleling the superficial tem- poral artery, receives diploic veins from the skull bones. A large posterior auricular enters the skull at the mastoid foramen to connect with the transverse or sigmoid sinus. The large anterior facial vein, which parallels the external maxillary artery, has mandibular, inferior labial, superior labial, and orbitonasal branches. Draining a part of the blood of the anterior facial is an anterior jugular vessel, lying superficially in the neck, just lateral to the midline. The vessels of either side connect ventrally or posteriorly and are joined by a stem with the external jugular. The external jugulars join the subclavian veins, then fuse to form the superior vena cava. In the neck is also a vertebral vein, a reticulum of chan- nels enclosing the vertebral artery. This helps drain the oc- cipital region and the internal vertebral system. Lying within the brain cavity are bilateral channels with cavernous sinuses to either side of the sella turcica. Supe- rior and inferior ophthalmic veins and their branches con- nect with the cavernous sinus through the orbital fissure. There is a cross connection through the floor of the sella tur
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