A system of human anatomy, general and special . the commencement ofthe internal jugular veins. The Circular sinus (sinus of Ridley)is situated in the sella turcica, surround-ing the pituitary gland, and communi-cating on each side with the cavernoussinus. The posterior segment is largerthan the anterior. The Superior petrosal sinuses pass ob-liquely backwards along the attachedborder of the tentorium, on the uppermargin of the petrous portion of the tem-poral bone, and establish a communi-cation between the cavernous and lateralsinus at each side. They receive oneor two cerebral veins from th
A system of human anatomy, general and special . the commencement ofthe internal jugular veins. The Circular sinus (sinus of Ridley)is situated in the sella turcica, surround-ing the pituitary gland, and communi-cating on each side with the cavernoussinus. The posterior segment is largerthan the anterior. The Superior petrosal sinuses pass ob-liquely backwards along the attachedborder of the tentorium, on the uppermargin of the petrous portion of the tem-poral bone, and establish a communi-cation between the cavernous and lateralsinus at each side. They receive oneor two cerebral veins from the inferiorpart of the middle lobes, and a cerebel-lar vein from the anterior border of thecerebellum. Near the extremity of the petrous bone these sinusescross the oval aperture which transmits the fifth nerve. The Transverse sinus (basilar, anterior occipital) passes transverselyacross the basilar process of the occipital bone, forming a communica-tion between the two inferior petrosal sinuses. Sometimes there aretwo sinuses in this VEINS OF THE NECK. The veins of the neck which return the blood from the head are the— * The sinuses of the base of the skull. 1. The ophthalmic veins. 2. The cavernoussinus of one side. 3. The circular sinus ; the figure occupies the position of the pituitarygland in the sella turcica. 4. The inferior petrosal sinus. 5. The transverse or anterioroccipital sinus. 6. The superior petrosal sinus. 7. The internal jugular vein. 8. Theforamen magnum. 9. The occipital sinuses. 10. The torcular Herophili. 11, 11. Thelateral sinuses. VEINS OF THE NECK. 365 External jugular, Internal jugular, Anterior jugular, Vertebral. The External jugular vein is formed by the union of the posteriorauricular vein with the temporo-maxillary, and commences at thelower border of the parotid gland, in front of the sterno-mastoid descends the neck in the direction of a line drawn from the angleof the lower jaw to the middle of the clavicle, crosses the
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectanatomy, bookyear1847
