Archive image from page 643 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 630 NERVOUS SYSTEM. (NERVOUS CENTRES. THE MENINGES.) In front of the dura mater and situate between the outer edge of the posterior common liga- ment of the vertebrae and the pedicles, we find two remarkable venous sinuses which extend the whole length of the vertebral column, from the occipital foramen to the sacral region (Jig. 360). Fig. 360. Spinal sinuses viewed from before. (After Breschet.) The anterior part of the basis cranii and the face have been
Archive image from page 643 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 630 NERVOUS SYSTEM. (NERVOUS CENTRES. THE MENINGES.) In front of the dura mater and situate between the outer edge of the posterior common liga- ment of the vertebrae and the pedicles, we find two remarkable venous sinuses which extend the whole length of the vertebral column, from the occipital foramen to the sacral region (Jig. 360). Fig. 360. Spinal sinuses viewed from before. (After Breschet.) The anterior part of the basis cranii and the face have been removed, as also the bodies of the vertebrae. /, lateral sinus descending to form its junction •with the jugular vein; c, cavernous sinus; v, ver- tebral artery, the longitudinal sinuses with their transverse connecting veins, lying immediately be- hind the bodies of the vertebrae. The interior petrosal and the cavernous sinuses appear like con- tinuations of them within the cranium, and the transverse and circular sinuses are analogous to the transverse spinal branches. These veins are loosely covered by a thin pro- cess, which is prolonged from each margin of the posterior common ligament, and which is sufficiently transparent to allow them to be seen through it without removing it. They have been known since the time of Fallopius, and were described by Willis as the longitudinal spinal sinuses. In calibre they present many inequalities, being dilated at one part and con- stricted at another, according to the number and size of the vessels which communicate with them. The sinuses of opposite sides run parallel to each other and communicate by cross branches, which pass between the posterior sur- face of the body of each vertebra and the pos- terior common ligament. These cross branches present the same characters as the sinuses them- selves, being of variable calibre, and presenting the greatest degree of dilatation at their middle. At tin's point these branches receive
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