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15 Step 11 Dural venous sinuses
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These videos have been excerpted from Netter’s Video Dissection Modules on Student Consult. http://bit.ly/2oEt9CO • Step 11 • On the external surface of the dura, identify the superior sagittal sinus. On its internal surface, find the torn ends of cerebral veins that enter this sinus. In the free margin of the falx cerebri, note the location of the inferior sagittal sinus and its connection to the straight sinus, together with the great cerebral vein of Galen, entering here. Posteriorly, note where the superior sagittal sinus, transverse sinuses, and occipital sinus converge with the straight sinus at the confluence of sinuses, at the level of the internal occipital protruberance. The position of the other sinuses can best be appreciated on the internal surface of the skull. From the confluence of sinuses, the transverse sinuses run laterally, draining to the sigmoid sinuses which exit via the jugular foramina. The superior petrosal sinus runs along the superior aspect of the petrous ridge and drains to the sigmoid sinus, while the inferior petrosal sinus can be found at the posterior base of the ridge and drains to the jugular foramen. The sphenoparietal sinuses run along the edges of the lesser wings of the sphenoid, and the cavernous sinuses are found on either side of the sella turcica. The cavernous sinuses are connected by a network of veins. The cavernous sinuses, superior petrosal sinuses, and the inferior petrosal sinuses are all interconnected by a basilar venous plexus. • Key Terms • • Dural venous sinuses: venous channels in the cranial cavity that lie between two layers of dura mater and are lined with endothelium N104. They receive cerebrospinal fluid via arachnoid granulations N103 N110 and blood from cerebral veins N145 N103 N146. They communicate with diploic veins N99, as well as with each other N105, and drain unto the internal jugular vein. The sinuses lack a smooth muscle tunic and are therefore unable to constrict. They occur where the dura mater is applied to bone, and because of this they are susceptible to injury when the associated bone is fractured. The named sinuses are the unpaired inferior sagittal sinus, straight sinus, superior sagittal sinus, occipital sinus, and the paired transverse sinuses, cavernous sinuses, superior petrosal sinuses, inferior petrosal sinuses, sigmoid sinuses and the sphenoparietal sinuses. • • ABOUT: The project was made possible by several very dedicated faculty and staff at University of North Carolina, Chapel Hill--especially O.W. Henson and Noelle A. Granger--and partner schools, and by a grant from the Fund for the Improvement of Post-Secondary Education of the US Department of Education. This channel includes over 400 short videos highlighting the steps in a full-body human dissection in the gross anatomy lab. Each step is narrated and key structures labeled.
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