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T/F Cranial Fossa and Cavernous Sinus

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Posted by Ichneumia Rapidae on November 29, 2014 at 19:59:42:

1. The coronal suture and the sagittal suture meet at bregma. TRUE

2. Arachnoid granulations reside within bony topographies called the granular fovealae. TRUE

3. Separating the anterior cranial fossa from the middle cranial fossa is the anterior ridge of the chiasmatic groove. TRUE

4. The tuberculum sellea extends anterior and superior to end a the posterior ridge of the chiasmatic groove. TRUE

5. The posterior openings of the optic canals face into the middle cranial fossa. TRUE, optic foramen.

6. The superior petrosal ridge separated the middle cranial fossa from the posterior cranial fossa. TRUE "The superior border of the petrous part of the temporal bone separates the middle and posterior cranial fossae, and its grooved by the superior petrosal sinus" (BG: 424).

7.The frontal and parietal emissary veins drain the region of the frontal air sinus and the scalp into the superior sagittal sinus. TRUE? (BG: 432- emissary veins; 554- venous drainage of nasal cavity)

8. The inferior petrosal sinus drains from the cavernous sinus directly into the internal jugular vein. TRUE (BG:430)

9. The mastoid emissary vein connects intracranial venous drainage with the external vertebral venous plexus. TRUE, mastoid emissary vein: corrents sigmoid sinus with the posterior auricular (occipital veins) - these then form a single vein that enters into external vertebral venous plexus in the area of the suboccipital triangle (BG: 432).

10. The most anterior extent of the superior sagittal sinus may connect to the nasal cavity by way of the foramen cecum. TRUE (BG: 432) requires patent foramen cecum: nasal veins to superior sagittal sinus.

11. At the posterior extent of the tentorial notch is the meeting of the straight sinus with the inferior sagittal sinus. TRUE

12. The superior petrosal sinus connects the cavernous sinus with the transverse sinus. TRUE

13. The superior and inferior ophthalmic veins connect orbit with the cavernous sinus. TRUE, (BG:666, lol)

14. An emissary vein through the cartilage of the lacerate foramen connects the cavernous sinus to the pterygoid venous plexus. TRUE (BG: 430, 541-pterygoid venous plexus) <-RF

15. The inferior petrosal sinus connects the cavernous to the basilar venous plexus and then to the internal anterior vertebral venous plexus. TRUE, "The basilar sinus and plexus consist of interconnecting channels between layers of dura meter on the clivus. The basilar venous plexus interconnects the inferior petrosal sinuses and joins the internal vertebral venous plexus. It also usually connects with the cavernous and superior petrosal sinuses at its anterior end" (BG: 431- Basilar venous pelxus) <-RF

16. The sphenoparietal sinus connects the cavernous sinus to the region of the pterion. TRUE, middle meningeal vein does some of this as well

17. The anterior and posterior intercavernous sinuses connect one cavernous sinus to the other cavernous sinus. TRUE

18. The occipital sinus connects the confluence of the sinuses with the internal posterior vertebral venous plexus. TRUE

19. The marginal sinus surrounds the margin of the foramen magnum. TRUE (BG: 431)

20. The right transverse sinus tends have a larger diameter than the left transverse sinus. TRUE, especially if it is in cahoots with the Superior Sagittal Sinus (BG:425, 426)

21. The diaphragma sellae forms a dural shelf superior to the hypophyseal fossa and contains the intercavernous sinuses. TRUE

22. The greater superficial nerve, but not the lesser superficial petrosal nerve, extends into the lacerate foramen. TRUE

23. The facial, vestibulocochlear, glosspharyngeal, vagus, and hypoglossal nerves all leave the posterior cranial fossa to become extracranial. FALSE, CN:III doesnt leave cranium, I think?

24. The cribriform plate of the ethmoid bone is located in the anterior cranial fossa. TRUE

25. The clivus is part of the sphenoid bone. TRUE, "Anteriorly, the basilar part of the occipital bone is fused, and often indistinguishably, to the slanting posterior part of the body of the sphenoid bone; these parts together form the clivus" (HH:736).

26. The cavernous sinus has immediate drainages into the superior petrosal sinus, inferior petrosal sinus, basilar venous plexus, sphenoparietal sinus, ophthalmic vein, pterygoid venous plexus, and the intercavernous sinus. FALSE, cavernous sinus drains to pterygoid venous plexus via: Vein of Vesalius in sphenoidal emissary foramen or foramen of Vesalius. Does drain, not immediate, picky mongooses.

27. The straight sinus drains directly into the confluence of sinuses. TRUE

28. The basilar venous plexus is continuous with the internal (posterior) vertebral venous plexus. FALSE, anterior.

29. The lacus lacrimalis. Moats are for boats.

30. The great vein of Galen combines with the inferior sagittal sinus to form the straight sinus. TRUE

31. The emissary veins connect extracranial venous drainages with intracranial venous drainages. TRUE

32. Ligation of the internal jugular veins at the base of the skull does not block intracranial venous drainage. TRUE

33. The inferior sagittal sinus is within the inferior margin of the tentorium cerebelli. FALX.

34. The foramen cecum, when patent, provides a venous communication between the superior sagittal sinus and the nasal cavity. TRUE, nasal veins

35. The anterior free margin of the tentorium cerebelli forms the tentorial notch or incisura. TRUE

36. The superior petrosal sinus passes superior to the trigeminal nerve. TRUE? Wouldn't it be more posterior?

37. The repeating cascade of symptoms of cavernous sinus infection reflects, in part, spread of infection through the intercavernous sinus. TRUE

38. The intercavernous sinus surrounds the pituitary stalk. TRUE

39. The anterior lip of the chiasmatic groove defines, in part, the boundary between the middle and (inferior) cranial fossae. FALSE, anterior.

40. The turberculum sellae extends from the hypophyseal fossa to the posterior lip of the chiasmatic groove. TRUE

41. The clivus extends from the foramen magnum to the inferior margin of the dorsum sellae. TRUE

42. The lateral walls of the hypophyseal fossa are formed by the medial walls of the cavernous sinus. TRUE?

43. The occipital sinus is directly continuous with the (anterior) internal vertebral venous plexus. FALSE, posterior

44. The basilar venous plexus directly connects with the anterior internal vertebral venous plexus. TRUE

45. The superior orbital fissure marks the anterior boundary of the cavernous sinus. TRUE (BG: 429)

46. Structures that pass through the superior orbital fissure become a content of the cavernous sinus. TRUE (BG:430; Figure: 27.9)

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