Cranial Fossae Flashcards

Explore the three cranial fossae, their bony boundaries, brain relationships, foramina, neurovascular contents, and clinical landmarks.

Card 1 of 30Question

What are the cranial fossae?

Three depressions on the internal surface of the cranial base that accommodate and support different regions of the brain.

In This Section

1. What are the cranial fossae?

Three depressions on the internal surface of the cranial base that accommodate and support different regions of the brain.

2. What are the three cranial fossae?

The anterior, middle, and posterior cranial fossae.

3. Which cranial fossa is the shallowest?

The anterior cranial fossa.

4. Which bones form the anterior cranial fossa?

The frontal bone, ethmoid bone, and lesser wings and anterior body of the sphenoid bone.

5. Which parts of the brain occupy the anterior cranial fossa?

The frontal lobes of the cerebral hemispheres.

6. What forms the posterior boundary of the anterior cranial fossa?

The posterior borders of the lesser wings of the sphenoid and the anterior clinoid processes, with the sphenoidal limbus centrally.

7. Which cranial nerve fibers pass through the cribriform plate?

The olfactory nerve fibers (cranial nerve I).

8. What is the crista galli?

A midline projection of the ethmoid bone that provides attachment for the falx cerebri.

9. Which bones form the middle cranial fossa?

The sphenoid bone and the squamous and petrous parts of the temporal bones.

10. Which cerebral lobes occupy the lateral portions of the middle cranial fossa?

The temporal lobes.

11. What forms the posterior boundary of the middle cranial fossa?

The superior borders of the petrous temporal bones and the dorsum sellae of the sphenoid bone.

12. Which structure occupies the hypophyseal fossa of the sella turcica?

The pituitary gland.

13. Which structures pass through the optic canal?

The optic nerve (cranial nerve II) and ophthalmic artery.

14. Which cranial nerves pass through the superior orbital fissure?

The oculomotor (III), trochlear (IV), ophthalmic (V1), and abducens (VI) nerves.

15. Which nerve passes through the foramen rotundum?

The maxillary nerve (V2).

16. Which nerve passes through the foramen ovale?

The mandibular nerve (V3).

17. Which major artery passes through the foramen spinosum?

The middle meningeal artery.

18. What is the relationship of the internal carotid artery to the foramen lacerum?

It crosses the superior aspect of the foramen after emerging from the carotid canal, rather than passing vertically through it.

19. Which dural venous sinus lies on either side of the sphenoid body?

The cavernous sinus.

20. Which cranial nerve passes through the middle cranial fossa beneath the trigeminal ganglion?

The motor root of the trigeminal nerve (cranial nerve V), which joins the mandibular division.

21. Which cranial fossa is the deepest and largest?

The posterior cranial fossa.

22. Which bones form the posterior cranial fossa?

Primarily the occipital and temporal bones, with a contribution from the sphenoid bone.

23. Which major brain structures occupy the posterior cranial fossa?

The cerebellum, pons, and medulla oblongata.

24. What is the clivus?

A sloping bony surface formed by the sphenoid body and basilar occipital bone that supports the brainstem.

25. Which major structures pass through the foramen magnum?

The medulla-spinal cord junction, vertebral arteries, spinal arteries, and spinal roots of the accessory nerve.

26. Which cranial nerves enter the internal acoustic meatus?

The facial nerve (VII) and vestibulocochlear nerve (VIII).

27. Which cranial nerves pass through the jugular foramen?

The glossopharyngeal (IX), vagus (X), and accessory (XI) nerves.

28. Which cranial nerve exits the posterior cranial fossa through the hypoglossal canal?

The hypoglossal nerve (cranial nerve XII).

29. Which dural fold separates the cerebellum from the occipital lobes?

The tentorium cerebelli.

30. Why can fractures of the anterior cranial fossa cause cerebrospinal fluid rhinorrhea?

Damage to the cribriform plate and adjacent meninges can create a pathway for cerebrospinal fluid to enter the nasal cavity.