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CNS: Anatomy #Meninges, Ventricles & CSF
Q1. All of the following statements regarding the meninges are TRUE, EXCEPT:
They provide a supporting framework for arteries and veins
They enclose a fluid-filled cavity containing CSF
They fuse with the epineurium of all cranial nerves at skull foramina
They consist of dura mater, arachnoid mater, and pia mater
Q2. Regarding the cranial dura mater, all of the following are correct, EXCEPT:
It is the toughest meningeal layer
It is a double-layered membrane
Its periosteal layer continues around the spinal cord
Dural venous sinuses lie between its two layers
Q3. All of the following statements regarding falx cerebri are correct, EXCEPT:
It is sickle-shaped
It occupies the longitudinal fissure
It separates the cerebellar hemispheres
It lies above the corpus callosum
Q4. Pain from the dura mater below the tentorium cerebelli is referred to the back of the head mainly due to innervation by:
Ophthalmic division of trigeminal nerve
Maxillary division of trigeminal nerve
Greater occipital nerve
Facial nerve
Q5. All of the following statements regarding arachnoid villi are correct, EXCEPT:
They project toward dural venous sinuses
They are avascular
They primarily drain CSF into the superior sagittal sinus
They are extensions of pia mater
Q6. Which of the following correctly describes the subarachnoid space?
A potential space between dura and arachnoid
A real space containing CSF and trabeculae
Located between skull and periosteal dura
Normally obliterated except in pathology
Q7. Lumbar puncture is contraindicated at or above L2 because of risk of injury to:
Cauda equina
Filum terminale
Spinal cord
Lumbar cistern
Q8. All of the following statements regarding the lateral ventricle are correct, EXCEPT:
It is C-shaped
The inferior horn lies within the temporal lobe
The posterior horn is always located in the occipital lobe
The caudate nucleus lies within its concavity
Q9. Which structure forms the floor of the body of the lateral ventricle?
Corpus callosum
Thalamus
Hippocampus
Caudate nucleus
Q10. All of the following are correct regarding the third ventricle, EXCEPT:
It is a slit-like cavity
It lies between the two thalami
Its floor is formed by the hypothalamus
It communicates directly with the subarachnoid space
Q11. All of the following statements regarding the cerebral aqueduct are true, EXCEPT:
It connects the third and fourth ventricles
It is the cavity of the midbrain
It contains choroid plexus
It is a narrow canal
Q12. The median aperture (foramen of Magendie) of the fourth ventricle opens into:
Central canal
Third ventricle
Subarachnoid space
Lateral ventricle
Q13. All of the following are components of the choroid plexus, EXCEPT:
Fenestrated endothelial layer
Pial membrane
Choroidal epithelial cells with tight junctions
Astrocytic end-feet
Q14. The valve-like function of arachnoid villi is due to:
Active transport of CSF
Compression of villous channels by venous pressure
Ciliary movement of ependymal cells
Secretion by choroid plexus
Q15. Which of the following structures is NOT correctly matched with its meningeal relationship?
Optic nerve — surrounded by meninges
Spinal nerve — fuses with epineurium at intervertebral foramen
Facial nerve — completely surrounded by meninges
Cranial nerves — fuse with epineurium at skull foramina
Q16. All of the following structures are involved in restricting rotatory displacement, EXCEPT:
Falx cerebri
Tentorium cerebelli
Denticulate ligaments
Arachnoid villi