Question

E. Cerebrospinal Fluid You should be able to trace the path of the cerebrospinal fluid from its point of origin to where it is reabsorbed into the blood. If you can complete the following paragraph without referring to the text, you know the sequence fairly well. If you can state the sequence from memory, better yet. Ventricles Structures lateral-1 arachnoid granulations-10 third-2 cerebellum-11 fourth-3 cerebrum-12 Passageways choroid plexus—13 acoustic meatus cisterna cerebellomedullaris-14 cerebral aqueduct-5 cisterna superior-15 foramen magnum-6 dura mater-16 interventricular foramen-7 sagittal sinus--17 lateral aperture-8 septum pellucidum—18 median aperture-9 subarachnoid space—19 Cerebrospinal fluid is secreted into each ventricle by a From the 2 ventricles, which are located in the cerebral hemi- spheres, the fluid passes to the 3 ventricle through an opening called the 4 A canal, called the 5, allows the fluid to pass from the latter ventricle to the 6 ventricle. From this last ventricle the cerebrospinal fluid passes into a subarachnoid space called the 7 through three foramina: one 8 and two 9. From this cavity the fluid passes over the cerebellum into another subarachnoid space called the 10_. It also passes 11 (up, down) the posterior side of the spinal cord and 12_ (up, down) the anterior side of the spinal cord. From the cisterna superior the cerebrospinal fluid passes to the subarachnoid space around the 13_. This fluid is reabsorbed back into the blood through delicate structures called the 14. The blood vessel that receives the cere- brospinal fluid is the 15 470 E 9 10 11 12. 3. 14. 5.

Answer 1

Answers in order.

1. choroid plexus.
2. Lateral.
3. Third.
4. Interventricular foramen.
5. Cerebral aqueduct.
6. Fourth.
7. Cisterna cerebellomedullaris.
8. Median aperture.
9. Lateral aperture.
10. Cisterna superior.
11. Down.
12. Up.
13. Cerebrum.
14. Arachnoid villus.
15. Internal jugular vein.

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