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You are watching: The third and fourth ventricles are linked by the

Purves D, Augustine GJ, Fitzpatrick D, et al., editors. Neuroscience. Second edition. Sunderland (MA): Sinauer Associates; 2001.


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The cerebral ventricles are a collection of interconnected, fluid-filled spaces that liein the core of the forebrain and also brainstem (Figure1.17). The existence of ventricular spaces in the various subdivisions ofthe mind reflects the truth that the ventricles space the adult derivatives the theopen room or lumen that the embryonic neural tube (see chapter 22). Although they have actually no distinct function, theventricular spaces existing in sections with the brain provide one more usefulguide to location. The largest of this spaces are the lateralventricles (one within each of the cerebral hemispheres). Theseparticular ventricles are best seen in frontal sections, where their ventral surfaceis usually defined by the basal ganglia, their dorsal surface by the corpus callosum, and also their medial surface by the septum pellucidum, amembranous tissue sheet the forms part of the midline sagittal surface ar of thecerebral hemispheres. The third ventricle creates a narrow midline spacebetween the right and left thalamus, and also communicates v the lateral ventriclesthrough a small opening in ~ the anterior finish of the 3rd ventricle (called theinterventricular foramen). The 3rd ventricle is constant caudally through thecerebral aqueduct, which runs though the midbrain. In ~ its caudal end, the aqueductopens right into the fourth ventricle, a larger space in the dorsal pons and medulla. Thefourth ventricle narrows caudally to form the main canal of the spinal cord. Theventricles room filled with cerebrospinal fluid, and the lateral, third, and fourthventricles space the website of the choroid plexus, i beg your pardon produces this fluid. Thecerebrospinal fluid percolates through the ventricular system and flows right into thesubarachnoid room through perforations in the thin extending of the fourthventricle; the is eventually soaked up by committed structures dubbed arachnoidvilli or granulations (see number 1.18), andreturned to the venous circulation.

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Figure 1.17

The ventricular device of the human brain. (A) location of the ventriclesas checked out in a transparent left lateral view. (B) Table reflecting theventricular spaces associated with each of the significant subdivisions of thebrain. (See thing 22 foran account (more...)


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Figure 1.18

The meninges. Upper left panel is a midsagittal view mirroring the threelayers that the meninges in relation to the skull and also brain. Right panelsare blowups to show detail.


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