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Third ventricle

third ventricle

A narrow, vertically oriented, irregularly quadrilateral cavity in the midplane, extending from the lamina terminalis to the rostral opening of the mesencephalic aqueduct. This ventricle communicates at its rostrodorsal corner with each of the two lateral ventricles through the left and right interventricular foramen of Monro. Its narrow roof is formed by the tela choroidea which is attached on either side to the tenia thalami; its lateral wall by the medial surface of the thalamus and, below the hypothalamic sulcus, by the hypothalamus which also forms its floor. In lateral profile, the third ventricle exhibits a number of recesses: in its floor, from before backward, 1) the preoptic recess in the acute angle between the base of the lamina terminalis and the dorsum of the optic chiasm, 2) the infundibular recess extending ventrally into the infundibulum but (in humans) not into the hypophysial stalk, and 3) the mamillary or inframamillary recess caused by the protrusion of the mamillary bodies into the ventricle. From its dorsocaudal corner, the pineal recess extends caudally into the pineal stalk.

Synonym: ventriculus tertius, diacele, ventricle of diencephalon.


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biology

... over 360 heart beats in 7 minutes with each beat divided into 24 intervals for analysis. The end diastolic radioactivity detected from the left ventricle was 6400 counts and the end systolic was 3600 counts. Upon calibration the heart was found to eject an average of 50mls per beat. During the ...

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by zak
Wed Dec 18, 2013 11:20 am
 
Forum: Human Biology
Topic: biology
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Views: 3248

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... cardiac output. ) shunts unoxygenated blood directly from the right to the left side of the circulation. causes regurgitation between atrium and ventricle. reduces the oxygen carrying capacity of the blood. is a symptom, not a cause. is not associated with left sided heart failure. is associated ...

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Fri Nov 22, 2013 6:44 pm
 
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How does blood is circulated in amphibians?

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Mon Jul 23, 2012 2:00 pm
 
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