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Encyclopedia > Median aperture

The Median Aperture of the brain (apertura medialis ventriculi quarte) or Foramen of Magendie is an opening in the hollow nerve tube, connecting the 4th ventricle of the brain with the subarachnoid space In the anatomy of animals, the brain, or encephalon, is the supervisory center of the nervous system. ... The ventricular system is a fluid conducting system within the brain. ... The meninges (singular meninx) are the system of membranes that contain the brain. ...

The median aperture along with the paired lateral apertures (foramina of Luschka) are the primary routes for cerebrospinal fluid to escape into the cerebellomedullary cistern. Cerebrospinal fluid (CSF) is a clear bodily fluid that occupies the subarachnoid space in the brain (the space between the skull and the cerebral cortex—more specifically, between the arachnoid and pia layers of the meninges). ...

The Foramen of Magendie is named for Fran├žois Magendie, who first described it.


  • Netter, Frank H. (1989) Atlas of Human Anatomy. Summit, NJ: Ciba-Geigy Corporation.
  • Williams, Peter L.; Warwick, Roger; Dyson, Mary; & Bannister, Lawrence H. (1989) Gray's Anatomy (37th ed.). New York: Churchill Livingstone.

  Results from FactBites:
Dissector Answers - Scalp, Cranial Cavity, Meninges, & Brain (2511 words)
Diaphragma sellae is a circular, horizontal fold of dura that forms the roof of the sella turcica, covering the pituitary gland.
It is perforated by a small median aperture, and two lateral apertures that allow cerebrospinal fluid to exit the ventricular system and bathe the brain and spinal cord.
It leaves this ventricle through its median and lateral apertures and enters the subarachnoid space, which is continuous around the spinal cord and brain.
2MASS All-Sky Data Release Explanatory Supplement: Data Processing (1826 words)
Aperture photometry is performed for each non-saturated source detection made on the Atlas Images to provide a reference to the absolute photometric scale for the profile-fit photometry, statistics on the detectability of an object, and as a back-up source of brightness information when profile-fitting fails to converge to a valid measurement.
To correct for the loss of light in the standard aperture, a curve-of-growth correction is applied to the measurements, and it is this corrected photometry that is listed in the standard aperture magnitudes (j_m_stdap, h_m_stdap, k_m_stdap) in the PSC source records.
The correction factor, in magnitudes, is the median difference between the 4´´ aperture magnitude and the magnitude in the aperture at which the magnitude differentials become indistinguishable from zero.
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