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 cortexâmore specifically, between the arachnoid and pia layers of the meninges). ...
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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