re, but, in others, it extends for some distance more or less transversely outwards. I saw it in the right hemisphere of a female brain pass more than two inches outwards; and on another specimen, also the right hemisphere, it proceeded for four-tenths of an inch outwards, and then extended downwards, as far as the lower margin of the outer surface of the hemisphere. The imperfect definition of this fissure in the majority of human brains, as compared with its remarkable distinctness in the brain of most Quadrumana, is owing to the presence, in the former, of certain superficial, well marked, secondary convolutions which bridge it over and connect the parietal with the occipital lobe. The closer the first of these bridging gyri lies to the longitudinal fissure, the shorter is the external parieto-occipital fissure" (loc. cit. p. 12).
The obliteration of the external perpendicular fissure of Gratiolet, therefore, is not a constant character of the human brain. On the other hand, its full development is
2013 SFR GALAXY AWARD WINNER
"Heroism and... Read more
Fans of paranormal and urban fantasy will enjoy... Read more
VOLUME ONE in the WOOD COW CHRONICLES series. <... Read more
There are six secret clans across the world–Afr... Read more
Set in the late Georgian era, Elizabeth Bailey’... Read more
"Tim Hurtletuta has forgotten something. He can... Read more
12th century England: Two men vie for the thron... Read more
Dr. Gabe Allen has a rule about dating colleagues... Read more
The list of books below is based on the weekly downloads by our users regardless of eReader device or file format.
See more popular titles from this genre.