A NOTE ON THE SULCUS LUNATUS IN MAN 
DAVIDSON BLACK 
From the Central Dutch Institute for Brain Research in Amsterdam and the Anatom- 
teal Laboratory, Western Reserve University, School of Medicine, 
Cleveland, Ohio 
THREE FIGURES 
Through the courtesy of Dr. Ariéns Kappers, I am able to 
record here a very beautiful example of a sulcus lunatus occur- 
ring in a new-born European babe, from the collection of the 
Central Dutch Institute for Brain Research. 
While recognizing that the occurrence of a sulcus lunatus in 
some form is frequent rather than exceptional in European brains, 
justification for the publication of the present note lies in the 
fact that the description of this typical specimen affords an 
opportunity for making certain preliminary remarks which appear 
necessary through the publication by Dr. van Valkenburg 
(1) of his views on this sulcus. The case is but one of those 
which have come under observation in the course of an investi- 
gation on the subject of the sulcus lunatus, the data and the 
results of which, should they warrant such action, it is pro- 
posed to publish at a later date. 
This specimen, more especially on the left side, presents a 
typical picture of the general morphological relations of the 
human lunate sulcus (figs. 1 and 2). 
On the right side (fig. 3), the caudal end of the interparietal 
sulcus (B.N.A.) is joined to a furrow which passes in a sagittal 
direction behind the mesial edge of the sulcus lunatus. In 
other words, the sulcus occipitalis transversus does not lie wholly 
in front of the lunate sulcus as is usually the case. 
On both sides the sulcus praelunatus is small, but its course - 
frontad between the lateral extremity of the transverse occipital 
furrow and the mesial side of the sulcus occipitalis inferior, leaves 
no doubt as to its identity. 
129 
THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL. 25, No. 2 
APRIL, 1915 
