. On the anatomy of vertebrates [electronic resource] . fissure, as in fig. 118, 13—\.The almost transverse fissure, fig. 116, 12, di-vides the large anterior from the middle the latter, however, may be recognised theshort tract, 7, mi, combining the medial ande medilateral folds, but more transversely disposed than in Carni-vora; pushed out, as it were, by the backward growth of lobe. Secondary fissures there indicate frontal, n, mid-frontal, n, and superfrontal, n, folds. One or two longitudinaloccipital fissures mark out corresponding folds, q, qf. The ecto-rhinal fiss
. On the anatomy of vertebrates [electronic resource] . fissure, as in fig. 118, 13—\.The almost transverse fissure, fig. 116, 12, di-vides the large anterior from the middle the latter, however, may be recognised theshort tract, 7, mi, combining the medial ande medilateral folds, but more transversely disposed than in Carni-vora; pushed out, as it were, by the backward growth of lobe. Secondary fissures there indicate frontal, n, mid-frontal, n, and superfrontal, n, folds. One or two longitudinaloccipital fissures mark out corresponding folds, q, qf. The ecto-rhinal fissure, fig. 111,2, sinking into the sylvian one, 5, may have acontinuation in the anteroposterior fissure, ib. 2, which divides thetf natiform protuberance into a medial or basirhinal, b, and a lateralmoiety,/. In most Catarhines the coronal fissure, 12, figs. 114,116, extends, from within, more obliquely forward and outward;the homologues of the platyrhine fissures and folds are clearlyseen, as marked by the figures and letters in Macacus and Cebus,. PROSENCEPHALON OF MAMMALS. 127 fig. 116. Secondary fissures subdivide the orbital as well as thefrontal and falcial surfaces of the anterior lobe: the surface restingon the orbital plate of the frontalbone, in the Orangs brain, , shows the following con-volutions :—6 postorbital, o, mid-orbital, o, entorbital, o, ect-orbital, o1, and antorbital, o*.That which lies external to therhinal fissure or depression is notsubdivided into ectorhinal andentorbital folds as in Man, , d, o. Similar secondarychinks furrow the occipital lobe,on the tentorial surface of whichthe tentorial fold, fig. Ill, r,the entotentorial, and ecto-tentorial, r, are noAV defined bythe fissures, is, i8r, is7. Thesefolds are more or less continuous with the basirhinal, b, and sub-sylvian, f, tracts. The increasing number of secondary fissuresand the greater depth and more winding course of the pri-mary ones mainly characterise the brain in the Ora
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