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Up until day 58 the cerebral hemisphere is smooth. Then an indentation appears which marks the position of the Fissura sylvia. The Sulcus rhinalis lateralis appears at day 68. At day 90 the following grooves are visible: the Sulcus suprasylvius, the Sulcus cinguli, the Sulcus splenialis, the Sulcus genualis, and the Sulcus corporis callosi. At this age, all the gyri associated with these sulci develop, although the gyri are well developed only after the grooves have formed. At day 110 the Sulcus ectosylvius, the Sulcus marginalis, and the Sulcus presylvius are visible, once again with their associated gyri appearing a short time thereafter. At day 130 the following grooves are visible: the Sulcus coronalis, the Sulcus cruciatus, the Sulcus ansatus, and the Sulcus endomarginalis. The cerebrum of the foetus at this stage has well developed gyri. At day 160 the Sulcus proreus, the Sulcus ectomarginalis, the Sulcus suprasplenialis, the Sulcus endosplenialis, the Sulcus calcarinus, and the Sulcus endogenualis have developed. The final groove to form is the Sulcus rhinalis medialis. Then the brain looks like that of the adult animal.

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The cingulate sulcus continues up until the appearance of the marginal ramus (mr), from whence it continues as the splenial sulcus (sps) (Vogt and others 1995; termed subparietal sulcus by Ono and others 1990)

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