Archive image from page 415 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 404 TEE CEREBRAL CONVOLUTIONS cover in the floor of the fossa completely, the groove which marks the line of their contact forming the lateral cerebral fissure, while the floor of the fossa becomes known as the insula. The first of the secondary fissures to appear is the sulcus cinguli, which is formed about the middle of the fifth month on the mesial surface of the hemispheres, lying parallel to the anterior portion of the hippocamp
Archive image from page 415 of The development of the human. The development of the human body : a manual of human embryology . developmentofhum00mcmu Year: 1914 404 TEE CEREBRAL CONVOLUTIONS cover in the floor of the fossa completely, the groove which marks the line of their contact forming the lateral cerebral fissure, while the floor of the fossa becomes known as the insula. The first of the secondary fissures to appear is the sulcus cinguli, which is formed about the middle of the fifth month on the mesial surface of the hemispheres, lying parallel to the anterior portion of the hippocampal fissure and dividing the mesial surface into the gyri marginalis and fornicatus. A little later, at the beginning of the sixth month, several other fissures make their appearance upon ptc Fig. 243.—Cerebral Hemisphere oe an Embryo of about the Seventh Month. fs, Superior frontal sulcus; ip, interparietal; IR, insula; pet, inferior pre-central; pes, superior pre-central; ptc, post-central; R, central; S, lateral; t1, first temporal.— {Cunningham ) the outer surface of the pallium, the chief of these being the central sulcus, the inter-parietal, the pre- and post-central, and the temporal sulci, the most ventral of these last running parallel with the lower portion of the hippocampal fissure and differing from the others in forming a ridge on the wall of the ventricle termed the collateral eminence, whence the fissure is known as the collateral. The position of most of these fissures may be seen from Fig. 243, and for a more
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