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Two stages in the development of the human brain. A. Brain of an human embryo of the third week. B. Brain of an embryo of five weeks.

Development of Human Brain

Two stages in the development of the human brain. A. Brain of an human embryo of the third week. B.…

Showing the development of the cerebellum. A, Transverse section through the forepart of the cerebellum of a sheep embryo. B, Transverse section through the hinder part of the cerebellum of a sheep embryo. C, Cerebellum of a human fetus 17 cm long. D, Median section through cerebellum of sheep embryo 5 cm long.E, Median section through cerebellum of human fetus 17 cm long. Labels: 1, sulcus primarius; 2, sulcus above and afterwards behind the pyramid; 3, sulcus between pyramid and uvula; 4, great horizontal fissure; r.l., lateral recess ventricle IV; T, transverse groove in roof of ventricle IV.

Development of Cerebellum

Showing the development of the cerebellum. A, Transverse section through the forepart of the cerebellum…

Three stages in the development of the insula and the insular opercula.

Development of the Insula

Three stages in the development of the insula and the insular opercula.

Diagram to illustrate the development of the opercula which cover the insula. A, Sylian fossa before opercula begin to form. B, Fronto-paretal and temporal opercula wells advances. C, All the four opercula developed but not in opposition. Labels: F.P., fronto-parietal operculum; T, temporal operculum; F.R., frontal wall of fossa; O.R., orbital wall of fossa; F., frontal operculum; O, orbital operculum; s2, anterior horizontal limb of Sylvian fissure; s3, ascending limb; s4, posterior horizontal limb.

Development of the Opercula

Diagram to illustrate the development of the opercula which cover the insula. A, Sylian fossa before…