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Brain of dog, viewed from above and in profile. F, frontal fissure sometimes termed crucial sulcus, corresponding to the fissure of Rolando in man. S, fissure of Sylvius, around which the four longitudinal convolutions are concentrically arranged; 1, flexion of head on the neck, in the median line; 2, flexion of head on the anterior limb; 5, 6, flexion and extension of posterior limb; 7, 8, 9, contraction of orbicularis oculi, and the facial muscles in general. The unshaded part in that exposed by the opening of the skull.

Brain of a Dog

Brain of dog, viewed from above and in profile. F, frontal fissure sometimes termed crucial sulcus,…

Brain of the Orangoutang, showing arrangement of the convolutions. Sy, fissure of Sylvius; R, fissure of Rolando; E P, external perpendicular fissure; Olf, olfactory lobe; Cb, cerebellum; PV, pons Varolii; MO, medulla oblongata. As contrasted with the human brain, the frontal lobe is short and small relatively, the fissure of Sylvius is oblique, the temporo-sphenoidal lobe very prominent, and the external perpendicular fissure very well marked.

Brain of the Orangutan

Brain of the Orangoutang, showing arrangement of the convolutions. Sy, fissure of Sylvius; R, fissure…

The name of an anthropoid ape, signifying "man of the woods," and native to Sumatra, Borneo, and Malacca. There is but one species of this class of apes.

Orang

The name of an anthropoid ape, signifying "man of the woods," and native to Sumatra, Borneo, and Malacca.…