. A laboratory manual and text-book of embryology. Embryology. in m pf ol 0 pf 0. Fig. 315.—Brains of human embryos, from reconstructions by His: A, brain from fifteen-day em- bryo; B, from three-and-a-half-week embryo; C, from seven-and-a-half-week fetus; fb, ib, mb, hb, ab, fore-, inter-, mid-, hind-, and after-brain vesicles; 0, optic vesicle; ov, otic vesicle; in, infundibulum; m, mammillary body; pf, pontine flexure; IVv, fourth ventricle; nk, cervical flexure; ol, olfactory lobe; b, basilar artery; p, pituitary recess (American Text-Book of Obstetrics). walls the last eight cerebral nerv
. A laboratory manual and text-book of embryology. Embryology. in m pf ol 0 pf 0. Fig. 315.—Brains of human embryos, from reconstructions by His: A, brain from fifteen-day em- bryo; B, from three-and-a-half-week embryo; C, from seven-and-a-half-week fetus; fb, ib, mb, hb, ab, fore-, inter-, mid-, hind-, and after-brain vesicles; 0, optic vesicle; ov, otic vesicle; in, infundibulum; m, mammillary body; pf, pontine flexure; IVv, fourth ventricle; nk, cervical flexure; ol, olfactory lobe; b, basilar artery; p, pituitary recess (American Text-Book of Obstetrics). walls the last eight cerebral nerves take their origin. Its cavity forms the greater part of the fourth ventricle which opens caudally into the central canal of the spinal cord, cranially into the cerebral aqueduct. The increase in the flexures of the brain and the relative growth of its different regions may be seen by comparing the brains of embryos of the third, fourth, and eighth weeks (Fig. 315). In the following table are given the primitive subdivisions of the neural tube and the parts derived from them:. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prentiss, Charles William, 1874-1915. Philadelphia, London, W. B. Saunders
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