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OLF

Online Encyclopedia

Originally appearing in Volume V04, Page 403 of the 1911 Encyclopedia Britannica.

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OLF . TUBER * From Cal. R.C.S. See also:

England. constricted off, while just behind the openings of the foramina of See also:

Munro a constriction occurs which divides the prosencephalon into two secondary vesicles, the anterior of which, containing the foramina of Munro, is called the telencephalon, while the posterior is the thalamencephalon or diencephalon. A constriction also occurs in the See also:

HIND

hind vesicle or rhombencephalon, dividing it into an anterior See also:

PART

part, the metencephalon, from which the cerebellum is See also:

DEVELOPED

developed, and a posterior or myelencephalon, the See also:

PRIMITIVE

primitive medulla oblongata. At this See also:

STAGE (Fr. 6/age; from Lat. stare, to stand)

stage the See also:

general resemblance of the See also:

BRAIN (A.S. braegen)

brain to that of the See also:

LAMPREY

lamprey is striking. Before the secondary constrictions occur three See also:

VERTICAL (from Lat. vertex, highest point)

vertical flexures begin to See also:

FORM (Lat. forma)

form. The first is known as the cephalic, and is caused by the prosencephalon bending sharply downward, below and in front of the mesencephalon. The second is the cervical, and marks the See also:

PLACE (through Fr. from Lat. platea, street; Gr. IrAar6s, wide)

place where the brain ends and the See also:

SPINAL

spinal See also:

CORD (derived through the Fr. corde, from the Lat. chorda, Gr. xop(5rt, the string of a musical instrument)

cord begins; the concavity of this flexure is ventral. The third to appear has a ventral convexity and is known as the pontine, since it marks the site of the future pons Varolii; it resembles the permanent flexure in the reptilian brain. It will now be seen that the See also:

ORIGINAL

original neural See also:

canal, which is lined by ciliated epithelium, forms the ventricles of the brain, while superficial to this epithelium (ependyma) the See also:

grey and See also:

white See also:

MATTER

matter is subsequently formed.

It has been shown by His that the whole neural See also:

TUBE (Lat. tuba)

tube may be divided into dorsal or alar, and ventral or basal laminae, and, as the cerebral hemispheres bud out from the dorsal part of the anterior See also:

PRIMARY

primary vesicle, they consist entirely of alar laminae. The most characteristic feature of the human and anthropoid brain is the rapid and See also:

GREAT

great expansion of these hemispheres, especially in a backward direction, so that the mesencephalon and metencephalon are hidden by them from above at the seventh See also:

month of See also:

INTRA

intra-uterine See also:

LIFE

life.

End of Article: OLF

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