Paper - Factors Involved In The Formation Of The Filum Terminale

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Streeter G.L. Factors Involved In The Formation Of The Filum Terminale 1919 Am J Anat. 22:1-11.

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Factors Involved In The Formation Of The Filum Terminale

George L. Streeter

From The Department Of Embryology, Carnegie Institutiftm Of Wash7Tn,Gt0N, Baltimore, Maryland.

Three Text Figures

In a study recently published by the writer1 on the development of the cartilaginous capsule of the ear in human embryos it was pointed out that the changes in size and form which the capsule undergoes during its development are accomplished not only by a progressive differentiation, but also in part by a retrogressive differentiation of its constituent tissues. The margins of the cartilaginous cavities are in a continual state of change; they exhibit an unstable equilibrium between two opposing tendencies: on one hand, toward the deposit of new cartilage, and on the other, toward the excavation of the old. The margins thereby are always advancing; or receding, and as a result of this there is provided a suitable suite of chambers for the contained membranous labyrinth in all stages of its development.

It is the feature of retrogressive differentiation or dedifferentiation that I wish particularly to recall here. The fact that certain areas of cartilaginous tissue'revert to an earlier embryonic type and are subsequently redifferentiated into a tissue of a Widely different histological character, is very clearly shown in the case of the otic capsule, and is a factor of great embryological significance. Such a process of retrogressive change, combined with redifferentiation of the same tissue, greatly in— creases the facilities for and the range of certain structural

1 Streeter, G. L., 1917. The factors involved in the excavation of the cavities in the cartilaginous capsule of the ear in the human embryo. Amer. Jour. Anat.,


Cite this page: Hill, M.A. (2020, August 14) Embryology Paper - Factors Involved In The Formation Of The Filum Terminale. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_Factors_Involved_In_The_Formation_Of_The_Filum_Terminale

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