Paper - The Peripheral Nervous System in the Human Embryo at the End of the First Month (10 mm)

Embryology - 19 May 2024        Expand to Translate
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Streeter G.L. The Peripheral Nervous System in the Human Embryo at the End of the First Month (10 mm) 8 Historic Embryology Papers

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The Peripheral Nervous System in the Human Embryo at the End of the First Month (10 mm)

By

George L. Streeter

P1‘ofcssm' of Anatomy, Um‘vcrsity of Michigan-, Ann Arbor.

(With 3 Plates And 1 Text Figure.)

The period of development under consideration represents the completion of what we may call the primary stage in the growth of the nervous system. The primary neurones forming the peripheral nerves are by the end of the first month well laid down; all their chief peripheral branches and plexuses are indicated, a11d centrally the nerve roots can be traced to their distribution in the brain and spinal cord, where the nuclei of the motor roots can be outlined and the sensory roots can be recognized as definite bundles extending up and down in the wall of the neural tube. The higher neurone systems, however, are still in a most rudimentary state, and in sections through the brain and cord at this time we see only the primary apparatus differentiated. Such co—ordinating centers as the pons, olive and cerebellum are still undeveloped, and the forebrain is not much more than an undifferentiated thin-Walled tube. It can thus be seen that the period with which we are dealing represents a definite stage in the growth of the nervous system, the stage of the primary brain, and a stage which is of particular importance for a proper conception of the embryology of this system.

A general view of the nervous system as it exists in embryos at the end of the first month is represented on Plate I. It can be seen that the‘ reconstruction shown there corresponds in age almost exactly with the well known His reconstruction of his embryo KO of 10.2 mm. N1. That investigator early recognized the significance of the stage of the primary brain. However, since His, ’88, published his monograph and description of the embryo KO there have been introduced many improvements in the methods of work, and before all others should be mentioned the Born wax plate procedure. It is with such

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Cite this page: Hill, M.A. (2024, May 19) Embryology Paper - The Peripheral Nervous System in the Human Embryo at the End of the First Month (10 mm). Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_The_Peripheral_Nervous_System_in_the_Human_Embryo_at_the_End_of_the_First_Month_(10_mm)

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