File:His1897 plate03.jpg

Plate III

Fig. 16. Transverse section through the spinal part of the neural tube of a human embryo of four weeks. It shows the early condition of the roots of a spinal nerve. A diagrammatic representation of this is given in Fig. 2 in the text.

c.c. Central canal of neural tube.

m.r. Motor fibres from the neuroblasts in the wall of the tube, growing out to form the anterior nerve-root.

S.G. Spinal ganglion, from the cells of which the fibres grow into the wall of the neural tube and thus form the posterior nerve-root.

Fig. 17. Section through a portion of the wall of the brain tube at the level of the origin of the fifth cranial nerve. It has been found necessary to turn this figure round on its side so as to make it fit into the plate.

w. Wall of the brain-tube.

G.G. Gasserian ganglion. x.r. Sensory root, formed of fibres growing out from the cells of the ganglion and entering the wall of the neural tube. a.T. The same fibres as represented by s.r. cut transversely owing to their having turned downwards to form the spinal root of the fifth nerve.

m.n. Neuroblasts of the motor nucleus of the fifth nerve giving origin to the motor fibres m.r . which are seen growing out from the neural wall. m.r. Fibres of the motor root of the fifth nerve.

Human embryo of four weeks.

• 

  Fig. 16. Transverse section through the spinal part of the neural tube of a human embryo of four weeks. It shows the early condition of the roots of a spinal nerve. A diagrammatic representation of this is given in Fig. 2 in the text (p. 5).

• 

  Fig. 17. Section through a portion of the wall of the brain tube at the level of the origin of the fifth cranial nerve. Jt has been found necessary to turn this figure round on its side so as to make it fit into the plate.

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Reference

His W. Address upon the development of the brain. (1897) Trans. Royal Acad. Medicine Ireland.

Cite this page: Hill, M.A. (2024, April 27) Embryology His1897 plate03.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:His1897_plate03.jpg

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