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Fig 664 Transverse section of the medulla spinalis in the mid-thoracic region

Fissures and Sulci - An anterior median fissure and a posterior median sulcus incompletely divide the medulla spinalis into two symmetrical parts, which are joined across the middle line by a commissural band of nervous matter.

Anterior Median Fissure

(fissura mediana anterior) has an average depth of about 3 mm., but this is increased in the lower part of the medulla spinalis. It contains a double fold of pia mater, and its floor is formed by a transverse band of white substance, the anterior white commissure, which is perforated by bloodvessels on their way to or from the central part of the medulla spinalis.


Posterior Median Sulcus

(sulcus medianus posterior) is very shallow; from it a septum of neuroglia reaches rather more than half-way into the substance of the medulla spinalis; this septum varies in depth from 4 to 6 mm., but diminishes considerably in the lower part of the medulla spinalis.



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Reference

Gray H. Anatomy of the human body. (1918) Philadelphia: Lea & Febiger.


Cite this page: Hill, M.A. (2024, April 24) Embryology Gray0664.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Gray0664.jpg

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current12:51, 17 October 2012Thumbnail for version as of 12:51, 17 October 2012696 × 500 (123 KB)Z8600021 (talk | contribs)==Fig 664 Transverse section of the medulla spinalis in the mid-thoracic region== Fissures and Sulci - An anterior median fissure and a posterior median sulcus incompletely divide the medulla spinalis into two symmetrical parts, which are joined across t