198 



HEAD AND NECK 



Postero-median septum 



Intermed. post, septum 

 Fasciculus gracilis 

 Fasciculus cuneatus 

 Substantia gela- 

 tinosa Rolandi 

 Lateral funiculus 



Central canal 



Anterior column 

 Grey commissure 

 Lntero-median fissure 

 Fila of anterior 

 nerve-root 

 Anterior funiculus 



Postero-median 

 septum 



Substantia Rolandi 

 Dorsal nucleus(O.T. 

 posterioi vesicular 

 column) 



Lateral column 

 Anterior column 

 Antero-median fissure 



posterior grey 

 column. A sec- 

 tion taken from 

 the centre of each 

 region can very 

 readily be recog- 

 nised by the 

 features men- 

 tioned. 



In the thoracic 

 region of the spinal 

 medulla, more 

 especially in the 

 upper part, there 

 is another char- 

 acter which is very 

 distinctive. A 

 pointed andpromi- 

 nent triangular 

 projection juts out 

 from the lateral 

 aspect of the cres- 

 centic mass of 

 grey matter nearly 

 opposite the grey 

 commissure. This 

 is called the lateral 

 grey column (Fig. 

 80, B and C). 

 It disappears in 

 the cervical and 

 lumbar swellings, 

 but again becomes 

 evident both in 

 the upper cervical 

 and in the lower 

 sacral regions. 



Below the 

 , ' " . 

 thoraClCreglOll 



the pOSterO-med- 



ian septum dimin- 

 ishes and the antero-median fissure increases in depth, until, 



Postero-median septum 

 Entering fila of 

 posterior nerve-root 



Dorsal nucleus 

 (O.T. posterior 

 vesicular column) 

 Lateral column 



Antero-median 

 fissure 



Postero-median 

 septum 



^ Antero-median 

 fissure 



FIG. 80. Transverse sections through the Medulla 

 Spinalis in different regions. A. Cervical Region ; 

 B. Mid -thoracic Region; C. Lower Thoracic 

 Region ; D. Lumbar Region. 



