THE NERVOUS SYSTEM 



1347 



the ventro-lateral and dorso-lateral sulci, with the corresponding 

 nerv-e-funiculi. These surface areas are called ventral, lateral, and 

 dorsal. 



Ventral or Anterior Area. — ^This superficial area is situated 

 between the ventral median fissure and the ventro-lateral sulcus 



Fig. 563. — The Decussation of the Pyramids. Scheme representing 

 THE Passage of the Various Tracts from the Spinal Cord to the 

 >rEDULLA (L. Testut's * Anatomie Humaine '). 



a. Pons Varolii 



6- Medulla Obloneata (anterior aspect) 



c. Decussation of the Pyramids 



d. Section of the Cervical Spinal Cord 



1. Direct Pyramidal Tract 



2. Crossed Pyramidal Tract 



3. Sensory Tract 



3'. Nucleus Gracilis et Nucleus Cuneatus 

 4. Antero-lateral Ground-Bundle 

 S- Anterior Pyramid 



6. Fillet 



7. Posterior Longitudinal Bundle 



8. Tract of Gowers 



9. Direct Cerebellar Tiact 



alorg which the funiculi of the h\^glcssal nerve emerge. It con- 

 stitutes the pyramid of the bulb. The two p^Tamids, right and 

 left, represent the motor tracts of the bulb. As regards position, 

 the pjTamid represents the anterior column of the spinal cord, and 



