118 FLORENCE R. SARIN 



1. The nucleus medialis 



2. The nucleus anterior 



3. The center median of Luys and the cup-shaped nucleus 



4. The nucleus ventro-lateralis — 



Medial part receiving the medial lemniscus 

 Lateral part connected with the cortex 



5. The nucleus dorso-lateralis not separated from the pulvinar 



6. The pulvinar 



7. The nucleus corporis geniculati medialis 



8. The nucleus corporis geniculati lateralis 



In stud3'ing the relations of the lemniscus to the thalamus, I 

 have found the work of ForeP most helpful and shall use his 

 familiar terms. At the very beginning, however, it will be well 

 to be clear about directions in the thalamus. In the first place, 

 the brain stem of the baby is more nearly at right angles to a 

 longitudinal axis of the cerebrum itself than that of the adult. 

 In describing the thalamus the difficult}^ of orientation is familiar 

 to all students of the subject and is due to the fact that the terms 

 dorsal and ventral as applied to the cerebrum itself are not the 

 same as dorsal and ventral for the brain stem, and the thalamus 

 comes at the point of transition. T shall use the terms ''dorsal" 

 and "ventral" in the thalamus in exactly the same sense as in the 

 brain stem, and hence shall speak of the lenticular nucleus as 

 ventro-lateral to the thalamus. It will be very necessary in 

 following Forel's desciption to note that his sections are frontal 

 to the adult brain, and hence oblique in the baby's brain. If, for 

 example, a line be drawn through the pons, the red nucleus and 

 the center median of Luys in my fig. 4 at about the direction 

 indicated by lines 53, it will correspond in general to Forel's fig. 

 5, plate 7. Therefore "dorsal" and "ventral," in the sense of 

 Forel's figures, are at an oblique angle to mine. 



To return to the relations of the medial lemniscus to the 

 thalamus, as the lemniscus curves around the red nucleus (no. 

 1 3) , it becomes impossible to separate it from fibres either from 

 the red nucleus itself or from fibres of the brachium conjunc- 



^ Forel, Untersuchungen ueber die Haubenregion und ihre oberen Verkniipfungen 

 im Gehirne des Menschen und einiger Saugethiere. Archiv fiir Psychiatrie und 

 Nervenkrankheiten. Bd. 7, 1877. 



