2l6 



THE CEREBRUM. 



to the cortex. Flechsig has found that in development it is built 

 up of six distinct strands of fibers, which receive their medullary 

 sheaths one after the other; and he names the bundles, according 

 to the order of their medullation, after the first six letters of the 

 Greek alphabet (see page 232). 



(4) The frontal stalk (Fig. 70) streams from the anterior end 

 of the lateral nucleus via the frontal part of the internal capsule. 

 Its fibers end in the corpus striatum and the frontal cortex. In 



Fig. 69. Section of the mid-brain cutting the inferior colliculi of the corpora 

 quadrigemina. (Original.) 



a. Sulcus lateralis. b. Formatio reticularis. c. Medial longitudinal bundle, d. Nucleus 

 of colliculus inferior, e. Aqueductus cerebri. f. Rubro-spinal tract, g. Lateral fillet, h. 

 Medial filliet. i. Basis pedunculi. j. Location of anterior longitudinal bundle, k. Interpedun- 

 cular fossa. 1. Substantia nigra. m. Decussation of brachia conjunctiva. 



the globus pallidus they are probably relayed to the somaesthetic 

 cortex. 



The ventral, parietal and frontal stalks of the thalamus con- 

 stitute the cortical fillet; the parietal stalk, high up, contains nearly 

 all the common sensory corticipetal fibers and, alone, is often 

 called cortical fillet. The cortical fillet carries common sensations 

 received from the medial fillet, the spino-thalamic tract, the 

 medial longitudinal bundle and the brachium conjunctivum 



