Method XX 135 



and thalamus opticus. Make a drawing illustrating the shape and 

 extent of the intraventricular portion of the nucleus caudatus. 



(t) Tractus opticus, chiasma opticum, thalamus opticus (pul- 

 vinar), radiatio occipito-thalamica, and lobus occipitalis. What 

 is the shape of the thalamus opticus ? 



(ji) Commissura anterior, nuclei caudatus and lentiformis, 

 capsula interna, and lobus temporalis. 



(e) Bulbus and tractus olfactorius, trigonum olfactorium, hip- 

 pocampus, fornix, corpus mamillare, and tuberculum anterius 

 thalami. What is the course of olfactory fibers to the temporal 

 lobe (uncus) ? 



(/) Pedunculus cerebri, capsula interna, nuclei caudatus 

 and lentiformis, corona radiata, and substantia corticalis. 



How may the cortical substance of the different lobes be 

 associated ? Note fibrae arcuatae cerebri (fibrae propriae) 

 associating neighboring gyri. 



VI. RECONSTRUCTIONS. 



Lay all the drawings in series, and, after careful study and 

 with the aid of descriptive texts, construct diagrams of the central 

 nervous system illustrating the course of the following neurone 

 systems or conduction pathways : 



{a) General sensory (ascending) nerve pathways from the 

 skin, etc., to the cerebral cortex (substantia corticalis cerebri). 



1. Sensory neurones of the first order: nervi spinales, 

 ganglia spinalia, radices posteriores (dorsal roots), funiculi 

 posteriores (gracilis and cutieatus). 



2. Sensory neurones of the second order: nucleus funiculi 

 gracilis, nucleus funiculi cuneati, fibrae arcuatae, decussatio 

 lemniscorum, lemniscus (fillet) , and thalamus. 



3. Sensory neurones of the third order: thalamus, capsula 

 interna, corona radiata, and gyri (centrales) cerebri. 



(b') Indirect sensory pathway via cerebellum : Ganglia 

 spinalia, radices posteriores, nucleus dorsalis (Clarke's column), 

 fasciculus cerebello-spinalis (direct cerebellar tract), fasciculus 

 antero-lateralis (Gowers' tract), corpus restiforme, nucleus den- 



Digitized by Microsoft® 



