G4 LABORATORY OUTLINE OP NEUROLOGY 



IV; Herrick ('18), Chapter III; Meyer ('98); Quain ('09), Vol. 

 3, Pt. 1, pp. 21-42; Starr, Strong and Learning ('96). 



64. Make a composite drawing of one-half of a section of the 

 spinal cord from Weigert and Nissl (or toluidin blue) sections 

 to show the arrangement of both white matter and nerve-cells. 

 See Herrick ('18), Figs. 57, 58; Morris ('14), Fig. 616, pp. 778, 

 779; Villiger ('12), Fig. 94, p. 91. Draw the outline and the 

 details of the white matter from a Weigert section and the 

 details of the gray matter from a Nissl section. Label fully all 

 parts, particularly the cell clusters (" nuclei"). Note the rela- 

 tions of the non-nervous elements (ependyma, blood-vessels, 

 connective tissue), neurons, their cell bodies (perikarya) and 

 processes, and the myelinated nerve-fibers. In the gray 

 matter (substantia grisea) identify and designate the columns : 

 columna grisea ventralis (ventral horn), columna grisea later- 

 alis (lateral horn), columna grisea dorsalis (dorsal horn), the 

 substantia gelatinosa of Rolando, the nucleus thoracalis in the 

 thoracic region (nucleus dorsalis Clarkii of the B N A, posterior 

 vesicular column of Clarke, Clarke's column), the reticular 

 formation (formatio reticularis) . Identify the commissures: 

 commissura ventralis alba; commissura ventralis grisea; com- 

 missura dorsalis. 



The substantia alba (white matter) of each side is divided 

 anatomically by the emerging nerve-roots into three portions 

 named respectively funiculus dorsalis, lateralis, and ventralis 

 (Herrick ('18), Fig. 57). These funiculi are further subdivided 

 topographically into fasciculi (fasc. ventro-lateralis, etc.) which 

 are usually made up of fibers of diverse sorts. The real units of 

 spinal cord structure are the tracts, each of which is composed of 

 fibers of like connections and functions. (Neurologists often 

 use the words funiculus, fasciculus, and tract as synonyms, 

 with resulting confusion.) Your preparations present no ana- 

 tomical boundaries of the fasciculi and tracts. They have 

 been determined by physiological experimentation and the 

 study of degenerations following pathological lesions. 



65. Neurons of the cord. Lay out before you the four out- 

 line sketches through the spinal cord in the cervical, thoracic, 

 lumbar, and sacral regions, which have already been drawn. 

 Now in the Nissl (or toluidin blue) sections of the cord note the 



