NERVE-CELLS IN THE MAMMALIAN SPINAL-CORD. 
47 
in the upper cervical region appears to represent there the vesicular column of Clarke, 
even with this group as a guide to the probable position of Clarke’s column, I have 
never been able to satisfy myself that in the redistribution and dislocation of grey 
matter, that can be followed out in a series of sections passing upward into the bulb, 
the vagus nucleus is continuous with the up])er part of Clarke’s column, or that its 
position is that which the upper extremity of Clarke’s column would assume. 
Neither does the histological appearance of the vagus nucleus altogether favour, in my 
opinion, the view that it represents Clarke’s column. Its cells appear to resemble 
more closely, in form and arrangement, the smaller fusiform cells of the lateral horn of 
the cord—such as, for instance, are seen in fig. 4, Plate 3. On the other hand, the 
cells of the cuneate nucleus do much resemble, in form and arrangement, the cells of 
the vesicular column of the cord. 
Explanation of Plates 3, 4. 
Figure 1, Plate 3. Portion of the anterior column adjacent to the mesial edge of the 
anterior grey cornu. Tri-radiate nerve-cell lying between the fasciculi of white 
matter. From a section, stained with carmine, and prepared from the cord of 
the Dog, between the 1st and 2nd cervical nerve-roots. Camera lucida and 
apochromatic immersion (Zeiss), with ocular 4. 
Figure 2, Plate 4. Portion of the anterior column adjacent to the mesial edge of the 
grey cornu. Tri-radiate nerve-cell lying between fasciculi of white matter. A 
larger nerve-cell belonging to the inner group of the grey cornu is seen. 
Weigert hasmatoxylin preparation, from the cord of a full-term human foetus, 
at the level of the 5th lumbar nerve-root. Camera lucida and Zeiss apochro¬ 
matic immersion, with ocular 4. 
Figure 3, Plate 3. Out-lying cells in the latei-al column, near the cell-group of the 
lateral horn. At level of 8 th thoracic nerve-root of Macacus ; stained with 
aniline blue-black. Camera lucida and Zeiss apochromatic immersion, with 
ocular 4. 
Figure 4, Plate 3. Out-l_ying cells in the lateral column in the neighbourhood of the 
lateral grey cornu. Picro-carmine pmparation, from human cord at the level 
of the 7th cervical nerve-root. Camera lucida and Zeiss objective BB, ocular 2. 
Figure 5, Plate 4. Out-lying cells in the lateral column, outside the formatia reticu¬ 
laris. Weigert haematoxylin preparation, from cord of young Macacus. 
Zeiss objective a, ocular 4. 
Figure 6, Plate 4. Out-lying cell in the posterior column. Two cells ol Clarke’s 
column in the grey matter. Weigert heematoxylin preparation from human 
cord at level of 12th thoracic nerve-root. Camera lucida and Zeiss apochro¬ 
matic immersion, with ocular 4. 
