EXTRACT VIII. B. 



ON THE POSTERIOR OR COCCYGEAL GLANDULATURE 

 AND EXIT FROM THE CEREBRO-SPINAL LYMPH 

 CAVITY. 



THE third great outlet from the cerebro-spinal cavity 

 referred to, viz. the posterior, or peri-anal, and most probably 

 recto-anal as well, can be traced from an early stage of 

 the development of the embryo as the neurenteric canal, 

 which at a subsequent state of development becomes 

 separated into two distinct canals which in time become 

 respectively the cerebro-spinal and intestinal canals. 



In the inter-space formed by the process of separation 

 of these two canals the body called the coccygeal gland or 

 glomerulus is evolved or developed from the metamorphic 

 structures, and continues to secure and maintain a 

 connection between the separated cavities, by virtue of its 

 union with what may be described as other metamorphic 

 remains or transition structures. 



In our opinion the posterior outlet from the cerebro- 

 spinal cavity contended for is secured in the following 

 way and by the following means, viz. : In the matrix of 

 the texture of the dividing material, or wall of division, 

 are laid down, or rather more exactly, left, the following 

 structures which seem to represent, not survivals only, but 

 an organised system of vessels and organs whose office is 

 one of excretion from the posterior end of the cerebro- 

 spinal cavity, and whose continuity and integrity are 

 therefore of great importance, not only in regulating 

 intra-spinal pressure, but in providing a means by their 

 functional attributes of maintaining the moisture and 



