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MANUAL OF HISTOLOGY. 



a - 



ventitia, but containing comparatively more nuclei than that 

 structure. 



The inter carotid gland differs from the coccygeal in its 

 larger size, and because it contains accumulations of ganglionic 

 nerve-cells. These are derived from the carotid plexus. Here 

 the vascular sacculi also more nearly resemble dilated capilla- 

 ries, whereas in the other body they approach the arterial type. 

 In all other respects the structure of these vascular plexuses 

 is identical. Some authors regard the spleen and the supra- 

 renal capsule as belonging to this group of blood-vascular 

 glands. The author sees no necessity for so considering them, 



and the subject may 

 therefore be dis- 

 missed without fur- 

 ther comment. 



Corpora caverno- 

 sa. They consist in 

 great part of dilated 

 blood-vessels, chief- 

 ly of the venous 

 type. These inter- 

 communicate very 

 freely, and when 

 filled with blood 

 cause the organ to 

 assume the peculiar 

 condition known as 



erection. The penis and the clitoris are supplied with caver- 

 nous bodies. The urethra of the female and the vestibule also 

 contain them. Interlacing bundles of muscle-fibres, together 

 with similar bands of connective tissue, form a framework for 

 the support of the vascular structures mentioned. The latter 

 present the ordinary endothelial lining. 



Several years ago Dr.H. J. Bigelow succeeded in demon- 

 strating the existence of cavernous tissue in the nasal fossae. 

 In a letter to the author, Dr. Bigelow states that his point 

 was " the demonstration of an abundant and true cavernous 

 structure and erectile tissue on and about the turbinated bones, 

 occupying the place of what had been previously supposed to 

 be only venous sinuses, the loops of Kohlrausch. The new re- 

 sult obtained was due to a different mode of preparation. Kohl- 



p IG . 74. A, cellular vascular sheath, from the coccygeal plexus : 

 a, connective tissue with scattered cells f nd nuclei ; fc, round and 

 polygonal cells lying immediately upon the capillary wall, c ; B, a 

 capillary from the coccygeal plexus, with a vascular sheath very rich 

 in cells. References as in A. Eberth. 



