Ghoshal N G, Bal H S
Acta Anat (Basel). 1976;94(4):567-73.
The urethral process of the goat was an extension of the pars spongiosa of the male urethra. The erectile (cavernous) tissue of the urethral process was a continuation of the corpus spongiosum penis. The epithelium lining the urethra was stratified transitional. Two compact fibrocartilaginous strands were embedded in the erectile tissue, which were absent towards the tip of the urethral process. Smooth muscle was absent in the tunica mucosa-submucosa of the urethral process. The tunica mucosa-submucosa was richly supplied with blood vessels and nerves and it may be assumed that the urethral process is a sensory structure. Large cavernous sinuses, within the erectile tissue, were lined by endothelial cells. There was a circular fibroelastic layer enclosing the entire corpus spongiosum penis to withstand expansion of the erectile tissue during erection and copulation. The surface epithelium lining the urethral process was stratified squamous. A few connective tissue papillae were observed evaginating into the surface epithelium.
山羊的尿道突是雄性尿道海绵体部的延伸。尿道突的勃起（海绵体）组织是阴茎海绵体的延续。尿道内衬的上皮为复层移行上皮。两条紧密的纤维软骨束嵌入勃起组织中，在尿道突尖端处则没有。尿道突的黏膜下层无平滑肌。黏膜下层有丰富的血管和神经供应，因此可以认为尿道突是一个感觉结构。勃起组织内的大海绵窦由内皮细胞衬里。有一层环形纤维弹性层包裹着整个阴茎海绵体，以承受勃起和交配时勃起组织的扩张。尿道突表面的上皮为复层鳞状上皮。观察到一些结缔组织乳头向表面上皮内突出。
