Martinez-Pereira M A, Rickes E M
Neuroscience Post-graduate Program and Comparative Neurobiology Laboratory, Physiology Department, Health Basic Science Institute, Federal University of Rio Grande do Sul, Rua Sarmento Leite, 500, Porto Alegre, RS, Brazil 90046-900.
J S Afr Vet Assoc. 2011 Sep;82(3):150-4. doi: 10.4102/jsava.v82i3.53.
In this study, the spinal nerves that constitute the lumbosacral plexus (plexus lumbosacrales) (LSP) and its distribution in Chinchilla lanigera were investigated. Ten chinchillas (6 males and 4 females) were used in this research. The spinal nerves that constitute the LSP were dissected and the distribution of pelvic limb nerves originating from the plexus was examined. The iliohypogastric nerve arose from L1 and L2, giving rise to the cranial and caudal nerves, and the ilioinguinal nerve arose from L3. The other branch of L3 gave rise to the genitofemoral nerve and 1 branch from L4 gave rise to the lateral cutaneous femoral nerve. The trunk formed by the union of L4-5 divided into medial (femoral nerve) and lateral branches (obturator nerve). It was found that the LSP was formed by all the ventral branches of L4 at L6 and S1 at S3. At the caudal part of the plexus, a thick branch, the ischiadic plexus, was formed by contributions from L5-6 and S1. This root gave rise to the nerve branches which were disseminated to the posterior limb (cranial and caudal gluteal nerves, caudal cutaneous femoral nerve and ischiadic nerve). The ischiadic nerve divided into the caudal cutaneous surae, lateral cutaneous surae, common fibular and tibial nerve. The pudendal nerve arose from S1-2 and the other branch of S2 and S3 formed the rectal caudal nerve. The results showed that the origins and distribution of spinal nerves that constitute the LSP of chinchillas were similar to those of a few rodents and other mammals.
在本研究中，对构成腰荐神经丛（plexus lumbosacrales）（LSP）的脊神经及其在毛丝鼠中的分布进行了研究。本研究使用了10只毛丝鼠（6只雄性和4只雌性）。解剖构成LSP的脊神经，并检查源自该神经丛的盆肢神经的分布。髂腹下神经起自L1和L2，发出颅侧和尾侧神经，髂腹股沟神经起自L3。L3的另一分支发出生殖股神经，L4的1个分支发出股外侧皮神经。由L4 - 5联合形成的干分为内侧支（股神经）和外侧支（闭孔神经）。发现LSP由L4的所有腹侧支在L6以及S1在S3处形成。在神经丛的尾部，由L5 - 6和S1的分支形成一条粗大的分支，即坐骨神经丛。该神经根发出神经分支，这些分支分布到后肢（臀前和臀后神经、股后皮神经和坐骨神经）。坐骨神经分为腓肠后皮神经、腓肠外侧皮神经、腓总神经和胫神经。阴部神经起自S1 - 2，S2和S3的另一分支形成直肠尾神经。结果表明，构成毛丝鼠LSP的脊神经的起源和分布与一些啮齿动物和其他哺乳动物的相似。
