Dail W G, Sachs B D
Department of Anatomy, University of New Mexico School of Medicine, Albuquerque 87131.
Anat Rec. 1991 Feb;229(2):203-8. doi: 10.1002/ar.1092290207.
The ischiourethralis (IU), a striated perineal muscle presumed to be involved in sexual reflexes, was studied in the rat. The paired muscle arises from the penile crus and the penile bulb and unites in a raphe over the deep dorsal vein of the penis. Retrograde tracing studies show that the muscle is innervated by neurons in the dorsolateral nucleus of the lumbar spinal cord, a pudendal nerve motor nucleus which also innervates the ischiocavernosus muscle. Excision of the IU muscle did not interfere with the ability of males to display normal copulatory behavior, nor did it affect significantly the number and intensity of reflexive erections. It nevertheless remains possible that the IU may contribute to intense glans erection by compressing the deep dorsal vein.
坐骨尿道肌（IU）是一种被认为参与性反射的会阴横纹肌，在大鼠身上进行了研究。成对的肌肉起自阴茎脚和阴茎球，在阴茎深背静脉上方的缝中合并。逆行追踪研究表明，该肌肉由腰脊髓背外侧核中的神经元支配，阴部神经运动核也支配坐骨海绵体肌。切除IU肌肉并不影响雄性大鼠表现正常交配行为的能力，也没有显著影响反射性勃起的次数和强度。然而，IU仍有可能通过压迫深背静脉来促进龟头的强烈勃起。
