Sachs B D
J Reprod Fertil. 1982 Nov;66(2):433-43. doi: 10.1530/jrf.0.0660433.
In 4 experiments, various striated penile muscles of the rat were excised. Without the ischiocavernosus (IC) muscles no dorsiflexions ('flips') of the glans penis occurred during ex copula reflex tests, but erections were unaffected. In attempted copulation, males lacking the IC muscles rarely gained intromission, apparently because dorsiflexion of the glans penis is necessary for penetration of the vagina. Nonetheless some males lacking the IC muscles displayed the gross motor pattern of intromission and ejaculated, but rarely within the vagina. Males lacking the bulbocavernosus (BC) and levator ani (LA) muscles were incapable of developing intense erections ('cups') in ex copula tests, but they did have lesser erections, probably due to vascular action. Males with excised BC and LA muscles displayed normal copulatory behaviour, including intromission and intravaginal ejaculation, but only 1/15 females mated to these males became pregnant. The infertility of the males was attributed in part to their inability to form the penile cup, which caused them to withdraw a larger portion of the seminal plug from the vagina and, presumably, prevented the plug from being tightly lodged against the cervix. In male rats copulation apparently requires co-ordination of the penile vasculature with the contraction of separate groups of striated penile muscles, each having a distinct contribution to the integrated pattern of copulation and, ultimately, to the male's fertility.
在4项实验中，切除了大鼠的各种阴茎横纹肌。在交媾后反射测试中，没有坐骨海绵体（IC）肌时，阴茎头不会出现背屈（“翻动”），但勃起不受影响。在尝试交配时，缺乏IC肌的雄性很少能插入，显然是因为阴茎头的背屈是插入阴道所必需的。尽管如此，一些缺乏IC肌的雄性仍表现出插入的总体运动模式并射精，但很少在阴道内射精。缺乏球海绵体（BC）肌和提肛肌（LA）的雄性在交媾后测试中无法产生强烈的勃起（“杯状”），但它们确实有较弱的勃起，可能是由于血管作用。切除了BC肌和LA肌的雄性表现出正常的交配行为，包括插入和阴道内射精，但与这些雄性交配的雌性中只有1/15怀孕。雄性的不育部分归因于它们无法形成阴茎杯状勃起，这导致它们从阴道中抽出较大一部分精液栓，并且据推测，阻止了精液栓紧密地嵌在子宫颈上。在雄性大鼠中，交配显然需要阴茎血管系统与不同组阴茎横纹肌的收缩相协调，每组肌肉对交配的整体模式都有独特的贡献，最终对雄性的生育能力也有贡献。
