INNERVATION OF FELINE PERINEAL MUSCULATURE
INNERVATION OF FELINE PERINEAL MUSCULATURE
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DOI：
10.1002/ar.1091800104
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发表时间：
1974-01-01
影响因子：
--
通讯作者：
BRADLEY, WE
中科院分区：
文献类型：
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作者：
MARTIN, WD;FLETCHER, TF;BRADLEY, WE
通过大体解剖骶神经丛和定量来自神经丛的选定神经中的传出和传入有髓纤维来检查猫会阴部肌肉的神经支配。此外，肌纤维的大小和肌梭含量的分布进行了测定所研究的神经支配的肌肉，传出有髓纤维的群体是双峰的神经支配的肌肉与许多梭和单峰的神经支配的肌肉中，很少或没有观察到的梭。尾骨肌和提肛肌的肌梭数目相似，但在传入神经支配的基础上，两者的肌梭数目不同。在尾骨肌和肛门外括约肌中，初级梭形末梢必须与相对较小的传入神经纤维相关。骨盆尿道比阴茎接受更多的大的有髓传入纤维。肛门外括约肌的三个分支有三种不同的肌纤维群，基于大小分布。同源的球海绵体肌和外阴缩窄肌具有不同的肌纤维群。
Innervation to muscles of the feline perineum was examined by gross dissection of the sacral nerve plexus and quantitation of efferent and afferent myelinated fibers in selected nerves derived from the plexus. In addition, distribution of muscle fiber sizes and muscle spindle content were determined for muscles innervated by the nerves studied.Efferent myelinated fiber populations were bimodal in nerves innervating muscles with many spindles and unimodal in nerves innervating muscles in which few or no spindles were observed. Coccygeus and levator ani muscles had similar numbers of muscle spindles, but the spindles were different in the two muscles based on afferent innervation. In both coccygeous and external anal sphincter muscles, primary spindle endings must be associated with relatively small afferent nerve fibers. The pelvic urethra received more large myelinated afferent fibers than the penis. The three divisions of the external anal sphincter muscle had three distinct populations of muscle fibers, based on size distribution. The homologous bulbospongiosus and constrictor vulvae muscles had different populations of muscle fibers.