Gerdes B, Köhler H H, Stinner B, Barth P J, Celik I, Rothmund M
Klinik für Allgemeinchirurgie, Philipps-Universität Marburg.
Chirurg. 1997 Dec;68(12):1281-5. doi: 10.1007/s001040050360.
The longitudinal muscle (LM) represents a strong muscular structure of the anal canal situated between the internal (IAS) and the external anal sphincter (EAS). Terminal fibres of this muscle insert at the submucosa of the anal canal, representing the m. canalis ani. Others cross the subcutaneous part of the EAS to become the m. corrugator ani. Thus, the LM connects the visceral and somatic parts of the anal sphincter complex. Histologically ganglionic cells and as Vater-Pacinian corpuscles can be identified inside the LM. Morphology, topography and histology of the LM suggest that this muscle participates in maintaining anorectal continence. It is mandatory that the exact functions of this muscular structure be to elaborated upon, if we are to understand the mechanism of anorectal continence.
纵肌（LM）是肛管的一种强大肌肉结构，位于肛门内括约肌（IAS）和肛门外括约肌（EAS）之间。该肌肉的终末纤维插入肛管黏膜下层，即肛管肌。其他纤维穿过EAS的皮下部分成为肛门皱襞肌。因此，纵肌连接了肛门括约肌复合体的内脏部分和躯体部分。组织学上，纵肌内可识别出神经节细胞和环层小体。纵肌的形态、位置和组织学表明，该肌肉参与维持肛门直肠节制。如果我们要理解肛门直肠节制的机制，就必须详细阐述这种肌肉结构的确切功能。
