Musculus Sphincter Ani Externus (Noun)
Meaning
An external ring of striated muscle surrounding the anus.
Classification
Nouns denoting body parts.
Examples
- The musculus sphincter ani externus is a ring-like muscle that surrounds the anus and plays a crucial role in maintaining continence.
- During childbirth, the musculus sphincter ani externus can become stretched or torn, leading to potential complications.
- The musculus sphincter ani externus is innervated by the inferior rectal nerve, which provides motor control to the muscle.
- In cases of fecal incontinence, the musculus sphincter ani externus may be weakened or damaged, requiring surgical intervention.
- Anatomical studies have shown that the musculus sphincter ani externus is composed of fast-twitch muscle fibers, allowing for rapid contraction and relaxation.