Conjoint_longitudinal_muscle

Conjoint longitudinal muscle

Conjoint longitudinal muscle

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The conjoint longitudinal muscle is a muscle layer in the wall of the anal canal between the internal anal sphincter (deep to CLM) and external anal sphincter (superficial to CLM). It is continuous proximally with the longitudinal (outer) smooth muscle layer of the rectum. It receives autonomic innervation in common with the internal anal sphincter.[1]

Anatomy

Distally, the muscle detaches and extends in three directions. The projections of the muscle represent pathways for the spread of infections.[1]

Development

The CLM is especially prominent in the foetus, but is gradually replaced by connective tissue with age.[1]

Function

Contraction of the CLM shortens and widens the anal canal, and everts the anal orifice.[1]

References

  1. [1]
    Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York. p. 1201. ISBN 978-0-7020-7707-4. OCLC 1201341621.{{cite book}}: CS1 maint: location missing publisher (link)
  • Pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University) (Rectum)
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