The anal canal and rectum

Their varying relationship and its effect on anal continence


The effect of flexion of the hip joints on the anorectal angle has been discussed. It is concluded that the anorectal angle straightens out as the hip joints are flexed, while the anal canal is drawn open at the same time. This straightening effect, which is further increased by straining, results in lessening the resistance at the anorectal junction and increased ease of defecation. The hips-flexed position during defecation is recommended as part of the treatment of constipation and as a prophylaxis against hemorrhoids.

This is a preview of subscription content, access via your institution.


  1. 1.

    Jackson, C. C. and E. Robertson: Etiologic aspects of hemorrhoidal disease. Dis. Colon & Rectum.8: 185, 1965.

    Article  CAS  Google Scholar 

  2. 2.

    Parks, A. G., N. H. Porter and J. Melzak: Experimental study of the reflex mechanism controlling the muscles of the pelvic floor. Dis. Colon & Rectum.5: 407, 1962.

    Article  CAS  Google Scholar 

  3. 3.

    Phillips, S. F. and D. A. W. Edwards: Some aspects of anal continence and defecation. GUT.6: 396, 1965.

    PubMed  CAS  Google Scholar 

Download references

Author information



About this article

Cite this article

Tagart, R.E.B. The anal canal and rectum. Dis Colon Rectum 9, 449–452 (1966).

Download citation


  • Anal Canal
  • Hemorrhoid
  • Deflection Angle
  • Erect Position
  • Anorectal Angle