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17 The lower gastrointestinal tract

Teniae coli

Appendices
epiploicae Retro-ileal
Pre-ileal
Retrocolic
Retrocaecal
Subcaecal

Pelvic
Ovary in female

Fig.17.1
The various positions in which the appendix may be found.
In the pelvic position the appendix may be close to the ovary in the female

Longitudinal muscle
Circular muscle Rectum
Levator ani

Obturator internus
Fat of ischiorectal fossa

Sphincter Deep Submucosa
ani Superficial Sphincter ani internus
externus Subcutaneous

Pudendal canal
Adductor muscles

Inferior rectal
vesels and nerve
Fig.17.2
A coronal section through the pelvis to show the
anal sphincters and the ischiorectal fossa

42 Abdomen and pelvis