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Clinical Anatomy of the
Large Intestine
Handout download:
http://www.oucom.ohiou.edu/dbms-witmer/gs-rpac.htm
23 January 2007
Lawrence M. Witmer, PhD
Professor of Anatomy
Department of Biomedical Sciences
College of Osteopathic Medicine
Ohio University
Athens, Ohio 45701 witmerL@ohio.edu
free (anterior)
taenia
omental taenia
ileum mesenteric
taenia
right colic
(hepatic)
flexure
left colic
(splenic)
flexure
epiploic
appendages
appendix
cecum
ascending
colon
transverse haustra
colon
descending
colon
sigmoid
colon
rectum
Moore & Dalley 2005
Anatomical
Overview
Skandalakis’ Surgical Anatomy 2004
free taenia
omental taenia
mesenteric
taenia
epiploic
appendage
epiploic
appendage
mesentery
marginal a.
short
branch
long branch
Anatomical
Overview
www.bondisalud.com.ar/
1a%20diverticulosis.jpg
http://www.pathology.pitt.edu/lectures/gi/colon-b/06.jpg
Diverticulosis
diverticula
(internal view)
mucosal
herniation
Moore & Dalley 2005
diverticula
(external view)
Skandalakis’ Surgical Anatomy 2004
mucosa
normal
epiploic
appendage
taenia (longitudinal muscularis)
fat
serosa
circular
muscularis
vasa rectus
& branches
Diverticulosis
antimesenteric anastomosis
injury to
vasa rectus
branch
distal ischemia
diverticulum into
epiploic appendage
Dimensions
cecum
5 cm
ascending
colon
10 cm
transverse colon
50 cm
descending
colon
10 cm
sigmoid colon
50 cm
anal canal
4 cm
rectum
15 cm
5 cm
6
cm
8
cm
5
cm
5
cm
4 cm
widest:
likely
site for
perforation
narrowest: likely
site for obstruction
mesentery
of small
intestine
sigmoid
mesocolon
greater
omentum
transverse
mesocolon
Paraduodenal fossae:
1) Superior & 2) Inferior
fossae of Trietz
3)Mesentericoparietal
fossa of Waldeyer
4)Intermesocolic fossa
of Brooke
5)Paraduodenal fossa
of Landzert
Skandalakis’ Surgical Anatomy 2004
• Mobility
• Vascularization
• Compartments
• Volvulus
IMV
• Internal hernias
• many more
Peritoneal Relations
Paraduodenal fossae:
1) Superior & 2) Inferior
fossae of Trietz
3)Mesentericoparietal
fossa of Waldeyer
4)Intermesocolic fossa
of Brooke
5)Paraduodenal fossa
of Landzert
Skandalakis’ Surgical Anatomy 2004
SMA
Internal Hernia
Right
Paraduodenal
Hernia
hernial
sac
Peritoneal Relations
free taenia
cecum
Skandalakis’ Surgical Anatomy 2004
appendix
mesoappendix
superior ileocecal
internal hernia
(a pericecal hernia;
6-13% of all internal hernias)
Peritoneal Relations
superior &
inferior
ileocecal
fossa
Position
Nonapp-
endicitis
1
Appen
dicitis
5
Total %
A Preileal 6 4
G
E
C
D
B
A
anterior
B Postileal 7 3 10 8 F
C Subileal 11 8 19 15
D Pelvic 14 11 25 19
E Subcecal 9 5 14 11
F Paracecal 4 9 13 10
G Retrocecal 18 24 42 33
post.
Appendix
Position
Skandalakis’ Surgical Anatomy 2004
data from O’Connor & Reed (1994)
Peritoneal Relations
Moore’s Developing Human 1988
• Elongation of gut tube
• Herniation into umbilical cord
• Counterclockwise rotations
Peritoneal Relations
Moore’s Developing Human 1988
• Retraction & return of gut
• Final counterclockwise rotation
• Descent of cecum
• Fixation to posterior abdominal wall
Peritoneal Relations
Peritoneal Relations
Skandalakis’ Surgical Anatomy 2004
peritoneum
cecum
appendix
ileum
peritoneum
retroperitoneal
tissue
paracolic groove
para-
colic
gutter
mesentery
normal
unfixed,
mobile
Peritoneal Relations
Skandalakis’ Surgical Anatomy 2004
Fixation of cecum
asc col
mesent
ileum
cecum
pelvic brim
Type I 11.2% Ia 8.3% Type Ib 22.7%
appendix
Type II 9.7% IIa 7.3% III 11.3% III 5.7%
areas of fixation shown in black
Type IV 17.3% V 4.7% VI 2.7%
stomach aorta
umbilicus
cecum
celiac trunk (foregut)
superior mesenteric A.
(midgut)
inferior mesenteric A.
(hindgut)
Vasculature
Skandalakis’ Surgical Anatomy 2004
Skandalakis’ Surgical Anatomy 2004
m. colic a.
r. colic a.
marginal a.
ileocolic a.
cecal a.
appendicular
a.
ileal a.
SMA IMA
sup. rectal a.
RCA-Ileocolic
anastomosis
absent 5%
Vasculature
Anastomosis
• poor 32%
• absent 7%
acc. left colic
a. (~ 40%)
marginal a.
l. colic a.
sigmoid aa.
Vasculature
Skandalakis’ Surgical Anatomy 2004
occluded SMA
meandering
mesenteric a.
(arc of Riolan)
dilated
marginal a.
MCA
RCA
ileocolic a.
Gourley & Gering 2005
Skandalakis’ Surgical Anatomy 2004
Nodes N
A Ileocolic 29
B Right colic 11.1
C Midcolic 22.4
D Left colic 25.2
E Sigmoid &
rectal
32.8
Lymphatic Drainage
mesenteric nodes
l. lumbar
mesocolic
paracolic
epicolic
nodes
B
A
C
D
E
Lymphatic Drainage
lesion
Arterial & lymphatic territory
associated with a lesion
Skandalakis’ Surgical Anatomy 2004
References
• Gourley, E. J. and S. A. Gering. 2005. The meandering mesenteric
artery: a historical review and surgical implications. Diseases of the
Colon and Rectum 48(5):996-1000.
• Mathieu, D. and A. Luciani. 2004. Internal abdominal herniations.
American Journal of Roentgenology 183:397-404.
• Moore, K. L. 1988. The Developing Human. Clinically Oriented
Embryology, 4th Ed. Lippincott, Williams & Wilkins, Baltimore.
• Moore, K. L. and A. F. Dalley. 2006. Clinically Oriented Anatomy,
5th Ed. Lippincott, Williams & Wilkins, Baltimore.
• O'Connor, C. E. and W. P. Reed 1994. In vivo location of the human
vermiform appendix. Clinical Anatomy 7:139-142.
• Skandalakis, J. E., G. L. Colborn, T. A. Weidman, R. S. Foster, A.
N. Kingsnorth, L. J. Skandalakis, N. P. Skandalakis, P. Mirilas
(Editors). 2004. Surgical Anatomy: The Embryologic And Anatomic
Basis Of Modern Surgery. McGraw-Hill, New York.

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document.pptx

  • 1. Clinical Anatomy of the Large Intestine Handout download: http://www.oucom.ohiou.edu/dbms-witmer/gs-rpac.htm 23 January 2007 Lawrence M. Witmer, PhD Professor of Anatomy Department of Biomedical Sciences College of Osteopathic Medicine Ohio University Athens, Ohio 45701 witmerL@ohio.edu
  • 2. free (anterior) taenia omental taenia ileum mesenteric taenia right colic (hepatic) flexure left colic (splenic) flexure epiploic appendages appendix cecum ascending colon transverse haustra colon descending colon sigmoid colon rectum Moore & Dalley 2005 Anatomical Overview
  • 3. Skandalakis’ Surgical Anatomy 2004 free taenia omental taenia mesenteric taenia epiploic appendage epiploic appendage mesentery marginal a. short branch long branch Anatomical Overview
  • 5. Skandalakis’ Surgical Anatomy 2004 mucosa normal epiploic appendage taenia (longitudinal muscularis) fat serosa circular muscularis vasa rectus & branches Diverticulosis antimesenteric anastomosis injury to vasa rectus branch distal ischemia diverticulum into epiploic appendage
  • 6. Dimensions cecum 5 cm ascending colon 10 cm transverse colon 50 cm descending colon 10 cm sigmoid colon 50 cm anal canal 4 cm rectum 15 cm 5 cm 6 cm 8 cm 5 cm 5 cm 4 cm widest: likely site for perforation narrowest: likely site for obstruction
  • 7. mesentery of small intestine sigmoid mesocolon greater omentum transverse mesocolon Paraduodenal fossae: 1) Superior & 2) Inferior fossae of Trietz 3)Mesentericoparietal fossa of Waldeyer 4)Intermesocolic fossa of Brooke 5)Paraduodenal fossa of Landzert Skandalakis’ Surgical Anatomy 2004 • Mobility • Vascularization • Compartments • Volvulus IMV • Internal hernias • many more Peritoneal Relations
  • 8. Paraduodenal fossae: 1) Superior & 2) Inferior fossae of Trietz 3)Mesentericoparietal fossa of Waldeyer 4)Intermesocolic fossa of Brooke 5)Paraduodenal fossa of Landzert Skandalakis’ Surgical Anatomy 2004 SMA Internal Hernia Right Paraduodenal Hernia hernial sac Peritoneal Relations
  • 9. free taenia cecum Skandalakis’ Surgical Anatomy 2004 appendix mesoappendix superior ileocecal internal hernia (a pericecal hernia; 6-13% of all internal hernias) Peritoneal Relations superior & inferior ileocecal fossa
  • 10. Position Nonapp- endicitis 1 Appen dicitis 5 Total % A Preileal 6 4 G E C D B A anterior B Postileal 7 3 10 8 F C Subileal 11 8 19 15 D Pelvic 14 11 25 19 E Subcecal 9 5 14 11 F Paracecal 4 9 13 10 G Retrocecal 18 24 42 33 post. Appendix Position Skandalakis’ Surgical Anatomy 2004 data from O’Connor & Reed (1994) Peritoneal Relations
  • 11. Moore’s Developing Human 1988 • Elongation of gut tube • Herniation into umbilical cord • Counterclockwise rotations Peritoneal Relations
  • 12. Moore’s Developing Human 1988 • Retraction & return of gut • Final counterclockwise rotation • Descent of cecum • Fixation to posterior abdominal wall Peritoneal Relations
  • 13. Peritoneal Relations Skandalakis’ Surgical Anatomy 2004 peritoneum cecum appendix ileum peritoneum retroperitoneal tissue paracolic groove para- colic gutter mesentery normal unfixed, mobile
  • 14. Peritoneal Relations Skandalakis’ Surgical Anatomy 2004 Fixation of cecum asc col mesent ileum cecum pelvic brim Type I 11.2% Ia 8.3% Type Ib 22.7% appendix Type II 9.7% IIa 7.3% III 11.3% III 5.7% areas of fixation shown in black Type IV 17.3% V 4.7% VI 2.7%
  • 15. stomach aorta umbilicus cecum celiac trunk (foregut) superior mesenteric A. (midgut) inferior mesenteric A. (hindgut) Vasculature Skandalakis’ Surgical Anatomy 2004
  • 16. Skandalakis’ Surgical Anatomy 2004 m. colic a. r. colic a. marginal a. ileocolic a. cecal a. appendicular a. ileal a. SMA IMA sup. rectal a. RCA-Ileocolic anastomosis absent 5% Vasculature Anastomosis • poor 32% • absent 7% acc. left colic a. (~ 40%) marginal a. l. colic a. sigmoid aa.
  • 17. Vasculature Skandalakis’ Surgical Anatomy 2004 occluded SMA meandering mesenteric a. (arc of Riolan) dilated marginal a. MCA RCA ileocolic a. Gourley & Gering 2005
  • 18. Skandalakis’ Surgical Anatomy 2004 Nodes N A Ileocolic 29 B Right colic 11.1 C Midcolic 22.4 D Left colic 25.2 E Sigmoid & rectal 32.8 Lymphatic Drainage mesenteric nodes l. lumbar mesocolic paracolic epicolic nodes B A C D E
  • 19. Lymphatic Drainage lesion Arterial & lymphatic territory associated with a lesion Skandalakis’ Surgical Anatomy 2004
  • 20. References • Gourley, E. J. and S. A. Gering. 2005. The meandering mesenteric artery: a historical review and surgical implications. Diseases of the Colon and Rectum 48(5):996-1000. • Mathieu, D. and A. Luciani. 2004. Internal abdominal herniations. American Journal of Roentgenology 183:397-404. • Moore, K. L. 1988. The Developing Human. Clinically Oriented Embryology, 4th Ed. Lippincott, Williams & Wilkins, Baltimore. • Moore, K. L. and A. F. Dalley. 2006. Clinically Oriented Anatomy, 5th Ed. Lippincott, Williams & Wilkins, Baltimore. • O'Connor, C. E. and W. P. Reed 1994. In vivo location of the human vermiform appendix. Clinical Anatomy 7:139-142. • Skandalakis, J. E., G. L. Colborn, T. A. Weidman, R. S. Foster, A. N. Kingsnorth, L. J. Skandalakis, N. P. Skandalakis, P. Mirilas (Editors). 2004. Surgical Anatomy: The Embryologic And Anatomic Basis Of Modern Surgery. McGraw-Hill, New York.