- Length : 1.5 m
- Parts : • Caecum
• Ascending colon
• Right Colic Flexure
• Transverse colon
• Left Colic Flexure
• Descending colon
• Sigmoid colon
• Rectum
• Anal canal
- Calibre: Wide, gradually narrows
- Movable parts: • Transverse colon
• Sigmoid colon
- Cardinal features:
- Taenia coli (three ribbon like bands):
• Taenia libera
• Taenia mesocolica
• Taenia omenatlis
- Sacculations
- Appendices epiploicae
Parts of Large intestine
- Caecum
Length: 6 cm
Diameter: 7.5 cm
Ileocaecal valve present
- Vermiform appendix
Length: 2-20 cm (average:9 cm)
Diameter: 5 mm
Base: fixed
Tip: movable
Lumen: narrow
Villi absent
Appendicular orifice present
Site for Appendicitis (Mc Burney’s point)
- Ascending colon
Length: 12.5 cm
- Transverse colon
Length: 50 cm
- Descending colon
Length: 25 cm
- Sigmoid colon
Length: 37.5 cm
Loop: ‘S’ shaped (sinous loop)
- Rectum
Length: 12 cm
Diameter: 4 cm
Three cardinal features(Taenia coli, Sacculations, Appendices epiploicae) absent
Supported by:
• Levator ani muscles
• Fascia of Waldeyer
• Lateral ligaments
• Rectovesical fascia of Denonvilliers
• Pelvic peritoneum and related Vascular pedicles
• Perineal body with its muscles
- Anal canal
Length: 3.8 cm
Diameter: 4 cm
Anal sphincters present
Three parts: • Upper part (15 mm)
• Middle part (15 mm)
• Lower part ( 8 mm)