Ascending Colon Flashcards

Trace the ascending colon from the cecum to the hepatic flexure, examining its peritoneal relations, vascular supply, and innervation.

Card 1 of 26Question

What is the ascending colon?

The portion of the large intestine extending superiorly from the cecum to the right colic flexure.

In This Section

1. What is the ascending colon?

The portion of the large intestine extending superiorly from the cecum to the right colic flexure.

2. In which region of the abdomen is the ascending colon located?

The right side of the abdomen, extending from the right iliac fossa toward the right hypochondrium.

3. What is the approximate length of the adult ascending colon?

About 15 cm, although its length varies between individuals.

4. Which structure marks the inferior beginning of the ascending colon?

The cecum.

5. Which anatomical flexure marks the superior end of the ascending colon?

The right colic flexure, also called the hepatic flexure.

6. Which segment of the large intestine follows the ascending colon?

The transverse colon.

7. How is the ascending colon usually classified in relation to the peritoneum?

It is secondarily retroperitoneal, with peritoneum covering its anterior and lateral surfaces.

8. What is the fusion fascia behind the ascending colon called?

The right fusion fascia of Toldt.

9. Which posterior abdominal wall muscles lie behind the ascending colon?

The iliacus and quadratus lumborum muscles, with variable relationships to psoas major.

10. Which retroperitoneal urinary structure lies posterior to the ascending colon?

The right ureter.

11. Which abdominal organ lies superior to the right colic flexure?

The liver, particularly its right lobe.

12. What is the right paracolic gutter?

A peritoneal recess lateral to the ascending colon that permits movement of intraperitoneal fluid.

13. Which three characteristic external features are present on the ascending colon?

Taeniae coli, haustra, and epiploic appendages.

14. What are the taeniae coli of the ascending colon?

Three longitudinal bands of smooth muscle formed by thickening of the outer muscular layer.

15. Which embryological division of the gastrointestinal tract gives rise to the ascending colon?

The midgut.

16. Which major artery supplies the ascending colon?

The superior mesenteric artery through its ileocolic and right colic branches.

17. Which arterial branch commonly supplies the inferior portion of the ascending colon?

The colic branch of the ileocolic artery.

18. Which artery commonly supplies the middle and superior portions of the ascending colon?

The right colic artery, which is anatomically variable and may arise from the middle colic or ileocolic artery.

19. Which arterial arcade provides collateral circulation along the ascending colon?

The marginal artery of the colon, formed by anastomoses between colic arterial branches.

20. Through which veins does blood from the ascending colon reach the hepatic portal circulation?

The ileocolic and right colic veins drain into the superior mesenteric vein.

21. Which lymph nodes receive lymph from the ascending colon?

Epicolic and paracolic nodes, followed by intermediate ileocolic and right colic nodes and superior mesenteric nodes.

22. Which autonomic plexus provides sympathetic innervation to the ascending colon?

The superior mesenteric plexus.

23. Which cranial nerve provides parasympathetic innervation to the ascending colon?

The vagus nerve (cranial nerve X).

24. What is the principal physiological function of the ascending colon?

Absorption of water and electrolytes while moving and processing intestinal contents.

25. What is the usual histological appearance of the ascending colonic mucosa?

Straight intestinal crypts with abundant goblet cells and no villi.

26. Why is the ascending colon relevant during a right hemicolectomy?

Its vascular pedicles and retroperitoneal relations must be identified to protect adjacent structures.