DIG Organs 3

Question 1

Sigmoid colon end

Answer 1

S3 by becoming rectum

Question 2

Sigmoid colon blood supply

Answer 2

Arterial: lower left colic (inferior mesenteric artery)
Venous: lower left colic (inferior mesenteric vein)

Question 3

Rectum beginning and length

Answer 3

S3 sigmoid colon continuation
5 inches

Question 4

Anal canal beginning and length

Answer 4

1 inch below and in front of coccyx tip as rectum continuation
4 cm

Question 5

Rectum end

Answer 5

1 inch below and in front of coccyx tip becoming anal canal

Question 6

Anal canal end

Answer 6

Anus in perineum

Question 7

Rectum peritoneal covering

Answer 7

Upper 1/3 covered in front and sides
Middle 1/3 front only
Lower 1/3 bare

Question 8

Anal canal peritoneal covering

Answer 8

Bare of peritoneum

Question 9

Rectum peritoneal pouches related and anal sphincters

Answer 9

Rectovesical (male)
Rectoiterine (female)

Question 10

Anal canal peritoneal pouches related and anal sphincters

Answer 10

Internal anal sphincter (autonomic nerve)
External anal sphincter
Subcutaneous
Superficial and deep parts (inferior rectal and perineal of S4)

Question 11

Rectum relations anterior

Answer 11

Urinary bladder base
Seminal vesical
Vas ampulla (male)
Uterus and vagina (female)

Question 12

Rectum relations posterior

Answer 12

Sacrum and coccyx
Coccygeus and levator ani
Median and lateral sacral arteries
Sympathetic chain and sacral plexus

Question 13

Anal canal relations

Answer 13

Anterior:
Penis bulb (male)
Vagina (female)
Perineal body
Posterior:
Anococcygeal body

Question 14

Rectum blood supply arterial

Answer 14

Superior rectal (inferior mesenteric)
Middle rectal (internal iliac artery)
Inferior rectal (internal pudendal)

Question 15

Rectum blood supply venous

Answer 15

Superior rectal (splenic)
Middle and inferior rectal (internal iliac vein)

Question 16

Anal canal blood supply arterial

Answer 16

Superior rectal (inferior mesenteric)
Inferior rectal (interior pudendal)

Question 17

Anal canal blood supply venous

Answer 17

Superior rectal (splenic vein)
Inferior rectal (internal iliac vein)

Question 18

Rectum lymph drainage

Answer 18

Inferior mesenteric nodes (upper part)
Internal iliac nodes (lower part)

Question 19

Anal canal lymph drainage

Answer 19

Internal iliac nodes (upper part)
Superficial inguinal nodes (lower part)

Question 20

Rectum flexure and developmental origin

Answer 20

Anteroposterior (sacral and perineal)
Lateral (upper and middle and lower)

Question 21

Anal canal flexure and developmental origin

Answer 21

Upper 1.5 cm (endodermal)
Lower 2.5 cm (ectodermal)