Rectum and Anus

Question 1

5 inches long

begins in front of 3rd sacral vertebra passes downward ends in front of the TIP of the COCCYX

RECTAL AMPULLA

MAIN PELVIC CAVITY

VALVES OF HOUSTON

Answer 1

RECTUM

Question 2

Blood supply of the SUPERIOR RECTAL

Answer 2

IMA – superior rectal a

superior rectal – IMV – portal vein

inferior mesenteric LN

Question 3

Blood supply of the MIDDLE RECTAL

Answer 3

INTERNAL ILIAC – middle rectal a

internal iliac – middle rectal vein

internal iliac LN

Question 4

Blood supply of the LOWER RECTAL

Answer 4

INTERNAL PUDENDAL – inferior rectal

inferior rectal – internal pudendal

internal iliac LN

Question 5

Located in PERINEUM

1 and 1/4 inches (4 cm)

Begins at the level of PUBORECTALIS

sensitive to pain, temperature, touch and pressure

PECTINATE/ANORECTAL/DENTATE LINE

ANAL COLUMNS OF MORGAGNI

Answer 5

ANAL CANAL

Question 6

Indicates the junction b/w the superior and inferior part

Separates the canal into 2 segments each w/ different embryonic origin, blood supply and innervations

Answer 6

PECTINATE/ANORECTAL/DENTATE LINE

Question 7

from HINDGUT ENDODERM

(+) ANAL COLUMNS

sensitive to STRECTH

supplied and drained by SUPERIOR RECTAL

inferior mesenteric nodes

Answer 7

UPPER PART OF THE ANAL CANAL

Question 8

from ECTODERM

(-) anal columns

sensitive to PAIN, TEMP, TOUCH, PRESSURE

supplied and drained by INFERIOR RECTAL

superficial inguinal LN

Answer 8

LOWER PART OF THE ANAL CANAL

Question 9

3 hemorrhoidal cushions

Answer 9

left lateral
right anterior
right posterior

Question 10

BLOOD SUPPLY GIT

Answer 10

ENDODERM

foregut - CELIAC
*liver, esophagus, stomach, pancreas, 1st part of duodenum

midgut - SUPERIOR MESENTERIC ARTERY
*2nd part of duodenum, jejunum, ileum, transverse colon (1/2), ascending colon, cecum, appendix

hindgut - INFERIOR MESENTERIC ARTERY
*transverse colon (distal half), descending colon, sigmoid colon, rectum