Embryo hindgut

Question 1

derivatives of hindgut

Answer 1

left TC, DC, sigmoid colon, rectum, superior part of anus, epithelial lining of bladder, most of urethra

Question 2

blood supply to hindgut

Answer 2

IMA

Question 3

Cloacal membrane divided by

Answer 3

urorectal septum

Question 4

mesoderm derivatives of proctodeum

Answer 4

perineal body
pelvic floor m.
anal sphincter

Question 5

anal membrane closed until…

Answer 5

cells undergo apoptosis ~ week 8

Question 6

2 germ layers of anal canal

Answer 6

upper 2/3- part of hindgut- endoderm

lower 1/3 from proctodeum- ectoderm

Question 7

junction of the 2 different germ layers of anal canal meet at the

Answer 7

pectinate line- where membrane was before apoptosis

Question 8

white line indicates what?

Answer 8

histological change from columnar to cuboidal

Question 9

blood supply to upper 2/3 (hindgut) anal canal

Answer 9

superior rectal of IMA

Question 10

blood supply to lower 1/3 of anal canal

Answer 10

inf rectal from iliac a

Question 11

lymph drainage of upper 2/3

Answer 11

inf mesenteric lymph node

Question 12

lymph drainage of lower 1/3

Answer 12

superficial inguinal lymph node

Question 13

innervation to upper 2/3

Answer 13

ANS- symp (T11- L1), parasymp (S2-S4)

involuntary

Question 14

innervation to lower 1/3

Answer 14

inf rectal n
pudendal n (S2-4)

voluntary

Question 15

germ layer of upper 2/3

Answer 15

endoderm

Question 16

germ layer of lower 1/3

Answer 16

ectoderm

Question 17

symp innervation before splenic/left colic flexure

Answer 17

T11-L1

Question 18

symp innervation from left colic to rectum

Answer 18

L1-L2

Question 19

parasymp innervation before splenic flexure

Answer 19

vagus

Question 20

parasymp innervation after splenic flexure

Answer 20

S2-S4