5.2 Embryonic development of the BLADDER

Question 1

the majority of the BLADDER develops from which part of the UROGENITAL SINUS

Answer 1

VESICAL PART

Question 2

the TRIGONE of the BLADDER develops from the..

Answer 2

CAUDAL ENDS of the MESONEPHRIC DUCTS

Question 3

what is the CLOACA

Answer 3

‘sewer’

COMMON EXIT of the UROGENITAL and GASTROINTESTINAL TRACTS in the EMBRYO

Question 4

in HUMAN EMBRYO the CLOACA DIVIDES ventrally and dorsally:

Answer 4

Ventrally: UROGENITAL SINUS - exit for urinary and genital systems
form bladder and urethra at from

Dorsally: ANORECTAL CANAL - exit for gastrointestinal system
form rectum and anus at back

Question 5

how do we get SEPARATION of the CLOACA into urogenital and gastrointestinal

Answer 5

URORECTAL SEPTUM (mesenchyme) GROWS DOWN INTO CLOACA to separate

also from Lateral FOLDING Inwards

Question 6

when can we see complete SEPARATION between the UROGENITAL and ANAL TRACTS

Answer 6

around WEEK 12

Question 7

by week 12
the ALLANTOIS loses its lumen and DISINTEGRATES. Persists as the..

Answer 7

URACHAL CORD / URACHUS

(fibrous band)

Question 8

what do the MESONEPHRIC DUCTS CONNECT to

Answer 8

CLOACA

for outflow from primitive kidney

Question 9

what also forms/branches from mesonephric ducts

Answer 9

URETERIC BUD

Question 10

how is the TRIGONE of the BLADDER formed

Answer 10

part of MESONEPHRIC DUCTS attached to CLOACA WIDEN
2 come together to MEET in MIDLINE

• form TRIGONE (base of bladder)

Question 11

where do URETERS (upon development from URETERIC BUD) insert into TRIGONE

Answer 11

top of TRIGONE, on each side

Question 12

CONNECTION of the YOLK SAC to the CLOACA

Answer 12

ALLANTOIS