Embryology Flashcards
Pronephros is what?
Cervical kidneys
Mesonephros is what?
Thoracocolumbar kidneys
Metanephros is what
Pelvic Kidneys
Primitive sex cords are formed from
Mesenchyme of genital ridges
What becomes paramesonephric duct
Epithelium of Mesonephros
Mesonephric duct also known as
Wollfian Duct
Paramesonephric duct also known as
Mullerian Duct
Mesonephric duct in males forms (3)
Epididymis
Vas Deferens
Seminal Vesicle
Urogenital Sinus forms (3)
Bladder
Urethra
Prostate
Lower Vagina
Paramesonephric duct forms (3)
Fallopian Tube
Uterus
Cervix part of Vagina
SRY codes for what
TDF in Males
What makes indifferent gonad develop into testis
TDF in Males
What forms leading cells
MIS transforms mesenchymal cells
What produces testosterone and thus male external genitals
Leydig Cells
SRY transforms
Sertoli cells
What makes paramesonephric duct degenerate
Sertoli cells secretes MIS
When is TDF secretes
Week 7
What week does Leydig Cells produce Testosterone
Week 8
Seminal Vesicles are an outgrowth of
Caudal end of mesonephric duct
Prostate is an outgrowth of
From urethra from urogenital sinus
In the presence of TDF gonad does what
develops into testis
What end of paramesonephric duct becomes ovary
Cranial
What end of paramesonephric duct becomes sup vagina and uterus
Caudal
Inferior part of vagina developed from
Urogenital Sinus
Gonads initially form where
Lumbar region
In week 7 where are testis and ovary
T10
When does broad ligament develop?
Week 12
Round ligament of ovary is drawn through inguinal canal to attach to
Labrum Majorum
In Week 12 what happens to testis
at level of deep inguinal ring until 7th month
When does testis enter scrotum?
39 Weeks
What is Cryptorchidism
Undescended Testes
Undescended testes can turn into what type of tumour
Germ Cell
Sperm can survive
5 Days
Oocyte can survive
24 Hours
First cell division happens when
Day 2
Morula formation when
Day 4
Blastocyst forms when
Day 5
The embryo hatches from
Zona Pellucida day 5 after fertilisation
Mature placenta is formed from (4)
Chorionic Villi
Intervillous Space
Placenta Septae
Cotyledons
Between what weeks does bilaminar disc and development of amniotic sac, yolk sac form
Week 2-3
When does differentiation of bilaminar disc happen
Week 3-4
When does organogenesis happen
Week 5-8
Mesoderm forms (4)
Ureters
Bladder Trigone
Gonads
Peritoneum
Endoderm forms (2)
Urethra
Bladder except Trigone
What is a twin pregnancy non identical called
Dizygotic
What is a identical twin pregnancy
Monozygotic
What is Monozygotic twin pregnancy separate placenta and amniotic sac called
Dichoronic Diamniotic
What is Monozygotic twin pregnancy Share placenta and separate amniotic called
Monochorionic Diamniotic
What is monozygotic twin pregnancy with share placenta and amniotic sac called
monochromic monoamniotic
What is the first 8 weeks of embryo development?
Embryogenesis
What forms kidney and ureter
Gonad and Nephrogenic Cord
Kidneys final position by
Week 12
Bladder and Urethra formed from
Urogenital Sinus
The cloaca is divided by urorectal septum to form
Urogenital sinus
Anal Canal
Urogenital sinus will form
Bladder and Urethra
Indifferent gonad develops in
Gonadal ridge
What chromosome contains SRY gene
Y chromosome
SRY produces
testis determining factor
Leydig cells are produced from
Intermediate Mesoderm
Sertoli cells are derived from
Surface epithelium under effect of AMH
the gonads develop where
posterior abdo wall
the testes reach deep inguinal ring by
7 months of pregnancy
bladder and urethra develops from
urogenital part of cloaca
Mesonepheric duct lower part forms
Trigone
Mesonephric ducts are also called
Wolffian Ducts
What drains mesonephros into cloaca
Wolffian Ducts
Mesonephric ducts forms what in males and females
Bladder
Urogenital sinus forms
Lower 1/3rd of Vagina
Paramesonephric duct forms
uterus and upper 2/3rd of vagina
What fuses posterior to anterior to form penile urethra (spongy urethra)
urogenital folds
What forms final part of urethra?
Glans Penis
What forms the labia major
labioscrotal folds
What forms the genital tubercle
clitoris