Exam 1: Development of The Repro Tract

Question 1

In early embryo, from what layers do the organs of the reproductive tract develop

Answer 1

ectoderm: portions of vagina, vestibule, penis
mesoderm: gonads, uterus, cervix, portions of vagina, epididymis, ductus deferens

Question 2

what structures develop during the first trimester

Answer 2

1. migration of primordialse germ cells
2. sex cords and paramesonephric ducts develop
3. sex evident from structures
4. development of testes/ovaries

Question 3

what structures develop during the seconds trimester

Answer 3

4. development of testes/ovaries
5. formation of broad ligament
6. testicular development (bull & ram)

Question 4

what structures develop during the third trimester

Answer 4

6. testicular descent (boar, colt, human)

Question 5

Genital Ridges

Answer 5

Form the ovaries or testicles
The adjacent components of the ridges, which are initially concerned with the urinary system, swap roles and contribute ti the duct systems of the repro tracts
As development progresses, ridges shorten and lie caudal to the kidneys, then migrate to adult position

Question 6

Germinal Epithelium

Answer 6

Derives from mesoderm surrounding coelom

Question 7

Primary sex cords

Answer 7

Development may be induced by cells migrating from endoderm lining gut and yolk sac
Development of cords develops primitive duplicate male and female duct systems
Development of cords (and secondary sex characteristics) influenced by hormones produced by gonads

Question 8

Hermaphrodism

Answer 8

Individual has both male and female sex organs
Caused by errors in early stages of development

Question 9

Seminiferous tubules

Answer 9

Primary sex cords develop into seminiferous tubules in males
Where sperm is produced
Distributed throughout substance of adult testicle and not restricted to surface

Question 10

Rete testis

Answer 10

medullary regions of primary sex cords develop into rete testis
aka testicular network/plexus

Question 11

Efferent ducts

Answer 11

Rete drained by many efferent ducts which join to epididymal duct

Question 12

Epididymal duct

Answer 12

Where the efferent ducts dain
Site of sperm maturation
dains to deferent ducts

Question 13

Deferent duct

Answer 13

Aka vas deferens
Where epididymal duct drains
Drains to urethra

Question 14

Archinephric duct

Answer 14

Precursor of deferent duct
drains primitive first kidney (pronephros), then mesonephros
Use transferred from urinary to repro system during development
Turns into wolffian and mesonephric ducts?