Embryology

Question 1

Where does the indifferent gonads develop ?

Answer 1

The urogenital ridge

Question 2

Components of indifferent gonads ?

Answer 2

1- primordial germ cells
2- primary sex cords
3- Wolffian and Mullerian ducts

Question 3

Where dose the primordial germ cels arise from ? When does it migrate ?

Answer 3

The lining cells in the wall of the yolk sack

At week 4

Question 4

Development pf the testis and male reproductive system is directed by ?

Answer 4

1- Sry gene on the short arm of chromosome Y which encodes for TDF
2- Testosterone
3- MIF
4- DHT

Question 5

Requirements for the ovarian development ?

Answer 5

1- absence of Sry gene

2- presence of WNT4 gene on chromosome 1

Question 6

Events occurring in meiosis l ?

Answer 6

1- Synapsis
2- Crossing over
3- Disjunction

Question 7

Capacitation ? Its time ?

Answer 7

The removal of several proteins from the plasma membrane of the acrosome of the spermatozoa

Occurs over about 7 hours in the female reproductive tract

Question 8

Sacrococcygeal teratoma ?

Answer 8

Tumor arising from remnants of primitive streak , often contains various types of tissues

Question 9

Chordoma ?

Answer 9

A tumor that arises from remnants of notochord , found either intracranially or in the sacral region