Implantation

Question 1

When does the oocyte become an embryo?

Answer 1

After Syngamy

Question 2

What does the term conceptus all entail?

Answer 2

Embryo during early embryonic stage, fetus and placenta

Question 3

Describe a cleavage that occurs in the ZP

Answer 3

Zygote undergoes mitotic diviosions

Question 4

What is a blastomere?

Answer 4

A two celled embryo from the first cleavage division.

Question 5

What is totipotency?

Answer 5

When the blastomere has potential to form a fully developed individual
Has not been seen past a 16 cell stage

Question 6

What is Morula?

Answer 6

Solid ball of cells in which the cells in the center begin to compact more than the outer region

Question 7

What is MRP?

Answer 7

Maternal Recognition of Pregnancy

Question 8

What is MRP in the mare?

Answer 8

Presence of conceptus, endometrial PGF2a is reduced- Consceptus goes to different uterine horns 12-14 times a day to prevent PGF2a

Question 9

List the species and their pregnancy recognition factors

Answer 9

Cow- bIFN-t
Ewe- oIFN
Sow- Estradiol
Horse- 3 Proteins and Estrogen

Question 10

List the 4 extra embryonic membranes

Answer 10

Yolk sac
Allontois
Amnion
Chorion

Question 11

What makes the amnion and chorion?

Answer 11

Trophoblast and primitive endoderm

Question 12

What extra embryonic membranes is the fetus contribution providing space for attachment?

Answer 12

Chorioallantonic

Question 13

What is the purpose of the amnion?

Answer 13

Fluid filled sac to protect the fetus

Question 14

What does the Allontois do?

Answer 14

Collects waste from the fetus

Question 15

What is the yolk sac made of?

Answer 15

Primative endoderm

Question 16

What three things compose the extra embryonic membranes?

Answer 16

Primitive endoderm, trophoblast and embryo

Question 17

What is an ootid?

Answer 17

when female and male pronuclei can be observed in the oocyte

Question 18

What are tight junctions?

Answer 18

outer cells that have cell-cell adhesion and allow water to diffuse into the cell

Question 19

What are the gap junctions?

Answer 19

Cells in the inner portion which allow for intercellular communication

Question 20

Describe MPR in the cow.

Answer 20

Recognized 15-18 days from bIFN-t which blocks oxytocin receptors in the uterus, causing for less areas for sperm to bind to, and PGF2a is reduced
Proteins are made for implantation

Question 21

Describe MPR in a sheep.

Answer 21

Recognized 12-14 days from oIFN-t which blocks oxytocin receptors in the uterus, causing for less areas for sperm to bind to, and PGF2a is reduced
Proteins are made for implantation

Question 22

Describe MPR in the mare

Answer 22

12-14 days the spherical conceptus is bouncing in the uterus and releases 3 proteins and estrogen causing PGF2a to be reduced

Question 23

Describe the MPR in the sow.

Answer 23

11-12 days the embryo makes E2, which produces prolactin receptors where PGF2a is rerouted so it can’t kill the CL