Embryonic development

Question 1

how long can ova survive

Answer 1

12-72 hours

Question 2

how long can sperm survive

Answer 2

up to 7 days

Question 3

gestational length in dogs

Answer 3

-58-68 days
-average of 63 days

Question 4

ovum

Answer 4

-days 2-17
-sperm fertilizing ovum
-zygote dividing by mitosis
-morula (solid ball of cells)
-blastula (hollow ball of cells)
-blastocyst implanted in wall of uterus

Question 5

embryo development

Answer 5

-18-35 days
-ectoderm: epidermis of skin and neural tissues
-endoderm: gut lining and respiratory tract lining
-mesoderm: urogenital, circulatory and musculo-skeletal systems

Question 6

canine embryo

Answer 6

-pharyngeal arches
-somites
-heart
-optical globe
-limb buds

Question 7

canine embryo
pharyngeal arches

Answer 7

-develop into the bones and muscles including: upper and lower jaw, bones of middle ear, muscles for mastication, muscles of the face, hyoid bone

Question 8

canine embryo
-somites

Answer 8

-develop into vertebrae rib cage, skeletal muscle

Question 9

fetus

Answer 9

-day 35
-appearance of external features growth of hair and claws
-growth of the external ear
-hair and skin pigmentation
-sexual differentiation

Question 10

placenta attachment for the fetus

Answer 10

-zonary placenta
-band across the back of sac
-blood exchange of mom and fetus
-chorionic villi

Question 11

feline embryo

Answer 11

-heart
-neural plate and cephalic process
-limbs
-eye