I Flashcards
What is the common stage of dog embryo development when they present similar anatomical features?
18th day of gestation
What is the common stage of bovine embryo development when they present similar anatomical features?
24tht day of gestation
What is the common stage of chick embryo development when they present similar anatomical features?
48-60th hr of gestation
Epithelia of sense organs, nasal cavity, paranasal sinuses, oral cavity originates at which type of germ layer?
Ectoderm
Example sentence: The epithelia of sense organs, nasal cavity, paranasal sinuses, oral cavity originates at the ectoderm germ layer.
Adenohypophysis originates at which type of germ layer?
Ectoderm
Example sentence: The adenohypophysis originates at the ectoderm germ layer.
Digestive tube and glands originate at which type of germ layer?
Endoderm
Example sentence: The digestive tube and glands originate at the endoderm germ layer.
Endothelium originates at which type of germ layer?
b. Mesoderm
- Endothelium originates at the mesoderm germ layer.
List the 5 early stages of embryonic development in order:
- Gametogenesis
- Fertilization
- Cleavage
- Gastrulation
- Neurulation
Type of ovum (according to the amount of yolk) of placental mammals
Microlecithal
Type of ovum (according to the amount of yolk) of birds
c. Macrolecithal
- Macrolecithal is the type of ovum with abundant yolk content in birds.
Type of ovum (according to the amount of yolk) of amphibians
a. Mesolecithal
Sex chromosome of female birds
W
Sex chromosome of male birds
d. Z
- Male birds have sex chromosomes Z.
Male bird offspring has chromosomes
b. ZZ
- Male bird offspring has chromosomes ZZ.
Female bird offspring has chromosomes
a. ZW
Example sentence: Female birds inherit the ZW chromosomes from their parents.
During fertilization, the union of the sperm and the ovum takes place in the
b. Fallopian tube
Additional information: Fertilization typically occurs in the fallopian tube.
Maximum sperm viability in cows
a. Less than 24 hrs
Maximum sperm viability in bitches
b. Up to 7 days
The pole with the highest concentration of yolk and little cytoplasm; usually endoderm
a. Vegetal pole
The vegetal pole is characterized by a high concentration of yolk and little cytoplasm.
The pole with little concentration of yolk and much cytoplasm; usually endoderm
b. Animal pole
In contrast to the vegetal pole, the animal pole has less yolk and more cytoplasm.
The fetal placenta of human beings & monkeys is made up of
a. Chorioamniotic membrane
Monkeys have a fetal placenta composed of the chorioallantoic membrane.
Placenta (based on number of layers) found in horses, pigs, and cows; partially in sheep and goats
Epitheliochorial
Example sentence: The placenta in horses is epitheliochorial.
Placenta (based on number of layers) found in carnivores (dogs, cats, fox)
Endotheliochorial
Example sentence: The endotheliochorial placenta is common in carnivores.
Placenta (based on number of layers) found partially in sheep
Syndesmochorial
Example sentence: Sheep have a syndesmochorial placenta.
Placenta (based on number of layers) found in rodents, monkeys, other primates, man
Hemochorial
Example sentence: Hemochorial placentas are found in rodents and primates.
The structure formed by one cotyledon and one caruncle is called a
placentome
