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embryology 2026

C4H c4h Avian Bowl

QuestionAnswer
What 3 things happen before egg laying? 1. Fertilization 2. Division and growth of living cells 3. segregation of cells into groups of special functions
What thing happens between laying and incubation? 1. virtually no growth. Stage of inactive embryonic life.
What happens on day one of incubation? 1. development of blastoderm 2. major developments under a microscope from hrs 18-24
What is the major development under a microscope on day one of incubation at 18 hrs? 18 hrs: appearance of alimentary tract
What is the major development under a microscope on day one of incubation at 19 hrs? 19 hrs: beginning of brain crease
What is the major development under a microscope on day one of incubation at 20 hrs? 20 hrs: appearance of vertebral column
What is the major development under a microscope on day one of incubation at 21 hrs? 21 hrs: beginning formation of brain and nervous system
What is the major development under a microscope on day one of incubation at 22 hrs? 22 hrs: beginning formation of head
What is the major development under a microscope on day one of incubation at 23 hrs? 23 hrs: appearance of blood island
What is the major development under a microscope on day one of incubation at 24 hrs? 24 hrs: beginning formation of eyes
What 3 main thing happen on day 2 of incubation? 1. embryo begins to turn of the left side 2. blood vessels appear in the yolk sac 3. major developments under a microscope at hrs 25, 30, 35, 36, and 46
What is the major development under a microscope on day 2 of incubation at 25 hrs? 25 hrs: beginning formation of veins and heart
What is the major development under a microscope on day 2 of incubation at 30 hrs? 30 hrs: 2nd, 3rd, and 4th vesticles of brain clearly defined, as is heart, which now starts to beat
What is the major development under a microscope on day 2 of incubation at 35 hrs? 35 hrs: beginning formation of ear pits
What is the major development under a microscope on day 2 of incubation at 36 hrs? 36 hrs: first sign of amnion
What is the major development under a microscope on day 2 of incubation at 46 hrs? 46 hrs: formation of the throat
What 2 things happen on day 3 of incubation? 1. beginning of formation of nares, wings, legs and allantois 2. amnion completely surrounds embyro
What 3 things happen on day 4 of incubation? 1. beginning formation of the tongue 2. embryo completely separate from yolk sac & turned on left side 3. allantois breaks through amnion
What 2 things happen on day 5 of incubation? 1. proventriculus and gizzard formed 2. formulation of reproductive organs- sex division
What 3 things happen on day 6 of incubation? 1. beginning formation of beak and egg tooth 2. main division of legs and wings 3. voluntary movement begins
What 2 things happen on day 7 of incubation? 1. indications of digits in legs and wings 2. abdomen more prominent due to development of viscera
What thing happens on day 8 of incubation? 1. beginning formation of feathers
Created by: Fly123
 

 



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