Fichas
OCB02-1004-Embryogenesis
Fichas del conjunto (23)
- 1What does the blastocyst give rise to?Epiblast and hypoblast
- 2What are the two layers of the blastocyst?1. Trophectoderm: embryonic tissue
2. Inner cell mass: Generates embryo, contains embryonic stem cells - 3How does the blastocyst implant into the uterine wall?Trophectoderm sends processes to infiltrate wall
- 4What is gastrulation?The generation of the 3 germ layers:
1. Ectoderm
2. Medoderm
3. Endoderm - 5What are the functions of the hypoblast (outside) and epiblast (inside) made by the inner cell mass? What do they form after?Hypoblast: extra embryonic structure
Epiblast: source of embryo and three germ layers
The primitive streak - 6What do cells ingressing into the primitive streak form? What do cells at the surface form? What is the order?The endoderm/mesoderm
The ectoderm
Endo, meso, ecto - 7What do the engressing cells form? In what order?Endoderm (1st)
Mesoderm (2nd)
Ectoderm (3rd)
- However, they form from cells left behind - 8Endoderm gives rise toGI tract
Lung
Pancreas
Liver
Thymus - 9Mesoderm gives rise toVertebral column
Skeleton
Skeletal muscle
Circulatory system
Blood
Kidney - 10Ectoderm gives rise toSkin
Nervous system - 11What do cells that move to the tip of the primitive streak form?Midline/dorsal structures
- 12What do cells that are more along the primitive streak form?Paraxial/ventral structures
- 13What determines the medial lateral axis during gastrulation?The POSITION of the cells along primitive streak
- 14What determines the head-tail axis during gastrulation?The TIMING of when cells migrate to positions
- 15What do cells that move first form?Structures at the rostral (head)
- 16What do cells that move later form?Structures at the Caudal (tail)
- 17Where does the neural plate form?The ectoderm
- 18What does the neural plate give rise to?The central nervous system
- 19What is the process of neural plate folding and neuralation?1. Neural plate folds into neural tube
2. Closure of the neural tube (neuralation)
3. Signals from the axial mesoderm leads to neuron formation/eyefield seperation
4. Edges of ectoderm wrap around meso/endoderm - 20Where do motor neurons form?Ventral (under) end of the neural tube
- 21Where do sensory neurons form?Dorsal (upper) end of the neural tube
- 22What are neural crest cells?Migratory cells from the dorsal neural tube
Different migratory paths leads to different structures - 23How are cranial neural crest cells (CNCCs) formed?NCCs are formed at the edges of the neural tube (neural folds) and migrate ventrally which accumulate in pharyngeal a riches of the embryo
Información
- Descripción
- Define endoderm, mesoderm and ectoderm Understand how the germ layers are formed during embryogenesis List the derivates of each germ layer and to name the germ layer origin of different facial structures Understand how the 3D shape of the body and head forms from three germ layer Understand how the head to tail axis is set up
- Creado por
- Evian Chai
- Visitas
- 34
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