Embryolog Flashcards
When occurs at 10-12 days ?
Implanted trophoblast contains a bilaminar embryo
What are the layers of a blastocyst ?
When does it occur ?
Inner cells mass and trophoblast
6-10 days
What are the two layers of a bilaminar embryo ?
Epiblast
Hypoblast
What does the epiblast become ?
Embryonic ectoderm, mesoderm, endoderm
What does the hypoblast do ?
Aids formation of endoderm and mesoderm
What occurs during gastrulation ?
Axis develops - becomes bilaterally symmetrical
Three embryonic cell layers
Formation of primitive streak
When does the neural tube form ?
3-8 weeks
What is the first organ system to form ?
Central nervous system
What tissue is the neural crest ?
Ectomesenchyme
What layer is the ectoderm ?
What forms from it ?
Outer
Enamel , skin, mucous membrane of the mouth , brain, spinal chord
What layer is the mesoderm?
What forms from it ?
Middle layer
Most ct, most muscle, blood vessels , urinary, reproductive, serous membrane
What layer is the endoderm ?
What forms from it ?
Inner
Alimentary canal, respiratory system, parts of urogenital
What forms from ectomesenchyme
Most of peripheral ns Melanocytes, adrenal medulla Most mesenchyme in the head Dentine, cementum, pulp ect NOT ENAMEL
