Prenatal Developmeny

Question 1

Process of gastrulation

Answer 1

Begins 3rd week
Formation of 3 primary germ layers( ectoderm, mesoderm, endoderm )
Formation of primitive streak from epiblast
Caudal end of primitive streak emits growth factors -> direct cells to multiply
Migration causes epithelial to mesenchymal trantuoon
Cells migrate towards and through primitive streak

Question 2

What haponed to each germ layer as embryo develops

Answer 2

Ectoderm - nervous system , skin, sensory organs
Mesoderm - muscles skeleton, kidneys , RPRDS, heart
Endoderm - endocrine glands , lungs digestive tract

Question 3

What determines formation of neural plate

Answer 3

Notochord - transient embryonic structure formed from mesoderm , essential for tissue patterning

Question 4

What is neuralation in organogenesis

Answer 4

Formation of neural tube , precursor of brain and spinal cord
Thickening if specialised ectoderm into neural playe