Template:2010BGDLab6weeks

Additional Information

Detailed Week by Week

The following information is a detailed timeline of embryonic development between week 3 to 8 and content does not form part of the current practical class.

Week 3 | Week 4 | Week 5 | Week 6 | Week 7 | Week 8

Embryo Stages and Events

Day	Stage	Event
15
16	Stage 7	Primitive node (Hensen's node, primitive knot) The small circular region located at the cranial end of the primitive streak, where gastrulation occurs, and is a controller of this process. The second role is to act as an initial generator of the left-right (L-R) body axis.
17
18	Stage 8	Neural neurogenesis, neural groove and folds are first seen
19
20	Stage 9	Musculoskeletal somitogenesis - first somites form and continue to be added in sequence caudally Neural - three main divisions of the brain, which are not cerebral vesicles, can be distinguished while the neural groove is still completely open
21		Heart cardiogenesis - week 3 begins as paired heart tubes.