6 weeks: Arms and legs appear, reflex-arc elements appear, sympathetic ganglia form segmental masses, hypothalamus and epithalamus begin, and cerebral hemispheres start {hypothalamus development}. Embryo is 12 millimeters long.
Biological Sciences>Zoology>Development>Stages>Gestation>Embryo 042 Day
4-Zoology-Development-Stages-Gestation-Embryo 042 Day
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224