Skip Navigation
The Endowment for Human Development
The Endowment for Human Development
Improving lifelong health one pregnancy at a time.
Donate Now Get Free Videos

Movie Theater

Right- and Left-Handedness


8 weeks

From The Biology of Prenatal Development.Buy Now

Script: 到8週,75%的胚胎 展示右手向先。 餘下的胚胎中 左手向先和 沒有偏愛者 各佔一半。 這是右手或左手向先 舉止的最早跡象。

All ages referenced to fertilization, not last menstrual period.
See Snapshots   |   Log in to create a playlist
Ovaries Identifiable
Ovaries Identifiable
The Highly Complex Brain
The Highly Complex Brain
Right- and Left-Handedness
Right- and Left-Handedness
Rolling Over
Rolling Over
Spontaneous Movement
Spontaneous Movement
Reflexive Movement
Reflexive Movement
Help give babies a healthy start and a healthy future. Donate now.
Buy the Biology of Prenatal Development DVD