The embryonic period occurs during a woman's first trimester of pregnancy. How long is a woman's first trimester?

Process in which the blastocyst cells form three primary germ layers, which are the basic cellular structures from which all body tissues develop.

Process in which the three primary germ layers arrange themselves in ways that give rise to all organs in the body.

What major changes occur during embryonic development?

Develops into the embryo

A

C

The zygote divides several times. The conceptus goes through several rounds of mitosis before becoming a blastocyst.

The blastocyst implants in the endometrium.

Gastrulation occurs during...

Neuralation occurs during...

During gastrulation, the cells differentiate into three different germ layers. The outside layer is called...

During gastrulation, the cells differentiate into three different germ layers. The middle layer is called...

During gastrulation, the cells differentiate into three different germ layers. The inside layer is called...

The germ layer from which muscle, bone, cartilage, blood vessels, kidneys and gonads form is known as the

Gives rise to: Skin & Nervous System

The heart FIRST begins to develop during...

The nervous system FIRST begins to develop during...

The face takes on a human appearance.

Fetal heartbeat and limb movements can be detected by ultrasound

The ____________ supplies nutrients to the embryo and is the source of blood cells during early embryonic development