After Gastrulation, the Next Event in Human Embryo Formation Is

question 68

Multiple Choice

After gastrulation, the next event in human embryo formation is ____.

• A) formation of the bones
• B) formation of the neural tube
• C) the initiation of the heartbeat
• D) formation of the pharyngeal arches
• E) apoptosis between fingers and toes

---

Definitions:

Pia mater

The delicate innermost layer of the meninges that directly covers the surface of the brain and spinal cord, providing it with blood vessels.

Meninges

The three protective membranes that cover the brain and spinal cord, consisting of the dura mater, arachnoid mater, and pia mater.

Subarachnoid space

The space surrounding the brain and spinal cord, situated between the arachnoid membrane and the pia mater, which contains cerebrospinal fluid.

Subarachnoid space

The fluid-filled space surrounding the brain and spinal cord between the arachnoid membrane and the pia mater.