Final answer:
Astrocytes, a type of glial cell in the central nervous system, originate from embryonic stem cells present in the blastula during development.
Step-by-step explanation:
Astrocytes are a type of glial cell that is abundant in the central nervous system. They have a star-shaped appearance and play various roles in the brain and nervous system, including regulating ion concentration, taking up and breaking down neurotransmitters, and contributing to the formation of the blood-brain barrier.
Astrocytes originate from the embryonic stem cells present in the blastula, which arrange themselves into three germ layers during development.