Development of CNS

Is derived from Ectoderm

Is derived from Endoderm

Is derived from Mesoderm

Develops from neuroectoderm

Formation of neural plate and neural tube is known

Melanocytes derived from neural crest cells

Melanocytes are derived from Endoderm

The first stage includes formation of neural plate

The first stage includes formation of neural tube

CNS appears at the beginning of the third week of embryo age

CNS appears at the beginning of the sixth week of embryo age

CNS appears at the beginning of the 10th week of embryo age

Part of ectoderm differentiates into neuroectoderm

all of the ectoderm differentiates into neuroectoderm

The cranial open end of the tube is the anterior (rostral) neuropore

the caudal open end of the tube is the posterior (caudal) neuropore

the cranial open end of the tube is the posterior (caudal) neuropore

The caudall open end of the tube is the anterior (rostral) neuropore

Ependymal cells

Schwann cells

Satellite cells

Fibrous astrocytes

Microglia

Melanocytes

C-cells of thyroid gland

Schwann cells

Medulla of adrenal gland

Mesenchyme of the pharyngeal arches

Adenohypophysis

Parathyroid

Closure of neuroporus anterior – 25th day of pregnancy

Closure of neuroporus posterior – 28th day of pregnancy

Neural plate – 17th day of pregnancy

Neural plate – 36th day of pregnancy

Neural groove – 18th-21st day of pregnancy

Neural tube and Neural crest – 21st day

Neural tube and Neural crest – thst day

Closure of neuroporus anterior - 28th day of pregnancy

Closure of neuroporus posterior – 25th day of pregnancy

Neural groove - 15th day of pregnancy

Schwann cells derived from neural crests

Schwann cells derived from mesenchyme

Neural plate appears in 17th day

Neural plate appears in 21st day

Neurons of CNS derived from neural tube

Neurons of CNS derived from neural crest

Melonocytes derived from wall of neural crest

Melonocytes derived from ectoderm

Neural groove (neurolation) – 18-21st day

Neural groove (neurolation) – 25-28th day