Table 1.

Stages of differentiation of the human choroid plexus according to Netsky and Shuangshoti [136].

	Stage 1	Stage 2	Stage 3	Stage 4
Time of development	7th Week	9th Week	17th week	29th week
Duration of development	2 Weeks	8 weeks	12 weeks	11 weeks
Epithelium	Pseudo-stratified, tall, central nuclei	Low columnar, apical nuclei	Cuboidal, apical and central nuclei	Cuboid or squamous, central and basal nuclei
Glycogen	Absent	Abundant	Moderate	Minimal and absent
Villi	Absent	Sparse	Primary villi	Villi with multiple fronds
Stroma	Loose mesenchyme	Small numbers of connective fibres	Moderate numbers of fibres	Large numbers of fibres and meningocytes
Blood Vessels	Ill-defined vascular walls	Defined vascular walls	Well-formed vascular walls	Same
Size in relation to ventricle	Tiny	Extremely large	Moderately large	Small