The entry of vessels into the brain surface with a view to the fine surface configuration of the channel of entry.
D000818:Animals; D000882:Haplorhini; D008578:Meninges / Q000033:anatomy & histology; D008854:Microscopy, Electron; D009457:Neuroglia; D010841:Pia Mater / Q000033:anatomy & histology / Q000098:blood supply*