Originally, the lecture was given in Sanin-tei, a study of the head of the Sugawara clan, but as the number of students increased, the lecture began to take place in the hallway (chumonro - covered entrance arcade) of Shinden-zukuri style - architecture representative of a nobleman's residence during the Heian period) -- That was why the lecture was called Kanke Roka (the hallway of Sugawara's house) and remembered in later ages.
元来は菅原氏当主の書斎であった山陰亭で講義が行われていたが、生徒の増大につれて廊下（寝殿造の中門廊）で講義が行われたことから、菅家廊下（かんけろうか）と呼ばれて後世に知られた。