pars intermedia
/ˌpɑːz ɪntəˈmiːdɪə/Anatomy and Zoology
noun
The intermediate or middle section of an organ or part; specifically a part of the hypophysis between the neurohypophysis and the pars distalis of the adenohypophysis, variously regarded as part of the adenophysis or neurohypophysis, and rudimentary in humans.
Origin
Mid 19th century; earliest use found in Henry Gray (d. 1861), anatomist and author. From scientific Latin pars intermedia from classical Latin pars + intermedia, feminine of intermedius intermediate.