Slide showing diagram of 'Mesial sagittal section through pituitary of a 5th month human foetus.' Slide shows diagram of 'Mesial sagittal section through pituitary of a 5th month human foetus.' Handwritten white label on top of slide reads 'Pituitary development 2'. Diagram is labelled 'a' to 'h', explanation is given in the key: 'Fig. 88. - Mesial sagittal section through pituitary of a 5th month human foetus. (Herring.) a, chiasma; b, pars tuberalis (tongue-like process of Herring); c, infundibular extension of the thrird ventricle; d, pars anterior; e, neck connecting base of brain at infundibulum with pars nervosa; f, extension of epithelium tuberalis of pars over neck; g, intraglandular cleft; h, pars nervosa, separated from cleft by pars intermedia.' Late 19th to early 20th century