Page 748 - Atlas of Histology with Functional Correlations

FIGURE 19.2 ■ Hypophysis (panoramic view, sagittal section). Stain:
hematoxylin and eosin. Low magnification.

FIGURE 19.3 ■ Hypophysis: sections of pars distalis, pars intermedia, and pars
nervosa. Stain: hematoxylin and eosin. Medium magnification.

The pars intermedia (9) and pars nervosa (11) form the posterior lobe of the
hypophysis. The pars nervosa (11) consists primarily of unmyelinated axons and

supporting pituicytes. A connective tissue capsule (1, 10) surrounds the pars
distalis (5) and pars nervosa (11) portions of the gland.

The pars intermedia (9) is situated between the pars distalis (5) and the pars
nervosa (11) and represents the residual lumen of the hypophyseal (Rathke)
pouch. The pars intermedia (9) normally contains colloid-filled vesicles (9a) that

747