. Journal of anatomy. ounded lobules, all of whichhave now lost their lumina. The cells are very clearly differentiated intochromophilic () and chromophobic types, the former showing up asclear bright-red patches in the tissue (represented black in figures). The pars tuberalis forms a collection of branched tubules lying betweenthe body of the pars distalis and the diencephalic floor anterior to theinfundibular process. It is still connected by a cell cord with the ventralside of the pars buccalis. The Development of the Hypophysis Cerebri, etc., in Marsupialia 223 The infundibular proce
. Journal of anatomy. ounded lobules, all of whichhave now lost their lumina. The cells are very clearly differentiated intochromophilic () and chromophobic types, the former showing up asclear bright-red patches in the tissue (represented black in figures). The pars tuberalis forms a collection of branched tubules lying betweenthe body of the pars distalis and the diencephalic floor anterior to theinfundibular process. It is still connected by a cell cord with the ventralside of the pars buccalis. The Development of the Hypophysis Cerebri, etc., in Marsupialia 223 The infundibular process has increased somewhat in size, but is stillrelatively small, and is hollow. Its walls have increased in thickness to aslight extent. Seessels pocket can be clearly identified in the posterior portion of thehypophysis. Its caudal portion is free, and is separated from the sub-stance of the pars buccalis by a definite connective tissue sheath. Itscaudal extremity retains its original form and relations, lying partly. Fig. 39.—Stage I. Phascolonujs mitcheUi{ 85 mm.). Longitudinalsection through hypophysis and Seessels pocket. SI. 8-2-8. D., duct; , distal lobe ; , infundibular process ; , remnant of oral plate ;, proliferation of entoderm; , proximal lobe; , Rathkes pouch;, Seessels pocket. ventral to and between the two halves of the posterior extremity of thepars buccalis. The anterior portion of Seessels pocket fuses with theventral side of the pars distalis and becomes absolutely indistinguishablefrom it (fig. 38, ). Phascolomys initdielli.—In Phascolomys also Seessels pocket persistsand forms part of the hypophysis, but certain points of difference may benoted bet\veen the development in this form and in Phascolarctos. Stage I. (a) 9 mm.—Rathkes pouch is already established, andclosely resembles that of Phascolarctos, Stage II., having well-marked 224 Dr Katharine M. Parker proximal and distal lobes. It is widely open in its
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectanatomy, bookyear1867
