CYTOMOBPHOSIS 



K< ToOERM 



branous labyrinth of 

 internal car, and lining 

 of external ear. 



Epithelium lining 

 the central canal of the 

 spinal cord, and the 

 ventricles of the brain. 



All neurons and neu- 

 roirlia of the nervous 

 system. 



Certain ductless 

 glands : pineal, posteri- 

 or (nervous) portion of 

 hypophysis, medulla of 

 suprarenal, and the 

 chromaffin system or 

 paraganglia. 



Possibly smooth mus- 

 cle associated with 

 sweat glands, and in 

 iris of eye. 



c ir ( .-cal;i' tyinpani and 

 vestibuli). 



Bartholin in the fe- 

 male. 



Xtulei pulposi of 

 intervertebrul discs., re- 

 nv.ii s of the embryonic 

 r.oto ho-d. (Ofer-toder- 

 iml origin h the guinea 

 pig, according to G. 

 Carl Huber; Anat. 

 Rec., Vol. 14, p. 217, 

 1918.) 



CYTOMORPHOSIS 



From the standpoint of the individual cells of tissues, histogenesis 

 involves progressive and regressive changes. This process may be desig- 

 nated as cytomorphosis (Minot). The gradual acquirement of definite 

 form by development is known as morphogenesis. Cytomorphosis in- 

 cludes several successive steps: (a) undifferentiated or embryonal stages; 

 (b) differentiated stage, during which the cell acquires and maintains its 

 maximum differentiation expressed structurally by a definite shape and 

 specific content and performs its specific function; (c) regressive, when 

 the function gradually wanes, and finally fails (reflected in coincident 

 protoplasmic alterations), the cell concerned suffering death and ulti- 

 mately removal from the body. 



With this preliminary general view of protoplasmic organization and 

 function (general cytology) we arc prepared to approach histology proper. 



