250 PRINCIPLES OF PHYSIOLOGY 



Morphology (Greek, morphe, form ; logos, an account). 

 The science that investigates the laws of form and 

 arrangement of parts of the bodies of plants and 

 animals. 



Myosin (Greek, mus, muscle). A globulin found in 

 muscle. 



Myxoedema (Greek, muxa, mucus ; oedema, a swelling). 

 A disease in which the thyroid body is atrophied and 

 the connective tissues of the body are infiltrated 

 with a mucus-like matter. 



Neuron. A nerve cell. See text. 



Nuclein. A complicated chemical substance containing 

 phosphorus, found in nuclei. 



Nucleus. A kernel, a body found in cells. 



Oesophagus (Greek, oisophagos, oio, oiso, to carry ; phago, 

 to eat). The carrier of food, the gullet. 



Ontogenesis (Greek, onta, things ; genesis, creation). The 

 history of the development of the individual. 



Pepsin (Greek, pepio, to digest). The enzyme of the 

 gastric juice. 



Periosteum (Greek, periosteos, around the bones). The 

 connective tissue covering of the bones. 



Pharynx (Greek, pharungx, the throat). The musculo- 

 membranous bag or cavity leading into the gullet. 



Placenta. The afterbirth. 



Protein (Greek, proteno, to be in the first place). A sub- 

 stance containing carbon, hydrogen, oxygen, and 

 nitrogen. Ex. : Albumen (white) of egg. 



Proteolysis. The decomposition of proteins. 



Protoplasm (Greek, protos, first ; plasma, something 

 formed or moulded). See text. 



Ptyalin (Greek, ptualon, saliva). The enzyme of saliva. 



Pylorus (Greek, pule, a gate ; ora, care). A gate-keeper. 

 The passage leading from the stomach into the 

 duodenum. 



Racemose (Latin, racemus, bunch of grapes). A special 

 form of gland with branching ducts and acini or 

 pouches, at the termination of the smallest ducts* 



