GLOSSARY. 367 



Oxy-hemoglobin (ok-si-hem-o-glo'-bin). Hemoglobin united, molecule 

 for molecule, with oxygen. It is the characteristic constituent of 

 the red corpuscles to which the scarlet color of arterial blood is 

 due. 



Pancreas (pan'-Tcre-as}. A large racemose gland lying transversely 

 across the dorsal wall of the abdomen. It secretes a clear liquid 

 for the digestion of proteids, fats, and carbohydrates. The sweet- 

 bread of animals, vulgarly called the " belly sweet-bread " in con- 

 tra-distinction to the thymus, or true sweet-bread. 



Pancreatin (pan'-kre-a-tin). The active element of the pancreatic juice. 



Papilla (pa-piT-a), pi. papillae. Any soft, conical elevation, as papillae 

 of the dermis, tongue, etc. 



Papillary (pap'-i-la-ri). Pertaining to a papilla; papillary muscles, 

 the conic muscular columns of the heart, to which the chordae 

 tendineae are attached. 



Parietal (pa-ri'-e-tal). Pertaining to the walls, as the parietal bone. 



Parotid (pa-rot'-id). Near the ear, as the parotid salivary glands. 



Patella (pa-tel'-a}. The knee-pan. 



Peptone (pep'-ton}. A proteid body produced by the action of peptic 

 and pancreatic digestion. 



Pericardium (per-i-kar'-di-um). The closed membranous sac or cover- 

 ing that envelops the heart. 



Periosteum (per-i-os'-te-uni). A fibrous membrane that invests the 

 surfaces of the bones, except at the points of tendinous and liga- 

 mentary attachments, and on the articular surfaces where cartilage 

 is substituted. 



Peristaltic (per-i-stal'-tik}. The peculiar movement of the intestine 

 and other tubular organs, consisting in a vermicular shortening 

 and narrowing of the tube, thus propelling the contents onward. 

 It is due to the successive contractions of the bundles of longitudi- 

 nal and circular muscular fibers. 



Peritoneal (per-i-to-ne'-al). Pertaining to the peritoneum. 



Peritoneum (per-i-to-ne'-um}. The serous membrane lining the interior 

 of the abdominal cavity, and surrounding the contained viscera. 

 The peritoneum forms a closed sac, but is rendered complex in its 

 arrangement by numerous foldings produced by its reflection upon 

 the viscera. 



Phalanges (fa-lan'-jez\ plural of phalanx (fa'-langks). Any one of 

 the bones of the fingers or toes. 



