GLOSSARY. 259 



Perone'al. [From the Gr. perone, the " fibula."] Pertaining to the fibula ; 

 a term applied to muscles or vessels in relation to the fibula. 



Pe'trous. [From the Gr. petra, a " rock."] Having the hardness of rock. 



Pey'er's Glands. The clustered glands in the intestines, so named after the 

 anatomist, Peyer, who well described them. 



Phalan'ges. [Lat. pi. of phalanx, a "closely-serried array of soldiers."] A 

 name given to the small bones forming the fingers and toes, because 

 placed alongside one another like a phalanx. 



Phar'ynx. [ From the Gr. pharao, to " plough," to " cleave."] The cleft or 

 cavity forming the upper part of the gullet. 



Phren'ic. [From the Gr. phren, the "diaphragm."] Pertaining to the dia- 

 phragm. 



Pi'a Ma'ter. [Lat. pia (fern.), "tender," "delicate," and mater, "mother."] 

 The most internal of the three membranes of the brain. See Dura 

 Mater. 



Pig'ment. [From the Lat. pigmentum, " paint," " colour."] Colouring matter. 



Pin'na. [Lat. a "feather" or "wing."] External cartilaginous flap of the 

 ear. 



Placen'ta. [Lat. a " thin, flat cake."] A fiat, circular, vascular substance 

 which forms the organ of nutrition for the foetus in utero. 



Plan'tar. [From the Lat. planta, the "sole of the foot."] Pertaining to the 

 sole of the foot. 



Plas'ma. [From the Gr. plasso, " to form."] A tenacious plastic fluid, form- 

 ing the coagulating portion of the blood; that in which the blood-cor- 

 puscles float; the liquor sanguinis. 



Pleu'ra. [Gr. the "side."] A serous membrane divided into two portions, 

 lining the right and left cavities of the chest, and reflected over each Inng. 



Plex'us. [From the L&t.plecto, plexum, to " knit " or " weave."] A network 

 of nerves or veins. 



Pneumogas'tric. [From the Gr. pneumdn, a "lung," and gaster, the "stom- 

 ach."] Pertaining to the lungs and stomach. 



Polyhe'dral. [From the Gr. polys, "many," and hedra, a " base," a " side."] 

 Many-sided. 



Pons Varo'lii. [Lat.] "Bridge of Varolius." The white fibres which form 

 a bridge connecting the different parts of the brain, first described by 

 Varolius. 



Poplite'al. [From the Lat. poples, poplitis, the " ham," the "back part of the 

 knee."] The space behind the knee-joint is called the popliteal space. 



Prismat'ic. Resembling a prism, which, in optics, is a solid, glass, triangu- 

 lar-shaped body. 



Prona'tion. [From the Lat. pronus, "inclined forwards."] The turning of 

 the hand with the palm downwards. 



Prona'tor. The group of muscles which turn the hand palm downwards. 



Pro'teids. A general term for the albuminoid constituents of the body. 



Pro'toplasm. [From the Gr. prdtos, " first," and plasxo, to " form."] Afirst- 

 formed organized substance ; primitive organic cell matter. 



Pseudostom'ata. [From the Gr. pseudes, "false," and sloma, stomatos, a 

 " mouth."] False openings. 



