METASTASIS 



756 



METENTERON 



Metastasis (met-as f -tas-is) \_pedioTdvai, to transpose]. 

 I. The change in position, manifestation, or character 

 of a disease ; thus, in mumps, the inflammation of 

 the parotid sometimes disappears in a (metastatic) 

 orchitis. Such cases are possibly explained by the 

 transfer of the pathogenic virus from one place to 

 another by the blood-current. 2. In pathology, the 

 reproduction of disease at a distance from the primary 

 seat by the conveyance of the causal agents through 

 the blood or lymph-channels. 



Metastate (jnet'-as-tat) (perd, beyond ; ararog, placed] . 

 Any substance produced by a metabolic process ; an 

 anastate or a catastate. Same as Mesostate. 



Metastatic [niet-as-laf -ik) \_ptTacTariKog, from pedia- 

 ravai, to transpose]. Characterized by or pertaining 

 to metastasis. M. Abscess, the secondary abscesses 

 in pyemia. M. Calcification, calcareous infiltration 

 due to an excess of lime-salts in the blood in diseases 

 associated with rapid disintegration of bone. 



Metasternum [met-as-ter 1 '-num.) \_perd, behind; oripvov, 

 breast : pi. , Metastema\ . In biology, the xiphister- 

 num, or in insects the sternite of the metathorax. 



Metasthenic (met-as-then'-ik) \_perd, behind ; aOevog, 

 strength, might]. In biology, having a strong, well- 

 developed hind-region to the body. 



Metastoma {niet-as' -to-mah) \jierd, behind ; cropa, 

 mouth]. In biology, the membranous appendage 

 that lies behind and over the mandibles in Crustacea ; 

 the posterior lip of some authors. 



Metasyncrisis (met-as-in' '-kris-is) [peraavyicpiveiv , to 

 discharge morbid fluids through pores]. I. An in- 

 duced crisis. 2. The restoration of diseased tissues. 



Metasyncritic (niet-as-in-krit f -ik) [peTaavynpivEcv , to 

 discharge morbid fluids through pores]. Pertaining 

 to metasyncrisis ; alterative. 



Metatarsal (met- at- ar'- sal) \_perd, beyond; rapcdg, 

 tarsus]. Pertaining to the metatarsus. 



Metatarsalgia (niet-at- ar -sal' '-je- ah) [//era, beyond; 

 rapadg, tarsus ; dXyog, pain]. Morton 's toe ; a painful 

 affection of the plantar digital nerves directly caused 

 by pressure upon or pinching of them by certain por- 

 tions of the metatarso-phalangeal articulations — es- 

 pecially the fourth. See Diseases, Table of. 



Metatarsen (mel-at-ar' -sen) [perd, beyond; rapcog, 

 tarsus]. Belonging to the metatarsus in itself. 



Metatarso-phalangeal (met-at-ar -so -fa - lan'-je- al) 

 [fierd, beyond; rapadg, tarsus; pd/layf, phalanx]. 

 Pertaining to the metatarsus and the phalanges. 



Metatarsus (met-at-ar' -sus) \_perd, beyond ; rapadg, 

 tarsus://., Metatarsi]. The bones of the arch of 

 the foot, five in number, situated between the tarsus 

 and the phalanges ; the instep. In entomology : (a) the 

 terminal joint or appendage of the tarsus of an in- 

 sect's leg, called planta empodium, scopula ; (b) the 

 entire foot of the hind-leg. 



Metatela (met-at-e f -lah) [perd, behind; tela, tissue]. 

 The tela of the metencephal ; the velum medullare 

 posterius, or inferior choroid tela. It constitutes the 

 roof of the metacele. 



Metathesis (mrt-ath' '-es-is) \_perd, beyond ; riBhai, to 

 place]. An operation designed to effect a transforma- 

 tion or change in the seat of disease from one part to 

 another. In chemistry, the interchange of two ele- 

 ments in decomposition. 



Metathetic (met-ath-ef -ik) [perd, beyond; rtfitvai, to 

 place]. Of the nature of a metathesis. 



Metathoracotheca (met-ath-o-rak-o-the' -kah) [//era, 

 beyond ; 06pa^, the chest ; (hfictj, a case : pi. , Meta- 

 thoracothecaf]. In entomology, that part of the integu- 

 ment covering the metathorax in a pupa. 



Metathorax (met-ath-o'-raks) \_ptrd, beyond; 06paS;, 

 the chest]. In biology, the third and last segment of 



the thorax in insects ; it bears the third pair of legs 

 and the second pair of wings, and is composed of the 

 metasternum, metapleura, and post-dorsum. 



Metatocia (i?iet-at-o' -ke-ah) \_perd, beyond ; roKog, 

 birth]. Birth by any other than the normal process, 

 as by Cesarean section. 



Metatrophia (met-at-ro' -fe-ah) \jierd, beyond ; Tpixp/j, 

 nourishment]. Any morbid condition or process of 

 nutrition. 



Metaxin (niet-aks' '-in) [pera^l', between]. A proteid 

 found by Schwartz in the plasmatic substratum of 

 chlorophyl-grains. It is easily digested by both pep- 

 sin and trypsin. 



Metaxylene (met-aks'-il-en) [ptrd, beyond ; gvlov, 

 w r ood]. One of the constituents of xylol. 



Metazoa (met-az-o' -ah) [perd, beyond ; (,£x>v, animal]. 

 Animals whose development is characterized by 

 segmentation of the ovum. They comprise all 

 animals except the Protozoa. 



Metazoan (met-az-o' '-an) [«erd, beyond; ^€x>v, animal]. 

 I. A member of the Metazoa. A multicellular ani- 

 mal having a transitional stage (Gastrula) in its 

 development, corresponding to a hypothetic ancestor, 

 the Gastrcca, which is held to have arisen from a 

 Protozoan colony in the shape of a hollow sphere, by 

 the formation and gradual deepening of a depression 

 or invagination. 2. Pertaining to the metazoa. 



Metecious (met-e' -she-us) \_perd, beyond; ohog, a 

 house]. See Heterecious. 



Metembryo (met-em' '-bre-o) [perd, after ; epfipvov, 

 embryo]. In biology, the gastrula stage of the meta- 

 zoan embryo. 



Metencephal (met-en-sef'-al). Same as Metencephalon. 



The 



Metatarsus and 

 jacent Bones. 



Ar> 



1. Inferior surface of calcaneum. 

 2. Inner tuberosity. 3. Outer 

 tuberosity. 4. Angular de- 

 pression between these tuber- 

 osities. 5. Inferior portion 

 of head of astragalus. 6. 

 Plantar surface of cuboid, for 

 attachment of inferior cal- 

 caneocuboid ligament. 7. 

 Tuberosity of cuboid. 8. Sca- 

 phoid. 9. Tuberosity of sca- 

 phoid. 10. Inferior portion of 

 internal cuneiform. 11. Apex 

 of middle cuneiform. 12. 

 Apex of internal cuneiform. 

 13, 14, 15, 16, 17. First, second, 

 third, fourth and fifth meta- 

 tarsal bones. 18. Tuberosity 

 of fifth metatarsal bone. 19. . 

 Two sesamoid bones. 20. '' 

 First phalanx of great toe. 



21. Last phalanx of great toe. a 



22, 22. First phalanges of re- 

 maining toes. 23,23. Second 

 and third phalanges of these 

 toes. 



Metencephalic (met-en-sef-al'-ik) [mm. after ; 



Xog, brain]. Pertaining to the metencephalon. 

 Metencephalon (met-en-sef'-al-on) [inru. after; 



eynE<paXng, brain]. I. The afterbrain ; the post-d 



ata, or most caudal portion of the brain. 2. k 



the cerebellum and the pons. 

 Metensomatosis (ntet-en-so-mat-o' '-sis) [perd, 1>< 



traupdrumg, embodiment]. Transformation in 



union with another body. 

 Metenteron (met-en' '-ter-ott) [/<frd, after; Ivrepov, M 



testine]. The enteron in any secondary or speci 



state due to modification of the archenteron. 



