MESITVLENE 



749 



MESOCORD 



Mesitylene [mes-if -il-en) [ueoirr/c, a mediator], C 9 H 12 . 

 Triraethvl benzin. It occurs in coal-tar, and is pro- 

 duced by distilling acetone or allylene with H,S0 4 . 

 It is an oily, colorless, agreeable-smelling liquid, boil- 

 ing at 163 C. 



Mesitylenic Acid {mes-it-il-cn'-ik). See Acid. 



Mesmeric {ma-mer'-ik) [from A/esmer, an investigator 

 of mesmerism]. Pertaining to or induced by mes- 

 merism, as mesmeric sleep. M. Coma, hypnotism, 

 q. v. M. Lucidity, clairvoyance. M. Promise, 

 the same as Hypnotic Suggestion. M. Sleep, hyp- 

 notism, /. v. M. State, the condition of mesmerism. 



Mesmerism (mez'-mer-izm) [Mesmer, an investigator 

 of the phenomena]. The phenomena formerly known 



- .mnambulism, and subsequently as animal mag- 

 netism, now better known as hypnotism. 



Mesmerist I "/ez / -rrter-ist)[Afesrner, an investigator of the 

 phenomena]. One who induces mesmeric phenomena. 



Mesmerization {mez-mer-iz-a'-shun). Synonym of 

 '.tion. 



Mesmeromania {rnez-mer-o-ma f -ne-ah) [Mesmer, the 

 investigator of mesmerism ; uavia, madness]. Insane 

 or delusional pursuit of mesmeric observations. 



Meso- {rnes / -o-) [uiooc, middle]. A prefix signifying 

 middle. 



Mesoarium {mes-o-a' '-re-um) [fieooc, middle ; uaptov, 



dim. of drov, egg: //. , AIesoaria\. In biology, that 



fold of the peritoneum in certain animals {e. g., fishes) 



which forms the mesentery of the ovary. See Afeso- 



um. 



Mesoarteritis (mes-o-ar-ter-i'-tis). Synonym of A/es- 

 arWritis. 



Mesobacteria {mes-obak-te / -re-ah) [uiooc, middle ; 



- piov, little rod]. Medium-sized vegetable micro- 

 organisms. 



Mesoblast {tries' -o-blast) [ftiooc, middle; 3?mot6c, a 

 germ]. In embryology : {a) a large, granular, single 

 cell, the most posterior in each of the two bands from 

 which the mesoderm arises in a metazoan, and which 

 throws off cells to add to the mesodermal band. It 

 appears to be a derivative of the entoderm ; {b) The 

 middle layer of the blastoderm, probably derived from 

 both the ectoderm and entoderm, and from which are 

 developed the vascular, muscular, and skeletal systems, 

 the generative glands, and the kidneys. It is also 

 called mesoderm. Kleinenberg protests against the 

 use of the term mesoblast, at least in a sense imply- 

 ing any possibility of comparison with the primary 

 layers, epiblast and hypoblast, of coelenterata. M., 

 Parietal, M., Somatic, the outer mesoblastic plates 

 entering into the formation of the body-wall. It is 

 also known as Somatoplettre. M.. Splanchnic, M.. 

 Visceral, the inner mesoblastic plates forming the 

 wall of the digestive tract and its derivatives. It 

 known as Splanchnopleme. 

 lesoblastema {mes-o-blas-te' -mah) [uiooc, middle ; 

 .a shoot; //., Mesoblastemas\ In embry- 

 ology. d> e germinal cells that go to form the meso- 

 derm ; the mesoblastic cells. 

 Mesoblastic mes-o-blas'-tik) [uiooc, middle ; 3/Morog, 



sprout]. Pertaining to the mesoblast. 

 flesobranchious {mes-o-brang' -ke-us) [ueooc, middle ; 

 f«, gill]. Having the gills or branchiae in the 

 middle of the body, 

 lesobregmus {mes-o-breg* '-mus\ [ueooc, middle; 

 ua, the sinciput]. Lissauer's term for a skull in 

 which the angle formed between the radius fixus and 

 the line joining the hormium and the bregma is be- 

 tween 68 D and 82 . 

 lesobronchitis (mes-o-bron-ki'-tis) [ueooc, middle ; 

 .bronchus; trie, inflammation]. An inflam- 

 mation of the middle coat of the bronchial tubes. 



Mesobronchium {mes-o-bron' -ke-um) [ueooc, middle ; 

 3p6} \ia, bronchus]. One of the divisions, of the 

 trachea in birds. 

 Mesocaecum {mes-o-se f -kuni). See Mesocecum. 

 Mesocardia {mes-o-kar'-de-afi) [ueooc, middle ; Kaptiia, 

 heart]. The position of the heart in the central and 

 anterior part of the chest, a situation that is normal at 

 an early stage of development 

 Mesocardium [mes-o- kar* -de-urn} [ueooc, middle ; 

 napoia, heart]. A mesoblastic fold attached to the 

 heart. 

 Mesocarp {rues' '-o-karp) [ueooc, middle ; nap-oc, fruit]. 

 In biology, the middle layer of a three-layered peri- 

 carp ; the sarcocarp. 

 Mesocecum (mes-o-se J '-kum) [uiooc, middle ; cants, 

 blind]. The mesentery that sometimes connects the 

 dorsal part of the cecum with the right iliac fossa. 

 Mesocele (mes'-o-sil) [uiooc, middle ; Koit.ia, cavity]. 

 The cavity or ventricle of the mesencephal ; consider- 

 able in lower vertebrates but in adult mammals re- 

 duced to a slender passage, the aqueduct of Sylvius or 

 iter a tertio ad qua) turn ventriculum. 

 Mesoccelia {mes-o-se / -le~ah) [ueooc, middle ; Koula, 



cavity] . See Mesocele. 

 Mesocephalic {rnes-o-sef-al' -ik) [ueooc, middle ; 

 KEoa'/.r), head]. See Megacephalic. M. Pillars, in 

 entomology, a pair of strong rods running from the 

 front to the back of the inside of the head of certain 

 insects {e.g., beesi, and attached by their extremities 

 just outside and below the antennae, and at the rear of 

 the head beneath and on each side of the occipital 

 opening. (Cheshire.) 

 Mesocephalism {mes-o-sef-al-izm), Mesocephaly 

 {mes-o-sef -a/-e) [ueooc, middle ; Keqa/.r), head]. The 

 condition of having a mesocephalic skull. 

 Mesocephalitis {mes-o-sef-al-i'-tis) [fieooc, middle ; 

 Keipa/.r}, head ; trie, inflammation]. Inflammation of 

 the mesocephalon or pons Varolii. 

 Mesocephalon {mes-o-sef -al-on). See Pons Varolii. 

 Mesocerebrum {mes-o-ser'-e-brum). See Pons Var- 

 olii. 

 Mesochil (mes-o-kil'), Mesochilium {mes-o-kii' '-e-urn) 

 [uiooc, middle ; x e '' /j0C ' 1'P]- 1° bk>'ogy» the middle 

 part of the tripartite labellum of certain orchids. 

 Mesochondriac {mes-o-kon' -dre-ak) [uiooc, middle ; 

 XovSpoc, cartilage]. Situated between any two con- 

 tiguous tracheal cartilages. 

 Mesochoroidea {mes-o-ko-roid-e / -ah) [ueooc. middle ; 

 Xopiov, the chorion ; eI6oc, like] . The middle coat 

 of the choroid. 

 Mesocolic [mes-o-kol'-ik) [fieooc, middle; ku/ov, colon]. 



Pertaining to the mesocolon. 

 Mesocolon {mes-o ko* -Ion) [jiiooc, middle; ku/ov, 

 colon]. The mesentery connecting the colon with the 

 posterior abdominal wall. It is divided into ascending, 

 transverse, and descending parts. M., Sigmoid, the 

 fold of the peritoneum connecting the sigmoid flexure 

 with the left iliac fossa. 

 Mesoconch (mes'-o-kongk) [fieooc, middle; Koyxv, 

 a shell]. Possessing an orbital index of from 8o° to 

 85°- 

 Mesocoracoid {mes-o-kor'-ak-oid) [uiooc, midd.e ; 

 nopal-, a raven ; eldoc, form]. In comparative an- 

 atomy, situated between the hypercoracoid and the 

 hypocoracoid ; specifically an element in the shoulder- 

 girdle of certain bony fishes. 

 Mesocord (mes / -o-kord ) [fiiooc, middle ; chorda, cord]. 

 An abnormality of the umbilical cord in which, in- 

 stead of being directly inserted into the placenta, it is 

 received into a fold of the amnion arranged analogous 

 to the meso-rectum This condition does not inter- 

 fere with the health of the child. 



