TACITURN 



1455 



TALIPES 



Taciturn [fas' -it-urn) [(aci(umus, silent]. Habitually 



silent or reserved. 

 Tact [takt) [(actus ; tangere, to touch]. Delicacy of dis- 

 crimination, judgment, and act. T., Medical, skill in 

 the diagnosis and treatment of disease. See Tac(us. 

 Tactile [tak'-til) [tactilis\ Pertaining to the sense of 

 touch. T. Cells, cells representing special sensory 

 nerve-endings, "found in the deeper layers of the epi- 

 dermis, or the adjacent stratum of corium. They are, 

 I) simple, oval, nucleated elements 5-12 a in size, 

 sembling ganglion-cells; (2) compound, in which 

 vo or more cells are associated to receive the nerve- 



Tactile Cells, Snout of Pig. 

 actile cells, m. Tactile disc. n. Nerve-fiber. (From 

 Stirling. ) 



the corpuscles of Grandry and of Merkel found 

 respectively in the epidermis of birds and of mammals 

 are examples of such structures" (Piersol). T. Cor- 

 puscles, special sensory nerve-endings exhibiting 

 more complexity of structure 

 than compound tactile cells. 

 Cf. End-bulbs. T. C. of 

 Grandry, see under T. Cells. 

 T. C. of Meissner, oval or 

 elliptic bodies, 45-140 u long 

 and 35-55 IJ- wide, situated 

 usually at the apices of the 

 papilla; of the corium, in the 

 skin of the palmar surfaces 

 of the ringers and toes. 

 Each corpuscle is supplied 

 with one or two, sometimes 

 three or four, medullated 

 nene-fibers. T. C. of Mer- 

 kel, see under T. Cells. T. 

 Disc, the flattened terminal 

 expansion of the axis cylin- 

 der in a special sensorv nerve- 

 ending, or tactile corpuscle. 



T. Meniscus, a peculiar N Th 



Tactile Corpuscle of 

 Meissner, from the 

 Skin of a Human Toe. 



e nerve entering the 



complicated group of tac- 

 tile cells composing the 

 corpuscle. Bl. Blood- 

 vessel accompanying the 

 nerve-fiber. (From Pier- 

 sol, after Schieffer- 

 decker.) 



crescentic expansion of 

 nerve-fiber over the ental 

 surface of a tactile cell. T. 

 Papillae. See Papilla. T. 

 Reflexes, reflex movements 

 from stimulation of the tactile 

 corpuscles. 



Tactus (tat' -tus) [(angere, to touch]. Touch. Delicacy 

 of tactile sensation. T. eruditus, or T. expertus, 

 especial sensitiveness of touch acquired by long ex- 

 perience. 



Taedium vitae ((c'-de-um vi'-(e) [L.]. Disgust, or 

 weariness of life, a symptom witnessed in many cases 

 of insanity ; it is sometimes a precursor of suicide. 



Taenia (te'-ne-ah). See Tenia. 

 ^aeniacide {(e'-ne-as-id). See Teniacide. 



Taeniafuge (te f -ne-afiij). See Teniafuge. 



Taenidium \te-nid' -e-um) [raivia, a band, fillet : //. , 

 T<znidia~\. In biology, the spiral thread of the respi- 

 ratory tracheae of an insect. 



Tafia (taf'-e-ah or (a-fe'-ah) [Malay, tafia, rum]. Rum. 



Tag Alder (tag' awl'-der). See Alnus. 



Tagliacotian {lal-e-ak-o' -she-an) [after Tagliacozzi, an 

 Italian surgeon]. Pertaining to Tagliacozzi. T. 

 Operation, a rhinoplastic operation by which, in case 

 of destruction of the natural tissue, a part or the whole 

 of a new nose is formed by a flap from the forehead 

 or other part. 



Tagma \(ag f -mah) [ray/xa, that which has been ordered 

 or arranged]. In biology, a general term applied by 

 Pfeiffer to all aggregates of molecules. Cf. Inotagmata 

 micella, pleon, syntagma. 



Tail ((dl) [ME. , (ail, tail]. The caudal extremity of an 

 animal. Applied to tail-like parts of an organ of the 

 human body; e.g., the tail of the epididymis or of 

 the pancreas. T.-coverts, the most posterior feathers 

 of the body of a bird, or those which immediately 

 cover the basal portion of the tail. T.-fold, an em- 

 bryonic infolding or hollow, enclosing the hind-gut. 

 See Head-fold. 



Tailors' Cramp or Spasm. See Cramp. T.s' Muscle. 

 See Sarlorius (in Muscles, Table of). 



Taint (tdnt) [ME., teint, taint]. An infection, or 

 pathogenic influence; as a syphilitic taint. A spot 

 or blemish. 



Tait's Knot. A peculiar method of ligating the 

 pedicle in the operation of ovariotomy. See Kno(, 

 S(afferdshire . T.'s Law. See Law. T.'s Method. 

 See Perineorrhaphy . 



Talalgia ( tal- al'-je - ah) [talus, heel; a/.}oc, pain]. 

 Pain in the heel. 



Talc, Talcum {(alk) [gen., Talci\ A silicate of mag- 

 nesium, a white, unctuous, neutral powder; sometimes 

 used in insufflating-powders, and as a remedy in 

 diarrhea. 



Taliacotian {(al-e-ak-o' -she-an) . See Tagliacotian. 



Taliped {(al'-ip-ed) [(alus, ankle; pes, foot]. A 

 person affected with talipes ; club-footed. 



Talipedic {(al-ip-e'-dik) [(alus, ankle ; pes, foot]. Be- 

 longing or relating to talipes. 



Talipes {(al'-ip-ez) [(alus, ankle ; pes, foot] . The 

 deformity commonly called club-foot, depending upon 



Talipes Equinus. 



Talipes Calca- 



NEOUS. 



Talipes Cavus or 

 Arcuatus. 



Talipes Varus. 



Talipes Equino- 

 varus. 



Talipes Calcaneo- 



VARLS. 



contraction of muscles or tendons, either congenital or 



