LARYNGO-TRACHEAL 



661 



I. A I i RAL 



Laryngotracheal [lar-in' '-go-tra' '-ke-al) [lapvyt;, lar- 

 ynx; Tpaxela, the windpipe]. Pertaining conjointly 



to the larynx and tin- trachea. 



Laryngotracheitis {lar-in pw tra-ke-i f -tis) [>"/<''. i', lar- 

 ynx; rpa%eiv, windpipe; tnf, inflammation]. Inflam- 

 mation of the larynx and the trachea. 



Laryngotracheopyra [lar-in-go tra ke op / -ir-aA), Sy- 

 nonym of Croup. 



Laryngotracheotomy [lar-in-go-tra- ke-ot'-o-me) \%ap- 

 /'•-.larynx; rpa%e la, windpipe ; Top.ii, cutting]. That 

 form of the operation of tracheotomy in which the 



cricoid cartilage, and ■ or more of the upper rings 



of the trachea arc- divided. 



Laryngo-typhoid [lar-in' '-go-H' '-J 'aid) , Laryngoty- 

 phus {Jar-in* -go-ti'-f us) [papvyg, larynx; ri 

 smoke]. I'yphoid fever associated with marked laryn- 

 geal complications. 



Larynx [lar'-inks) \7vapvyt-, larynx]. The upper part 

 of the air passage between the trachea and the base 

 of the tongue. It comprises three single cartilages, the 



th.-hyoid 

 M. st. th. 



trach. 



Larynx, Front View, Showing the Ligaments and 

 Insertion of Muscles. 

 O.h. Os hyoides. C. th. Thyroid cartilage. Corp.trit. Cor- 

 pus triticeum, or lesser cornu of tliehyoid bone. C.c. Cricoid 

 cartilage. C. tr. Tracheal i artilage. Lig. thyr -hyoid med. 

 Middle thyro-hyoid ligament. Lig. th.-h. lot. Lateral thyro- 

 hyoid ligament. Lig. cric-.-thyr. med. Middle crico-thyroid 

 ligament. Lig. eric -trach Crico-tracheal ligament. M.st-h. 

 Sterno-hyoid muscle. M. th.-hyoid. Thyro-hyoid muscle. 

 M. st.-th. Sterno-thyroid muscle. M. cr.-th. Crico-thyroid 

 muscle. 



thyroid, the cricoid, and the epiglottis, and three pairs 

 of cartilages, the arytenoids and those of Santorini and 

 Wrisberg. It is lined by an extremely sensitive mucosa, 

 which is thrown into two transverse, lipped folds that 

 constitute the vocal bands. 



Lascivious [las-it/ -e-us) [lascivia, wantonness]. Li- 

 bidinous. Wanton. Having an unlawful desire. 



Laser (la'-scr) [L.]. I. A gum-resin highly prized by 

 the ancients ; probably the same as Asadulcis, q. v. 

 2. The resin of Laserpitium latifoliutn. Unof. 



Laser, Bacillus of. See Bacteria, Synonymatic Tabic 

 of 



Laserpitium [las-er-pish' -e-ttm) [I-]- A genus of res- 

 inous and umbelliferous old-world herbs, various spe- 



- of which have been employed in medicine. L. 

 latifolium, or laserwort, i- tonic and stimulant; its 

 root abounds in a cathartic gum-resin. Unof. 



Lash [ME., la he, the Sexible end of a whip]. An 

 eye lash, 



Lassaigne's Test. See Semen and Tests, Table of. 



Lassar's Paste. A iia.--teu-.eil in tin- treatment of ery- 

 ma intertrigo. It consists of salicylic acid 30 

 grain-, oxid of zinc and powdered starch each 6 

 drams, vaselin _' ounces. This is spread over the 

 involved area. It is curative and affords protection 

 from discharges. 



Lassitude {las' -it-iid) \lassitudo ; lassus, tired]. A 

 exhaustion or weakness, arising from causes 

 Other than fatigue. 



Lasso-cell. < >ne of the peculiar filiferous cell like 

 structures of celenterates, having the power <>\ throw- 

 ing out withgreat rapidity the contained thread, which 

 produces a stinging sensation when brought in contact 

 with the skin ; a nettling cell ; an urticating 01 



Lata, or Latah {la' -tali) [Jav.]. An hysl urosis 



locally prevalent in Java, nearly identical with the 

 disorder of the jumpers in Maine and < anada, and 

 with the myriachit of Siberia. The will and the 

 motor center.-, appear to lack coordination, and the 

 patient becomes to some extent obedient to the will of 

 others, in spite of his own volitions. See Palmus 

 and Chorea, Automatic. 



Latebra [lat f -eb-rah) [/atebra.n hiding-]. lace : //., I.at- 

 ebrie~\. In biology, the central space of the food-yolk 

 of a meroblastic ovum. 



Latebricole [lat-eb* '-rik-ol) [latebra, a hiding-place; 

 colore, to dwell]. In biology, inhabiting a hiding- 

 place, as certain spiders, crabs, etc. 



Latency (/a' -tense) [latere, to be hid]. The condition 

 of being latent or concealed. 



Latent (la'-tcnt) [latere, to be hid]. Concealed. Not 

 manifest. In physics, applied to heat that apparently 

 disappears when a liquid is vaporized or a solid melted. 

 L. Period, the time required for the incubation of a 

 disease. L. Squint. See Insufficiency. 



Laterad [lat'-er-ad) \_latus, the side ; ad, to]. Toward 

 the lateral aspect. 



Lateral \lat f -er-al) [lateralis, belonging to the side]. 

 At, belonging to, or pertaining to the side. Situated on 

 either side of the median vertical plane. See /' 

 and Direction, 7 able of. L. Column, that column of 

 the spinal cord between the ventral and dorsolateral 

 fissures. L. Ginglymus, an articulation in which a 

 pivot turns within a ring or a ring around a pivot. L. 

 Laparo-nephrectomy, Langenbuch's operation. See 

 Operations, Table of. L. Line, in biology, a very 

 delicate organ of sense, usually tubular, that runs 

 along each side of almost all fishes. According to 

 M. de Sede. it is sensitive to the faintest movements 

 of the water, giving the fish continual information 

 as to the state of the medium in which it lives. L. 

 Operation, that form of operation in lithotomy in 

 which the opening is made on the right or left side of 

 the perineum. L. Organs. See Organs. L. Plates, 

 the part of the mesoblast lying external to the pro- 

 vertebra.'. L. Sclerosis, Amyotrophic, a disease of 

 the lateral columns and anterior gray matter of the cord. 

 It is characterized by motor weakness and a spa-tic con- 

 dition of the limbs, associated with atrophy of the 

 muscles and final involvement of the nuclei in the 

 medulla oblongata. The cause is unknown, and death 

 may result in from two to three years. L. Sclerosis, 

 Primary, Spasmodic Tabes dorsalis ; Spasmodic Spinal 

 Paralysis : Spastic Paraplegia : a sclerotic disease of 

 the crossed pyramidal tracts of the cord characterized 

 by paralysis of the limbs, with rigidity, increased 



