Show UNIVERSITY LEITUUK 111 I UItlDi DUiiisHS 113 MtcJuliltu ol Ilio Human Cody 1 Tho Mechanism of the Unman 11 Jdj was the subject treated at the University public lecture last evening The lecturer was Dr C A JWLltlng and a good sized audience listened lo his Interesting treatment of the subject sub-ject 01fbo The factors for next Tuesday night t Is I How the body Is supported to be given by the same lecturer Dr Whiting The discourse given last I evening Wits Illustrated throughout by allele tons bones models and blackboard drawings and below we present a lyuupsls of some of the principal sub jecls treated The skeleton begins In the form of cartilage Cartilages may be divided Into two classes temporary and per moment The permanent cartilage remains re-mains carlllagmoui during ties while Ibo temporary cartilage sooner or later becomes oUllled or bonyi Theo Ier moment cartilages consist of three well marked varlellesthe hyaline cartilage tho white fibrous cartilage and Ibo yellow elaitlo cartilage Tho hyi line cartilage closely resembles and rorblp Is I just the terms as the temporary cartilage It consists of tells separated from each other by D secretion from the cell known as the matrix of the cartilage The white fibrous cartilage and the yellow fibrous cartilage as are Indicated by their namea are fibrous In character con sitting of threads running nearly or quite parallel to each other and of Liar lug In the fact that the white cartilage Inelastic while the yellow cartilage la highly elastic These last two varl lies of cartilage are found around tbe joints solving ligaments binding one ton to another Not alone do these cartilages bind the bono toesch other but by refining pads between Ibe bouts they Increase the pliability ol tho limb Thus the knee Joint Is a perfect sample of a hinge joint and so far 01 the bone fire concerned the only motion permitted Is a backward and and forward motion but owing to the cartilaginous pad between tbe bones a somewhat lateral motion U permitted While mot 01 the homes 01 the Lady begin so cartilages Ibro oro 10m ul the bouts 01 ilia body particularly those of the skull wretch begin no membranes and art known as weal braoou bone In mtraJIs Incll n from tile true cartilaginous bones Covering the bones Is I a membraue known as the pcrlctteurn which Is I de velood from the membrane kuow as tbe lcrlohoUrJunl Willons envelopes Ibe cartilage The bony thsue begins not only lu the calls of the cartllake tut also In Ibo perlcbondrlum eo tl at the bone In its development eisilnet from the con t or out as will as from the surface towards tbo center Hones are freely rerincated by b ood veteelr lymt hallo and nerves The IU OIl prmallnt tb bon UIO knoWI > as hvrlan cnnnl and In coot ot those cadets are found a nerve artery and velulkswollasalymphatluvkth Tbloog Lone artstUbUlaroji4rub the abaft or the middle part of Ihr bone li concerned but In the ends near tbe Joints are flllod with a spong eubstancu known ptt cancellated bout The tuba of Ibe LOll Is filled with a fitly substance known aa the yeiijw f r ut rr bl ea 2 marrow wule the caucelloui matter t brutsou ill putI 16 ho Willi Pill stance known ns the red i mrrow The yellow marrow serves clilelly a a source of nutriment to tile bed of the ioue while there Is Much ron for he belief thai some If nut all ol 1 tile red blood corpuscles are developed lu I tbo rod marrow It may not beun loterllog to know that the best skate Iou are Prepared from bodies ol patients who die from drops a dl > eatoj during the course of which tbo yellow marrow largely disappears Irom I tbo bones and the banes be OL thus freed from fat arc more easily bleached Bones are united with each other lu two principal ways First lij the edge coming togttt er forming an Inmovable I Joint Biuh joints are found iinltlnr tho bones of Ibo skull 1 The other class ol Joints known no movesblr joints Ibis may divided Into hinge Joints represented tij the elbow 1 el-bow and knee pivot Joint repieieuled by lie I aitlculatl u of the > head with the vdlhral I column and also by tile radius bono with the umerus bone at the elbow plaulfoim Joints I represented by the joints of the lingers ball and socket jai ts represented by the Britoil Allen I ul Ibo arm at tho shoulder and tbo femural bon at the bllnnd mixed Joints represented by tbe joints between be-tWeen the vertebrae The thorax Is that part ot Ibo body bounded on the sides nnd front by tbo ribs In tbe rear by the vertebral column and reaching from the neck to the abdomen from winch It It separated by the membranous parti lion known as Ibo diaphragm II Is I owing to the peculiar structure ol Ibo thorax that respiration Is possible Within the cavity of too thorax are found the heart and lungs Ibo rIb when trio thorax to at Us imalleit point downwards but by moo 01 muscular action they may be brought nearly at right augloa with tbo spinal column thus enlarging the cavity of the thorax from the rear to the front At the same time that the ribs are thus brought forward the diaphragm II f forced down thus enlarging the thorax longitudinally I As the walls of the thorax are rigid atmospheric pressure Is I unable to I cause any compression still Oil 1 1 the vacuum formed Ly the Irllod thorax eo air jnsus Into Ilia lungs throi b the mouth and nostrils The act of air passing Into the lunge Is I known aa Inspiration while tbe process pro-cess by which the ribs fall to their former for-mer position and the diaphragm rise thus diminishing the size of tile thorax la I known as the process of expiration The two combined result lu what 10 known as respiration Pervading every part of the body Is I a web of matter known as connective tissue Connective tissue Is I not confined con-fined to the fleshy part 01 the body but entends through the bno as well Ho thoroughly is I the body permeated ty connective tissue that If all the other parts might be dissolve away the connective tissue would not only retain the outline of the body Itself but 01 every organ In It The connective Wants consists very largely ol while and yellow carlllagluous fibers pleutl fully mixed with nerves and blood Yes sets |