Infer tion. Immediately under the hyo-throideus. 3. Crico-thyroi From the anterior part and fide of Into the lower part deas the cricoid cartilage. and inferior horn of lage. Ufe. (203.) MUSCLES SITUATED AT THE BACK PART OF THE PHARYNX. . Crico-arytænoideus pofti cus. arytenoid cartilage 3. Arytenoideus obliquus. noid cartilages. the other arytenoid lages laterally. noid cartilage late- From the cricoid cartilage pofte Into the bafis of the To open the glottis, riorly. From the bafis of one of the arytæ- Near the extremity of 4. Arytenoideus From one of the arytenoid carti- Into the other arytætranfverfus. To draw the parts it is connected with towards each other. To fhut the glottis. To draw the arytæ To move the epiglot- (205.) MUSCLES AT THE FORE PART OF THE NECK, CLOSE TO THE VERTEBRÆ. 3. Pectoralis mi- From the upper edges of the 3d, Into the coracoid pro 4. Serratus mag- From the eight fuperior ribs. nus. 1. Diaphragma cefs of the scapula. Ufe. To comprefs and fupport the vifcera, affift in evacuating the fæces and urine, drawn down the ribs, and bend the trunk forwards, or obliquely to one fide. To aflift the obliquus externus. To comprefs the abdominal vifcera. To comprefs the fore part of the abdomen, and to bend the trunk forwards. To affift the lower portion of the rectus. To draw the arm forwards, or obliquely forwards. To move the clavicle forwards and downwards, and to affift in raifing the firft rib. To move the fcapula forwards and downwards, or to elevate the ribs. (208.) MUSCLES THAT CONCUR IN FORMING THE THORAX. (h). laft cervical, and the eleven upper dorfal vertebræ. berofity. 3. Intercostales From the lower edge of each upper Into the fuperior edge To elevate the ribs. rib. externi. Name. (n). 3. Latiffimus dorfi. Origin. İnfertiou. fcapula. Into the os humeri, at Use. upwards and backwards. To draw the os humeri downwards & backwards, and to roll it upon its axis. 2. Rhomboideus From the fpinous proceffes of the Into the bafis of the To move the scapula three lowermoft cervical, and of all the dorsal vertebræ. From part of the fpine of the os ilium, the fpinous procelles of the os facrum and lumbar vertebræ, and of fix or eight of the dorsal vertebræ; alfo from the four inferior falfe ribs near their cartilages. From the spinous proceffes of the two lowermoft dorfal, and of three of the lumbar vertebræ. 4. Serratus inferior pofticus. the inner edge of the Into the lower edges To draw the ribs outwards, downwards, and backwards. To move the scapula forwards and up wards. From the spinous procefs of the fe- Into the os occipitis. 11. Rectus capi- From the firft vertebra of the neck. Into the os occipitis. tis pofticus mi rax. To move the head backwards. To draw the head backwards. To draw the head backwards. To extend the head and draw it backwards. To aflift the rectus major. To draw the head backwards. To draw the face towards the fhoulder, and to move the first vertebra upon the ftcond. Into the lower edge To draw the ribs of each rib. The fame as that of the facro-lum- Into. the tranfverfe 16. Spinalis dor- From the fpinous proceffes of the uppermoft lumbar and lowermost dorfal vertebrae. proceffes of the dor- downwards, move the body upon its axis, aflift in ere&ing the trunk, and turn the neck backwards, or to one side. To stretch the vertebræ of the back, & keep the trunk erect. To extend the vertebræ. 17. Semi |