ANATOMY AND PHYSIOLOGY 



OUTLET 



Antero-posterior 95-12 cm. 



(Symphysis to tip of coccyx.) 

 Transverse 1 1 cm. 



(Between tuberosities.) 



P. LAC. it S.SAL. 



FIG. 47. THE PELVIS. INLET, OR SUPERIOR STRAIT. (Sappey.) 



i, Iliac fossa; 2, crest of ilium; 3, anterior-superior spine of ilium; 4, anterior- 

 inferior spine of ilium; 5, ilip-pectineal joint; 6, 7, body and symphysis of pubes; 

 8, acetabulum; 9, tuber of ischium; 10, u, pubic arch; 12, spines of ischia; 13, 

 coccyx; 14, sacroiliac joint; 15, is placed just above the promontory. 



The nucleus for the ilium appears 

 early in the second month. 



The nucleus for the pubis appears 

 about the end of the fourth month 



The nucleus for the ischium appears 

 in the third month 



FIG. 48. THE PELVIS OF A FETUS AT BIRTH, TO SHOW THE THREE PORTIONS OF 

 THE COXAL BONES. (Morris.) 



THE DORSAL AND VENTRAL CAVITIES OF THE BODY 



By articulation of the bones of the head and trunk a framework 

 is formed for two cavities, within which are situated the internal 

 organs or viscera. (These delicate and important parts must be 

 provided with surrounding structures which insure both their 

 safety and efficiency.) 



