432 



APPLIED ANATOMY. 



THE PELVIS. 



The pelvis is composed of the two innominate bones, the sacrum, and the coccyx. 

 It is constructed with a view to connecting the lower extremities with the trunk, to 

 support the weight of the trunk and to promote locomotion, to act as a receptacle 

 and protector of the pelvic viscera and to fulfil the function of parturition. 



In infancy locomotion and parturition are in abeyance, hence the pelvis is un- 



Erector spinae 

 Quadratus lumborum | Latissimus dorsi 



Transversalis 



Obliquus internus 

 Obliquus externus 



Iliacus 



Anterior superior spine 

 Sartorius 



Anterior inferior spine 

 Rectus femoris 



Pyriformus 



Acetabulum 



Iliopectineal line 



Pectineu; 



Obturator externus 

 Adductor magnus 



FIG. 438. The male pelvis, front view. 



.evator am 

 Pyramidalis 

 Crest of pubis 



Rectus abdominis 

 Spine of pubis 

 Adductor longus 

 Adductor brevis 

 Gracilis 



developed, the bladder and uterus are almost entirely in the abdomen, and the 

 rectum is almost straight. As the child begins to use its lower limbs for locomotion 

 the pelvis increases progressively with the growth of the lower extremities, and with 

 the advent of puberty its development is completed. The structure of the pelvis in 



Quadratus lumborum Latissimus dorsi 



Gluteus medius 

 Gluteus maximus 



Gluteus minimus 

 Tensor fascis femoris 



Erector spina- 

 Reflected tendon of rectus- 



Gluteus maximus 



Gemelli 

 Semi membranosus 



Biceps and semitendinosut 



Obturator internus 



osterior superior spine 



Posterior inferior spine 



Spine of ischium 



Tuberosity of ischium 



Levator ani 



FIG. 439. The male pelvis, back view. 



relation to the function of locomotion will be considered later in connection with the 

 pelvic girdle and lower extremity ; here we will consider it in relation to the pelvic 

 viscera and their functions. 



That part of the pelvis above the iliopectineal line has been called the false 

 Pelvis, while that below is the tme pelvis. The inlet of the pelvis is formed anteriorly 

 by the crest and spine of the pubes, the iliopectineal lines on the sides, and the base 



