166 ANATOMY OF THE RABBIT. 
tremity—is divisible into proximal, middle and distal segments. 
The proximal segment contains a single element, the femur; the 
middle segment two elements, the tibia and fibula, which, how- 
ever, are extensively coalesced; 
and the distal segment twenty- 
three elements, of which six 
form the tarsus, five the meta- 
tarsus, and twelve the pha- 
langes. 
THE COXAL BONE. 
The coxal bone (os coxae) 
(Fig. 69) is a somewhat trira- 
diate structure, the posterior 
limbs of which are united, so 
that they enclose a large aper- 
ture, the obturator foramen 
(foramen obturatum). It is 
firmly articulated with the 
sacrum, and is united with its 
fellow of the opposite side by a 
thin strip of cartilage containing 
a small amount of fibrous 
material. The latter connec- 
tion is the pubic symphysis 
(symphysis pubis), better term- 

FIG. 60. Lateral surface of the left 
coxal bone: IL, ilium; IS, ischium; P, ed in the rabbit the pelvic 
pubis; a., acetabulum; a.i., iliac wing; ° 5 é : - 
c.l., body of ilium; c.is., body of ischium; symphysis, since it 1S some- 
c.p., body of pubis; cr., iliac crest; e.i., . 
iliopectineal eminence; f.a., acetabular what more extensive than the 
fossa; f.0., obturator foramen;  -a., 5 : 5 
acetabular notch; i.mi., lesser ’ sciatic corresponding articulation of 
notch; i.mj., greater sciatic notch; 1.1., 5 
iliopectineal line; p.l., lateral process of the human pelvis. 
ischial tuberosity; r.i.i., inferior ramus of 5 
ischium; r.i.p., inferior ramus of pubis; In the young animal each 
r.s.il., SUperior ramus of ischium; r.s.p., i 5 5 
superior ramus of pubis; s.a.i., inferior half of the pelvis consists of 
anterior spine of the ilium; s.a.s., superior 
anterior spine; s.i., ischial spine;  s.p., three elements, namely, the 
symphysis pubis; s.p.i., inferior posterior 
spine; t.i., ischial tuberosity; t.p., pubic ilium, ischium, and pubis. : 
tubercle. 
They form the three rays of the 
coxal bone, and are united with one another in the region of the 
