290 Rey. 8. Haughton on the Muscular 
belonging to the various muscles thus mark out fixed lines 
round which the planes of muscular momentum must turn in 
every conceivable position of the joint. 
If we compare together the positions of these fixed lines in 
the pelvic and scapular joints, we may readily obtain relations 
between the muscles of the hind and fore limb that would 
escape notice unless so examined, and which seem to possess 
much interest. | 
Let us commence with the pelvic joint (Pl. X. fig. 1), and 
take for the zero of our circle described round the centre of the 
joint the plane of the rectus femoris, tensor vagine femoris, 
and sartorius, which corresponds with the plane of flexion of 
the: knee-joint. 
Following from right to left (on left side of pelvis) the order 
of muscles, we obtain the following table :— 
Pelvic Joint. . 
Weight. Azimuth. 
Sartorius 
As Bectus femora: = § oo ee 1:25 oz. ge 
Tensor vaginee femoris 
; { a g i cals Wh ERGO We LUG nat 4°87 oz. 23° 
iacus 
Marsupialis externus : = 
| Marerviabadnitennn Suswek eee 16402 45 
Gracilis 
A: «\Pectineda 2c. A 3°22 02. 106° 
Adductor brevis 23 
Adductor magnus ° 
s | rp aae apa } BO nhs 1:79 of, DB 
6: Obturator externus .............. 0:97 oz. 149° 
~ { Quadratus femoris 
be | Extensor femoris Laity} PASS ere th hme 16 30 OZ. 194 
Biceps femoris 
8. Semitendinosus | Mikes tes Ghee. is 4°49 oz. Fiz" 
Semimembranosus 
Glutzus maximus . 
0. 4 Gluteous medias 4 85 i oe 4-09 oz. 266° 
Agitator caudee ness 
Total. . 38°62 oz. ay. 
In the preceding table I have reckoned gracilis in the same 
azimuth with pectineus and adductor brevis, because the re- 
sultant of its two heads lies in this line. 
The fixed lines of the muscles of the shoulder-joint, com- 
mencing with the triceps longus, which is in the plane of 
motion of the elbow-joint, from left to right (on left side of 
shoulder), may be arranged as follows :— 
