400 THE MUSCULAR SYSTEM. 
alba,.a broad interlacing band of fibres which occupies the middle line of the 
anterior abdominal wall in its whole extent, and forms the greater part of the 
ultimate insertion of the lateral abdominal muscles. 
The upper part of the aponeurosis on the chest-wall covers the rectus abdominis 
muscle, and gives origin to fibres of the pectoralis major. Below it gives rise to 
STERNO-MASTOID 
TRAPEZIUS 
PLATYSMA MYOIDES 
SUBCLAVIUS 
Coracoid 
process 
PECTORALIS 
MAJOR (divided 
DELTOID — { , 
, Clavicular 
part 
Costo-_—_7 
sternal part — || 
PECTORALIS 
MINOR 
PECTORALIS 
MAJOR (divided) 
SERRATUS 
|) MAGNUS 
Abdominal 
part 
PECTORALIS MAJOR 
SERRATUS ! 
Fi til fll) aa mA \\ \\ \) \ 
MAGNUS AV \ SS y \ \ \" | 
! AW q h \\ 1 
Sheath of rectus 
| | 
~Linew transverse ~ 
OBLIQUUS EXTERNUS 
° 
ABDOMINIS : 
Linea semilunaris 
RECLrUS ABDOMINIS Linea alba 
PYRAMIDALIS ABDOMINIS 
Poupart’s ligament 
External abdominal ring 
Triangular fascia 
Fic. 295.— ANTERIOR MUSCLES OF THE TRUNK. 
Poupart’s ligament, Gimbernat’s ligament, the external abdominal ring with its 
two pillars, the intercolumnar fascia and fibres, and the triangular fascia. 
Poupart’s ligament is an arched fascial band which extends from the anterior 
superior iliac spine to the spine of the pubis, over the iliacus, psoas, and pectineus 
muscles. It represents the lower limit of the aponeurosis of the obliquus externus 
abdominis, and gives attachment below to the fascia lata of the thigh. Its outer 
part affords partial origin to the deeper lateral muscles of the abdominal wall, 
