THE OBSERVATION OF THE SHEATH OF THE MUSCULUS RECTUS ABDOMINIS
- VernacularTitle:腹直肌鞘的观察
- Author:
Chengtsin LIU
;
Shinchen CHUNG
- Publication Type:Journal Article
- From:
Acta Anatomica Sinica
1957;0(04):-
- CountryChina
- Language:Chinese
-
Abstract:
The constitution of the sheath of the musculus rectus abdominis and the formation,numbers and position of the arcuate lines were studied in 100 Chinese adult cadavers atfive different transverse sections. In addition, the width of the linea alba was alsomeasured at four different levels. The sheath of musculus rectus consisted of different components at different levels.The typical form was found in the umbilical region. Here it was formed by the splittingof the aponeurosis of the internal oblique into an anterior and a posterior lamella; theanterior lamella forming the anterior wall of the sheath was reinforced by the apo-neurosis of the external oblique; and the posterior lamella forming the posterior wall ofthe sheath was joined with the aponeurosis of the transversus. The components of theanterior wall were found to be attenuating gradually upwards and thickening downwards,however, the reverse was seen in that of the posterior wall. The arcuate lines occured in 82.5% of the specimen, 15% showed two slips, onewas the true arcuate line and the other was the accessory arcuate line. The position ofthe arcuate line was mostly found to be located at the junction of the upper and middlethird in between the umbilicus and the upper margin of the symphysis pubis, while thatof the accessory lines was lying below the arcuate lines. It seemed that the arcuatelines were formed by the sudden terminations of the aponeurosis of the internal obliqueand the transversus muscles on to the posterior wall of the rectus sheath. The linea alba appeared to be wider above the level of the umbilicus but becamelinear below it. The widest portion was seen at the junction of the middle and lower thirdin between the xyphoid process and the umbilicus, averaging 11.9 mm.
