260 



THE VASCULAR SYSTEM. 



H 



(4) The tibio-femoral septum [Septum femoro-crurale) is a circular 

 band, separating" the lymph-sacs of the thigh from the leg" sac. 



(5) The septa of the foot. At the ankle joint the skin is closely 

 attached all round to the underlying- parts. Along- the outer border 

 of the foot a septum is attached to the skin externally, and to the 

 underlying" parts, especially the M. ahductor longus digitl jmu/i, 

 internally. A similar but weaker band is attached along the outer 

 border of the foot, especially to the 31. adductor diglti quinti. 



b. The lymph-sacs. 



(i) The femoral lymph-sac [Sacctis femoralis), (Figs. 169, 170, 

 171, 175 9) covers the lower and outer surfaces of the thigh ; it is 



bounded by the suj)erior femoral and 

 inferior femoral sej^ta, and in front 

 by the inguinal septum. 



(2) The suprafemoral lymph-sac 

 [Saccus sujyrafemoralis), (Figs. 169, 

 171, 175 10) lies on the uj)per sur- 

 face of the thigh, between the 

 superior and intermediate femoral 

 septa ; above it is bounded by the 

 inguinal septum. 



(3) The interfemoral lymph-sac 

 [Sacc7(s interfemoralis), (Figs. 169, 

 170, 175 11) is a narrow sac on the 

 inner svirface of the thigh, between 

 the inferior femoral septum and the 

 intermediate femoral septum. It 

 covers the M. rectus intérims minor, 



and is interrupted by numerous bands of tissue which pass from the 

 surface of the muscle to the skin. It is, therefore, not a simple sac, 

 but a very wide-meshed trabecular struature of connective-tissue. 

 The sac is triang-ular in shape, with the base directed forwards at 

 the inguinal septum. 



(4) The lymph- sac of the leg is a simple sac enclosing the 

 whole leg, bounded above by the tibio-femoral septum, and below by 

 the attachment of the skin to the ankle. 



(5) The lymph-sacs of the foot. On the dorsum of the foot the 

 skin is free, and there is consequently a lymph-sac. On the plantar 

 surface the skin is attached by numerous connective-tissue bands 

 and thread-like tendons, particularly to the flexor tendons. The 



Transverse section of the thigh . 



h M. biceps. 



/' Superior femoral septum. 



/•'' Inferior femoral septum. 



f-' Intermediate femoral septum . 



H Skin. 



rV M. rectus internus major. 



ri'" M. rectus internus minor. 



* M. Sartorius. 



sm M. semimembranosus. 



ve M. vastus externus. 



9 Femoral lymph-sac. 



10 Suprafemoral lymph-sac. 



11 Interfemoi'al lymph-sac. 



