ARTERIES OF HUMAN LOWER EXTREMITY 15 
municating branch which foreshadows the development of the 
future a. peronaea. : 
- The communicating branch in question leaves the a. peronaea 
posterior superficialis at the proximal border of the m. flexor 
hallucis longus. It passes distally between the mm. flexor 
hallucis longus and tibialis posterior to join the a. interossea, 
t.p., Mm. tp, m. 
a |||, Fe) 
5 
Fig. 7 Indicates the course of three arteries of the embryonic lower extremity, 
represented diagrammatically as they would appear if persisting in the adult. 
The vessels which normally persist are indicated by shading. A, A. poplitea 
profunda and a. interossea. B. A. peronaea posterior superficialis. d. 1. m. 
flexor digitorum longus; h. l., m. flexor hallucis longus; t. p., m. tibialis posterior. 
as that artery lies upon the interosseous membrane. It may be 
called the r. communicans inferius. 
The entire r. communicans inferius persists in the adult as 
the portion of the a. peronaea which lies between the mm. flexor 
hallucis longus and tibialis posterior. The portions of the aa. 
peronaea posterior superficialis and interossea with which the 
