An abnormal relation of the iliac artery to the sciatic plexus in the frog

✍ Scribed by Pinney, Edith

• Publisher: John Wiley and Sons
• Year: 1924
• Tongue: English
• Weight: 69 KB
• Volume: 28
• Category: Article
• ISSN: 0003-276X
• DOI: 10.1002/ar.1090280508

✦ Synopsis

Normally, in the frog the iliac arteries lie ventral to the tenth spinal nerve and dorsal to the nerves of the sciatic plexus. The accompanying figure shows a variation from this relation between the iliac artery and the sciatic plexus of the left side. Here the artery continues ventrally to the plexus from the tenth nerve, but soon turns and reaches its dorsal position by piercing the ninth nerve.

The arrangement here recalls the way in which the lateral head of the ulnar nerve pierces the medial head of the median nerve in man, although there the relation is between nerve and nerve, and not between nerve and blood vessel as in this instance.l Probably the developmental mechanics giving this result are the same in each case, being in man a normal occurrence, while the condition described here for the frog has not been observed before as far as the writer knows.

This frog was one of many used in class work in general zoology. Unfortunately, nothing was known of its behavior. The hind legs were normal and of equal size, and it seems