Illustrated Encyclopedia of Human Anatomic Variation: Opus II: Cardiovascular System: Arteries: Upper Limb
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
The arch may be reinforced by enlarged posterior perforating branches from the radial and its branches on the back of the hand or by a large palmar interosseous.
In some cases the radial joins the deep arch by passing through the second, instead of the first interosseous space.
The princeps pollicis and radialis indicis may arise from the superficial palmar, or from a separate branch of the radial that passes through the first interosseous space.
When the radialis indicis originates from the superficial arch (13%) it is distributed to the radial side of the index finger.
The radialis indicis originates from the deep arch in 45% of cases, and the superficial arch in 13%; both arches contribute in 42%.
Of the 45% of individuals, radialis indicis and princeps pollicis arteries arise in common in 12% of cases. The princeps pollicis artery may arise from the radial artery in the palm, the superficial arch, or from a combination of both the deep and superficial arches.
The deep palmar arch is statistically less variable than the superficial palmar arch.
When absent (0.25%, Jaschtschinski), it is replaced by branches of the superficial palmar arch or by the dorsal system of arteries.
As can be readily ascertained, the arteries of the hand frequently vary from the expected or usual configuration. This occurs in two ways: 1) By far the greater number of deviations consist of a deficiency in either the radial or the ulnar system of arteries, accompanied by a corresponding increase in the other. The variation is much more commonly due to a deficiency in the superficial arteries with an increase supply from the deep set. 2) In the second and smaller group of variations a deficiency in one or another of the two systems is supplied, either by the enlargement of branches which descend in front of the limb, as the superficial volar (from the radial), or the median artery (from the anterior interosseous), or by the enlargement of an interosseous branch (from the radial) on the back of the hand.
Schaefer, et al., in Quain's Anatomy illustrated these general remarks as follows: " In the greater number of cases the superficial palmar arch is diminished, and gives off fewer digital branches than usual. Generally only one branch is wanting, viz., that which supplies the adjacent sides of the fore and middle fingers; but sometimes two or three branches are absent, or even all four, as when the ulnar artery, after giving branches to the short muscles of the little finger, ends in the deep palmar arch. In the last-mentioned case, which is rare, it is obvious that the superficial arch is altogether wanting."
"These various deficiencies in the superficial palmar arch and its branches are usually compensated by an enlargement of the deep arch, the palmar interosseous branches of which, being increased in size, divide at the clefts of the fingers, and form such collateral digital branches as are not derived from the usual source. But a defective superficial arch may, as before mentioned, be reinforced from other vessels, viz., from the superficial volar, from an enlarged median artery, or from a large dorsal interosseous branch."
"It sometimes, but less frequently, happens that the deep system of vessels is deficient, in which case the superficial arch may supply all the digital arteries to the thumb and fingers, one or more of these may be derived from the superficial volar, the median, or a dorsal interosseous artery."
"The superficial palmar arch has occasionally been seen doubled, the superficial part of the ulnar artery and the superficial volar branch of the radial being each divided into two communicating branches. Two of the digital arteries frequently arise by a common trunk." This ends the general summary from Quain's Anatomy, 1915.
A common digital artery may penetrate a proper digital nerve creating a neural loop.
Image 55B, Image 130, Image186, Image 251B, Image 252A, Image 252B, Image 252C, Image 252D, Image 252E, Image 252F, Image 252G, Image 252H, Image 252I, Image 252J, Image 263, Image 332, Image 332A
Princeps Pollicis and Radialis Indicis
Image 45B , See Images 250, 252A, 252B, 252C, 252D, 0252E, 252F, 252G, 252H, 252I, 252J
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