Illustrated Encyclopedia of Human Anatomic Variation: Opus II: Cardiovascular System
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
Frequency of Position of Dorsal Scapular Artery as It Passes Through Brachial Plexus.
A: The dorsal scapular artery arose from the thyrocervicai trunk in 30% of cases, from the second part of the subclavian (behind the anterior scalene muscle) in 34%, and from the third part of the subclavian (lateral to the anterior scalene) in 33%. The following table (from Huelke) provides the number and frequency of occurrence of the various sites of origin of the dorsal scapular artery.
The subclavian artery is considered to be divided into three parts by the anterior scalene muscle. The segment of the artery medial to the muscle is subclavian I; the portion behind it is subclavian II, and the part of the artery lateral to the muscle is subclavian III.
B: This illustration shows the frequency of the various positions Of the dorsal scapular artery as it passes through the branching of the nerves of the brachial plexus.
|
Origin |
Number |
Percent |
|
A. From the transverse cervical artery |
54 |
30.3 |
|
B. From subclavian II |
||
|
1. Directly |
54 |
30.3 |
|
2. With the costocervical trunk |
2 |
1.1 |
|
3. With the suprascapular artery |
4 |
2.2 |
|
C. From subclavian III |
55 |
30.9 |
|
1. Directly |
||
|
2. With the costocervical trunk |
1 |
0.6 |
|
3. With the suprascapular artery |
3 |
1.7 |
|
D. Directly from: |
||
|
1. Thyrocervical trunk |
1 |
0.6 |
|
2. Subclavian I |
1 |
0.6 |
|
3. Axillary I |
2 |
1.2 |
|
4. Axillary |
1 |
0.6 |
Redrawn from Huelke, D.F. A study of the transverse cervical and dorsal scapular arteries. Anat. Rec. 132:235-245, 1958.
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