Volume 13, Issue 4 (Autumn 2016 -- 2016)                   ASJ 2016, 13(4): 203-206 | Back to browse issues page

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Babaee S, Baazm M, Bayat P, Sakhaie M H, bayat M. Case Report: A Rare Variation in Origin of Common Interosseous Artery: A Review of Anatomical Studies and Case Report. ASJ. 2016; 13 (4) :203-206
URL: http://anatomyjournal.ir/article-1-182-en.html
1- Department of Anatomy, School of Medicine, Arak University of Medical Sciences, Arak, Iran
2- Department of Anatomy, School of Medicine, Arak University of Medical Sciences, Arak, Iran.
3- PhD Department of Anatomy, School of Medicine, Arak University of Medical Sciences, Arak, Iran.
4- Department of Anatomy, Arak University of Medical School, Arak, Iran
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1. Introduction
Anatomists and surgeons noticed the variations of origin and course of the principal arteries in the upper extremities. The prevalence of unusual path of arteries in upper limb were reported around 18% [1]. Normally, the ulnar artery is the greater terminal branches of brachial artery. It starts at the cubital fossa against radial tuberosity and leaves the fossa by passing deep to heads of the pronator teres muscle. It runs along the medial border of the forearm and lateral side of the ulnar nerve and enters the palm by passing superficial to the flexor retinaculum. Normally, common interosseous artery is a short branch of the proximal part of ulnar artery [2, 3]. It descends on interosseous membrane, dividing to anterior and posterior interosseous arteries. These branches supply anterior and posterior aspects of forearm. The other branches of ulnar artery, anterior and posterior ulnar recurrent, contributes to anastomotic network of vessels around the elbow joint [4].
2. Case Report
During educational dissection of a 37-year-old male cadaver, some variations in the right upper limb, including the origin of the common interosseous artery (Figure 1), superficial route of ulnar artery, and anterior and posterior ulnar recurrent were observed (Figure 2). 

In the present case also the caliber of radial artery was larger than that of ulnar artery. On the left side, there was not any variation in route of arteries. The short trunk of the common interosseous artery directly separated from radial artery 5.5 cm below the elbow joint. Immediately it divided into the anterior and posterior interosseous arteries. Posterior interosseous artery passed backward through interosseous membrane to posterior aspect of forearm. The anterior interosseous artery descended deeply on interosseous membrane, overlapped by contiguous sides of flexor digitorum profoundus and flexor pollicis longus and supplied deep anatomical elements. Ulnar artery had superficial course and traversed on pronator teres and flexor digitorum superficialis muscles under the cover of skin and superficial fascia (Figure 1). The course of an ulnar artery over the forearm flexor muscles was previously reported by Natsis et al [5]. The ulnar artery finally passed down over the front of the wrist in to the palm. 
3. Discussion 
Variations in the pattern of upper limb arteries explored mostly during anatomical dissection, angiographic studies, or incidentally during surgery, are a potential source of pitfalls and difficulties in medical practices. However, the knowledge does not clearly explain how or when these variations arise during the development. The prevalence of variation in upper extremity vessels is about 9% to 18.5% [1, 6]. These variations can be explained as failure in normal embryologic development of the upper limb vascular plexus [7]. Rodriguez et al. believed that the pattern of variations arise through the persistence, enlargement, and differentiation of parts of the initial network, which would normally remain as capillaries or even regression [8]. 
Several reports described the variations in the arterial plexus of the upper limb and hand [1, 6, 9]. Bilodi et al. reported the variation in right upper limb, the brachial artery terminated into ulnar and radial arteries [10], and the common interosseous arteries arising from the radial artery, but not from ulnar artery [11]. Similar cases were reported in other literature [12, 13].The axial artery in the developing limb bud includes both subclavian and axillary arteries. The origin of anomalies in the branching pattern of the upper limb buds is attributed to the defects in the embryonic development (sprouting and regression) of vascular plexus [14]. 
Development of vasculature pattern of upper limb takes place by a complex process. Some studies suggest that arterial pattern development in the forearm occurs following the initial capillary plexus with an anterior-posterior polarity due growth, enlargement, and differentiation of certain capillary vessels, and the regression of others [8]. In the current study, a common interosseous artery was observed as one of the main proximal branches of radial artery (Figure 1). The pattern suggested in the present study may be related to regression through origin of radial artery to lower place than that of normal position raised by Singer in the stage 5 of developmental pattern of arterial plexus in upper limb [15]. 
In agreement with the results of the current study, some studies reported the origin of common interosseous artery from radial artery [14, 16]. It may also originate from axillary or brachial artery. Previous studies showed the high origin of radial and common interosseous arteries [17]. A superficial course of ulnar artery under the antebrachial fascia was observed in the current case report. The incidence rate of superficial ulnar artery was reported in 2% of the cases [18]. Mehta et al. reported a case of an anomaly in the ulnar artery. It traversed superficially on the muscles of ulnar side of forearm and continued to be in the same plane in the forearm as well [11]. The presence of a superficial ulnar artery may be due to developmental arrest of arterial network, limb development, and genetic factors also may be related to the predominance of hemodynamic factors at the origin of the ulnar artery [19-21]. 
Another variation in the current study was the origin of anterior and posterior ulnar recurrent arteries that originated separately from common interosseous artery. Similar to the results of the current study, Babu reported the origin of anterior and posterior ulnar recurrent by a common trunk from common interosseous artery [14]. In a study on the incidence of superficial route of upper limb arteries, D’Costa et al. reported the origin of anterior and posterior ulnar recurrent originated from common interosseous artery [22]. The mechanisms of change in route of this arterial variation are unknown. It may be due to alteration in origin, differentiation, and the hemodynamics of vascular plexus.
4. Conclusion
The study suggested that giving off the common interosseous artery from radial artery in upper limb occurred during the first stage of embryological patterns of upper limb arterial system. The proximal attachment of radial artery was regressed in the 5 stage, but the origin of this artery takes place below the classic place. Finally, the study suggests physicians to consider routine imaging examinations for patients before performing any surgical procedures. 
The current research did not receive any financial support. Authors wish to thank Mr. Shakeri for cooperation with the study.
Conflict of Interest
Authors declared no conflicts of interest.

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Type of Study: Original |
Received: 2016/05/21 | Accepted: 2016/09/1 | Published: 2016/11/1

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