Emilio Farfán C.; Oscar Inzunza H.; Jaritza Tramolao O.; Guillermo Leyton E. & Verónica Inostroza R.

Variations of the axillary artery may have clinical implications capable of generating unexpected situations during surgical procedures of arterial reconstruction or vascular catheterization. The objective of this work was to report the finding of an anatomical variant of the axillary artery, which may have clinical and surgical implications. A descriptive study was conducted, in which a unilateral vascular variation found during a routine dissection in a right upper limb of a male cadaver was reported. From the second portion of the axillary artery originated a common arterial trunk that gave rise to the subscapular, anterior humeral circumflex, posterior humeral circumflex and deep brachial arteries. The third portion of the axillary artery did not emit branches. The common arterial trunk originated from the second portion, 62.64 mm from the beginning of the axillary artery. Its total length was 23.72 mm and its thickness was 6.1 mm. The caliber of the branches originating from the common arterial trunk was: subscapular artery 5.1 mm, anterior humeral circumflex of 1.66 mm, posterior humeral circumflex 3.18 mm and deep brachial 3.73 mm. The vascular variant detected altered the anatomical relationship of the axillary artery with the brachial plexus, generating a modification in the position of the fascicles and their terminal branches. Anatomical variations of the axillary artery are not infrequent, knowing them may be necessary during surgical procedures or anatomical dissections.

KEY WORDS: Axillary artery; Common arterial trunk; Anatomical variations.

FARFÁN, C. E.; INZUNZA, H. O.; TRAMOLAO, O. J.; LEYTON, E. G. & INOSTROZA, R. V. Common arterial trunk for the branches of the third portion of the axillary artery. Description of a case and its clinical application. Int. J. Morphol., 40(4):995-999, 2022.