Pectoralis quartus originated from lower ribs, lateral border of pectoralis major or rectus sheath and inserted into bicipital groove or fascia of upper arm. Pectoralis tertius originated from the lower ribs and inserted into humerus or coracoid process. Pectoralis intermedius originated from third and fourth ribs between pectoralis major and minor, and inserted onto coracoid process. Pectoralis minimus originated from first or second rib and inserted onto coracoid process. The variants of these accessory muscles previously documented include pectoralis minimus, pectoralis intermedius, pectoralis tertius and pectoralis quartus. IntroductionĪccessory muscle of pectoral region intervening between the pectoralis major and minor have been reported in humans. KeywordsĪccessory muscle Pectoralis minor Pectoralis quartus Pectoralis tertius Variant pectoral muscle. The knowledge of these variants is important to clinicians in procedures involving pectoral and axillary region. Both inserted onto the fascia over coracobrachialis. The pectoralis minor originated from 2 nd to 5 th ribs. On the left side the intermediate pectoralis muscle originated from 6 th rib, external oblique aponeurosis, fascia over rectus sheath. Both intermediate pectoralis muscle and pectoralis minor inserted onto coracoid process as well as capsule of the glenohumeral joint. The right pectoralis minor originated from 3 rd to 5 th ribs. On right side the origin of intermediate pectoralis muscle was from 4 th rib, 5 th rib and external oblique aponeurosis. We report a rare case of bilateral variant insertion of pectoralis minor associated with intermediate pectoralis muscle in a female cadaver. Intermediate pectoralis muscle is an accessory muscle that intervenes between pectoralis major and minor. Pectoralis minor is a triangular muscle situated in upper chest deep to pectoralis major.
CORACOID PROCESS 3 MUSCLES LICENSE
This open-access article is distributed under the terms of the Creative Commons Attribution Non-Commercial License (CC BY-NC) (), which permits reuse, distribution and reproduction of the article, provided that the original work is properly cited and the reuse is restricted to noncommercial purposes. Unusual concurrence of intermediate pectoralis muscle and variant insertion of pectoralis minor with its clinical aspects.
Jawaharlal Institute of Postgraduate Medical Education and Research,Ĭitation: Vani PC, Anbalagan J, Rajasekar SS.
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