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The Pectoral-Sternalis Complex: an Unusual Case Report

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The Pectoral-Sternalis Complex: an Unusual Case Report Case Report http://dx.doi.org/10.4322/jms.64113 The pectoral-sternalis complex: an unusual case report BALA, M.1*, PASSI, D. K.2 and KAUSHAL, S.3 1Medical college Mullana, Ambala. Haryana. India (Anatomy), Ambala – Índia 2Civil Hospital, Samana, Patiala (Civil Hospital, Samana, Patiala), 147101 Patiala – Índia 3Govt. Medical College, Patiala (Govt. Medical College, Patiala), 147001 Patiala – Índia *e-mail: [email protected] Abstract A unilateral absence of sternocostal fibers of pectoralis major muscle with unilateral presence of sternalis muscle has been noticed in right side of an adult male cadaver during routine dissection. All slips of pectoralis major muscle as well sternalis muscle innervated by medial and lateral pectoral nerves. Absence of pectoralis major has been described extensively, both as an isolated anomaly, with varying levels of hypoplasia, and in association with congenital syndromes. But the partial hypoplasia of pectoralis muscle with compensatory presence of one of the rare muscle of anterior thoracic wall the sternalis muscle make this case as unique and rare. This finding adds to our existing knowledge for the origin of sternalis, an identity not explored fully yet. Awareness of anomalous pectoralis major musculature as well presence of sternalis muscle is important for reconstructive surgeons who perform mastectomy and for radiologists during interpretation of skiagrams. Keywords: pectoralis major muscle, sternalis muscle, innervation. 1 Introduction The pectoralis major muscle is a thick triangular fan RATH, SHARMA et al., 2003). We report here an example shaped muscle of anterior chest wall. The clavicular head of appearance of the sternalis muscle with accompanying arises from the medial half of the anterior surface of the pectoralis major muscle anomaly. clavicle while the sternocostal head arises from the lateral part of the anterior surface of the manubrium and body of 2 Case Report sternum and from the aponeurosis of the external oblique During routine dissection, unusual unilateral variation of muscle over the upper attachment of rectus abdominis. The pectoral musculature was seen on right side of an adult male muscle inserts laterally in the intertubercular groove of the cadaver. The clavicular slips of pectoralis major muscle were humerus. The pectoralis major muscle is a prime flexor, chief seen arising as usual from medial half of the anterior surface adductor and medial rotator of the humerus. Innervation of the clavicle with absence of sternocostal slips whereas the is by the medial and lateral pectoral nerves (McMINN, muscular slips from aponeurosis of external oblique muscle 1998). Familiarity with the anatomic variations of pectoral were present forming the anterior fold of axilla and getting musculature is important as identifying them early to achieve insertion on lateral lip of inter tubercular sulcus. Interestingly appropriate dissection planes during surgery of the chest wall there was presence of one of the important and rare muscle of (DHURIA, MEHTA, LOH et al., 2009). anterior thoracic wall, the sternalis muscle arising unilaterally Like most limb girdle muscles, there is some doubt about from aponeurosis of external oblique muscle along with how much of pectoralis muscle developed from the limb bud aponeurotic fibers of pectoralis major muscle, running and how much from myotomes of the trunk, with migration vertically, parallel and lateral to sternum and then merging in either direction. On dissection 1 body in 20 shows, the with then merging with manubrium sterni (Figure 1). All presence of vertical musculoaponeurotic fibres on the surface muscular slips of pectoralis major muscle as well sternalis of the pectoralis major alongside the sternum called rectus muscle were getting innervation from medial and lateral sternalis muscle (McMINN, 1998). Some authors find it to pectoral nerves as in (Figure 2). The unique feature of be a variation of pectoralis major muscle when innervated present case study was the appearance of anterior thoracic by pectoral nerves, while others find that because it is often wall having triangular pectoralis major muscle inspite of fan innervated by intercostal nerves, it is an aberrant abdominal shaped. Clavicular slips, slips from external oblique muscle, muscle (ATRICAN, COSKUN, SARIKCIOGLU et al., formed the arms of the triangle and sternalis muscle with 2006). deficient sternocostal slips in center. The pectoralis major The sternalis muscle is often bilateral and sometimes was normal on left side. associated with the variation of the pectoralis major muscle (ATRICAN, COSKUN, SARIKCIOGLU et al., 2006). In 3 Discussion the clinical practice, it is essential for the radiologists and the surgeons to acknowledge this anomaly as it may pose a Anomalous pectoral musculature has been usually diagnostic dilemma, by mimicking a malignant breast mass reported earliar in literature. Bilateral partial absence on mammography, CT scan or MR imaging and thus an of clavicular head of pectoralis major with 2.5 cm gap unnecessary exploratory surgery can be avoided (KUMAR, was found between the clavicular and sternocostal head J. Morphol. Sci., 2014, vol. 31, no. 4, p. 241-243 241 BALA, M., PASSI, D. K. and KAUSHAL, S. Figure 1. Sternalis muscle with deficient sternocostal slips of pectoralis major muscle. Figure 2. Innervation of pectoralis major and sternalis muscle by medial and lateral pectoral nerves. (GOVAL, HARJEET and GUPTA, 2006). The sternocostal aponeurosis of the external oblique muscle and continued head is most commonly poorly developed and when absent above up to manubrium and had significant size. it is accompanied by hypertrophy of clavicular head. Thus Majority of sternalis muscles are supplied by intercostals the primitive muscle mass, giving rise to pectoral muscles, Nerves (MISRA, 1954; SHEN, CHIEN and LEE, 1992; attaches to the clavicle first, then fans out and subsequently JENG and SU, 1998). Additionally, participation of the attaches to the sternum and ribs. When the developmental pectoral nerves has also been reported (KIDA, IZUMI and arrest is partial, the sternocostal fibers are more likely to TANAKA, 2003). In the present case report, pectoral nerves be affected, sparing clavicular fibers (MOSCONI and were the sole supply to sternalis muscle. KAMATH, 2003). In the present case, partial absence of O’Neill and Folan-Curran (1998) reported the direct pectoralis muscle accompanied by presence of unilateral connection of muscle fibers between the sternalis and sternalis muscle has been reported. pectoralis major muscles. Additionally, Kida, Izumi The sternalis muscle is a fleshy band of longitudinal fibers and Tanaka (2003) reported the partial absence of the of varying length and width, located close to and generally sternocostal portion of the pectoralis major muscle. They parallel to the sternum. When typical, it arises from the suggested that the close relation of both muscles might sheath of the rectus abdominis muscle, aponeurosis of the show their origin, although a connection of muscle fibers external oblique muscle, pectoralis major muscle, or costal did not always indicate a muscle origin. They supported the cartilages and ends above onto the upper costal cartilages, opinion of the sternalis muscle derivation from the pectoralis manubrium, or may be joined to the sternal head of the major muscle. Shinohara reported three laws (migration, sternocleidomastoid muscle (SALMONS, 1995). When the fusion and separation) on nerve-muscle specificity. In the sternalis accompanies partial or complete congenital absence law of migration, the nerve is regarded as an indicator of the of the pectoralis major muscle, it may achieve significant route along which the muscle mass originated and migrated size (KITAMURA, YOSHIOKA, KANEDA et al., 1985). (i.e. diaphragm). In the law of fusion, when a muscle is In the present case, sternalis muscle was seen arising from supplied by two different nerves, this muscle is considered 242 J. Morphol. Sci., 2014, vol. 31, no. 4, p. 241-243 Pectoral-sternalis complex variation to have been formed by fusion of two muscle mass, each Internatonal Journal of Morphology, 2009, vol. 27, n. 4, p. 1213- of which was originally supplied by a separate nerve. Some 1216. muscle, e.g. the external oblique, are supplied both from the GOVAL, N, HARJEET and GUPTA, M. Bilateral variant origin of superficial and deep surfaces, and this dual surface supply pectoralis major. Nepal Medical College, 2006, vol. 8, n. 1, p. 65-68. is interpreted as suggesting that the muscle is a composite JENG, H. and SU, SJ. The sternalis muscle: an uncommon muscle. According to the law of separation, two different anatomical variant among Taiwanese. Journal of Anatomy, 1998, muscles supplied by a single nerve are considered to be vol. 193, n. 2, p. 287-288. PMid:9827644 PMCid:PMC1467848. derived from a single muscle mass (i.e. common muscle http://dx.doi.org/10.1046/j.1469-7580.1998.19320287.x mass for the sternecleidomastoid and trapezius muscles) KITAMURA, S., YOSHIOKA, T., KANEDA, M., MATSUOKA, (SHINOHARA, 1996). We think that further studies should K., CHEN, KL. and SAKAI, A. A case of the congenital partial be performed to clarify the derivation of the sternalis muscle defect of the pectoralis major-accompanied by the sternalis with on the view of these laws. The present case report supports enormous size. Kaibogaku Zasshi Journal of Anatomy, 1985, vol. that both the muscles i.e. pectoralis major and sternalis 60, n. 6, p. 728-732. PMid:3834728 developed from single muscle mass and further suggests that KUMAR, H., RATH, G., SHARMA, M., KOHLI, M. and RANI, sternalis belongs to upper limb muscle. B. Bilateral sternalis with unusual left sided presentation: a clinical It has been reported that in hypoplasia or deficit Perspective. Yonsei Medical Journal, 2003, vol. 44, n. 4, p. 719-722. sternocostal head of pectoralis major, the clavicular head get PMid:12950131. http://dx.doi.org/10.3349/ymj.2003.44.4.719 hypertrophied (MOSCONI and KAMATH, 2003). In the KIDA, MY., IZUMI, A. and TANAKA, S. Sternalis muscle: topic for present case, hypertrophy of clavicular head was not seen debate.
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