Two Cases of Rectus Sternalis Muscle (original) (raw)

Case report on bilateral rectus sternalis muscles: A mysterious muscle

JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL SCIENCES, 2014

case report on bilateral rectus sternalis muscles: A mysterious muscles. J Pharm Biomed Sci 2014; 04(02): 80-83. The online version of this article, along with updated information and services, is located on the World Wide Web at: www.jpbms.info Journal of Pharmaceutical and Biomedical Sciences (J Pharm Biomed Sci.), Member journal. Committee of Publication ethics (COPE) and Journal donation project (JDP).

Sternalis Muscle: a Case Report and Literature Review

Acta morphologica et anthropologica

Sternalis muscle is an anatomical variation of the anterior thoracic wall. Its incidence in white population is 4-7%. During a routine dissection of male cadaver, a long flat muscular structure was observed, crossing the anterior thoracic wall, which was composed of two bellies and intermediate tendon. It was located underneath the superficial thoracic fascia and superficially to pectoralis major. Superior belly was oriented parallel and merges with the fibers and fascia of right pectoralis major. Thin long intermediate tendon crossed the sternum. The inferior portion of the muscle was wider and longer than the upper one. Its fibers were oriented perpendicularly to the fibers of left pectoralis major and caudally fused with the anterior layer of the rectus abdominis sheath. The two bellies had different nerve supply by the pectoral nerve (superior belly) and anterior branches of the intercostal nerves (inferior belly). The knowledge of sternalis muscle is important for radiologists and surgeons.

Bilateral Rectus Sternalis Muscle-Case Report

https://www.ijrrjournal.com/IJRR\_Vol.5\_Issue.5\_May2018/Abstract\_IJRR002.html, 2018

Pectoralis major muscle is a well known muscle of body. Sometimes we may find a linear muscle superficial to it, which may be considered as supernumerary, called rectus sternalis. Here we are going to explain rectus sternalis muscle, which we found on both sides. During management of pectoral region, radiologist and surgeons should have the knowledge of this muscle.

Rectus Sternalis Muscle - A Rare Variant

International Journal of Trend in Scientific Research and Development - IJTSRD, 2019

Rectus sternalis muscle is a rare morphological variation of the musculature of the anterior abdominal wall. A unilateral right sided Rectus sternalis muscle was found during routine dissection of a 55 years old female cadaver with hefty built at

An unusual sternalis with variation of the contralateral sternocleidomastoid muscle: A Case Report

Purpose To report a previously undocumented variant of sternalis. Methods An unusual muscle was observed during routine dissection. Results The sternalis muscle located in the right thoracic region originated from the superior portion of the rectus abdominis sheath and 5-6th costal cartilages, crossed the midline and attached at the sternum. The muscle fibers then ascended with the left sternocleidomastoid muscle as an additional fasciculus, of which the superior ends were finally terminated at the left mastoid process. The sternalis muscle of the thoracic region was innervated by the anterior cutaneous branches of right intercostal nerve, while the additional fasciculus ascended with the left sternocleidomastoid muscle was innervated by the branches of left accessory nerve. Conclusions This study presents a unilateral sternalis muscle with the contralateral sternocleidomastoid variation. It will enhance the exhaustive classification of sternalis, and provide significant information...

On the clinical significance of the sternalis muscle

During routine anatomical dissection, two cases of sternalis muscle were described. In the first case a unilateral sternalis on the left side was observed. It started from the fibres of the sternal membrane, then passed downwards with a slightly arch-shaped course and ended in the pectoral fascia at the level of 6-7 costal cartilages. In the second case a bilateral sternalis muscle composed of two bellies (right and left) was detected. It arose from the sternal membrane covering the sternal angle. The right belly was attached to the fourth costal cartilage at the sternal junction; the left one inserted into in the third costal cartilage also at the sternal junction. In these cases sternalis muscles were supplied by perforating branches of the internal thoracic arteries and innervated by anterior branches of the intercostals nerves. We have also review the available literature concerning the clinical importance of the sternalis and summarized it clearly for clinical anatomist, plastic surgeons, breast surgeons and radiologists.

Sternalis "mystery" muscle and its clinical implications

Italian journal of anatomy and embryology = Archivio italiano di anatomia ed embriologia, 2011

Sternalis is an anomalous muscle found occasionally in the anterior part of the thorax. During routine dissection sternalis muscle was found in a male cadaver. This rare anatomic variant is reported in 8% of the population. In the present case, the muscle was found bilaterally, placed obliquely on either side of the sternum. It originated by tendinous fibres from the lower costal cartilages and inserted to the manubriosternal junction. The right side muscle was well developed whereas the left one was reduced in size. The pectoralis major and minor were normal. The knowledge of sternalis is important for radiologists and surgeons.

Rectus thoracis bifurcalis: a new variant in the anterior chest wall musculature

Romanian journal of morphology and embryology = Revue roumaine de morphologie et embryologie, 2010

A cadaveric study was undertaken to report the incidence of sternalis muscle in cadavers of Asian origin. A total of 88 cadavers were studied over a period of six years and the sternalis was reported only in a single case and that too unilaterally. The accessory muscle was discovered in the right pectoral region in a 40-year-old male cadaver. The muscle emanated from the external oblique aponeurosis of abdomen confirming its origin from the ventral longitudinal sheet of muscle. The muscle was fleshy throughout its extent except at the ends where they were aponeurotic. At the sternal angle, the muscle displayed "Y" shaped configuration and merged with the respective sternocleidomastoid muscle. The innervation was derived from the third intercostals nerve. We intend to highlight a few points through this study. Firstly, we found a paucity of studies undertaken to describe the incidence of sternalis muscle. Further, the studies present in anatomical archives are mainly case r...

Anatomy and clinical implications of the sternalis muscle: A literature review

2024

The sternalis muscle (SM) is an inconsistent and highly uncommon structure among the muscles of the anterior chest wall (POVEDA et al., 2013). It lies between the superficial fascia and the pectoral fascia, found in about 8% of the population (SNOSEK et al., 2014). The frequency of its occurrence varies significantly among different ethnic groups, being more prevalent in the Chinese population at 23.5% and less prevalent in the Taiwanese population at 1% (RAIKOS et al., 2011; VISHAL et al., 2013), while its incidence is 4.4% in the European population and 8.4% in the African population (LOUKAS et al., 2004).