Absence of the subclavius muscle with contralateral subclavius posticus muscle: first imaging report

Yun, Sam; Park, Sekyoung

doi:10.1016/j.clinimag.2017.10.008

Cited by 8 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mastectomy causes hypertrophy of the subclavius and atrophy of pectoral muscles in females [ 12 ]. The recent trend of SMs variations pertaining to its accessory muscle formation [ 13 ] or absence [ 3 ] or muscle replaced by ligaments [ 14 ] etc. has been increasing.…”

Section: Discussionmentioning

confidence: 99%

“…During embryological development, there is a single mesodermal matrix for the development of the inferior belly of omohyoid, SM, and occasionally for the subclavius posticus muscle [ 3 ]. The possible explanation in our case is that the same single matrix developed into the inferior belly of the omohyoid alone but not the SM and subclavius posticus.…”

Section: Discussionmentioning

confidence: 99%

“…Knowledge of anatomical variations influences the predisposition to diseases, symptomatology, clinical examination, diagnostic, and patient management [ 2 ]. One such variation is the absence of subclavius muscles (SM) and thickened costocoracoid ligaments (CCL), which are uncommon and very often unilateral [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bilateral absence of subclavius muscles with thickened costocoracoid ligaments: a case report with the clinical-anatomical correlation

et al. 2022

View full text Add to dashboard Cite

Anatomical variation is defined as normal flexibility in the topography and morphology of body structures. Such variations are not uncommon in muscles, particularly in the upper limb. Subclavius muscle (SM) has a proximal attachment to the first costochondral junction and the muscle fibers are then directed upwards and laterally to get attached distally to the subclavian groove of the clavicle. Having similar attachments as the subclavius, the costocoracoid ligament (CCL) is the thickening of the proximal part of clavipectoral fascia extending up to the coracoid process. Both SM and CCL help in the maintenance of smooth movements of the pectoral girdle and both may not always be present. Absent SM may be due to anomalous development from the muscle matrix that also forms the inferior belly of the omohyoid apart from the SMs. This anatomical variation may be associated with thickened CCLs and can be correlated to the smooth functioning of the pectoral girdle.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Bilateral absence of subclavius muscles with thickened costocoracoid ligaments: a case report with the clinical-anatomical correlation

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Most of the authors found an aberrant muscle, named subclavius posticus muscle or chondroscapularis muscle [3], with the same origin on the first costal cartilage or on the superior surface of the sternal end of the first rib [3], and variable insertion on the superior border of the scapula, mediocaudal to the inferior belly of the omohyoid [2], on the superior border of the scapula and superior transverse scapular ligament [4], on the transverse scapular ligament and coracoid process [5], on the superior angle of the scapula, on an additional ligament extending from the medial margin of the suprascapular notch and the capsule of acromioclavicular joint, and on the axillary sheath and fascia covering the subscapularis muscle [6]. Yun et al [7] described the absence of subclavius muscle with contralateral subclavius posticus muscle in 1 case. Sato et al (cited by Akita et al [2]) proposed that, according to their location, origin, insertion and most important according to their innervations, these aberrant muscles can be classified in 2 categories, subclavius posticus muscle innervated by a branch from the nerve to the subclavius muscle, and a duplication of the inferior belly of the omohyoid muscle, innervated by a branch from the nerve to the inferior belly of the omohyoid muscle.…”

Section: Discussionmentioning

confidence: 99%

An Aberrant Subclavius Posticus Muscle: A Case Report

Grigoriță¹,

Vaida²,

Jianu³

2018

Med Princ Pract

View full text Add to dashboard Cite

Objective: An aberrant subclavius posticus muscle was found during routine dissection of the left infraclavicular fossa of a 60-year-old male cadaver. Presentation: This aberrant muscle arises antero-medially, from the costoclavicular ligament, runs postero-laterally, over the trunks of the brachial plexus, and postero-lateral has a common insertion with the omohyoid muscle. Conclusion: The presence of such an aberrant muscle may cause a dynamic compression of the subclavian artery and brachial plexus.

show abstract

“…In one description the lateral part of the SM was separated into a superomedial part inserted into the inferior surface of the clavicle and an inferolateral part inserted on to the root of the CP in 12 (16.8%) of 72 cases (Mori, 1964). Absence of the SM has been described (Crerar, 1892;Georgiev & Jelev, 2009;Le Double, 1897;Yun et al, 2018). In one of these reports, bilateral fibrous bands replaced the usual SM and were attached to the tip of the CP laterally (Georgiev & Jelev, 2009).…”

Section: Introductionmentioning

confidence: 99%

The anatomy and variation of the coracoid attachment of the subclavius muscle in humans

et al. 2021

View full text Add to dashboard Cite

The functions of the subclavius muscle (SM) are described as stabilization of the sternoclavicular joint (SCJ) and resisting elevation of the lateral end of the clavicle. During systematic cadaveric dissections, we observed additional fibrous structures, previously described as variants of the anatomy, extending from the SM and inserting into the coracoid process (CP). Due to the high incidence of these structures in our dissections, we hypothesized that the attachment at the CP is more common than appreciated and that, as a corollary, the function of the SM was (or has been) more complex than simply depressing the clavicle and generating stability at the SCJ. For our investigation, fifty-two upper extremities of 26 human cadavers were dissected. The SM was demonstrated from costal to clavicular attachment. We documented additional fibrous structures apparently derived from the SM inserting into the CP. Measurements of the length of the SM, the length of its attachment, and the length of the clavicle were taken in situ, with the specimens supine and the upper extremity in the anatomical position. Variations in the anatomy of the SM and its coracoidal attachment were recorded, and potential correlations were investigated.For documentation purposes photographs and video sequences of passive motion of the shoulder girdle of the specimens were taken. In 49 of the 52 specimens we found additional fibrous structures passing from the SM to the CP. We differentiated three types: (1) a strong cord-like structure; (2) a small or thin cord-like structure or structures; and (3) a planar twisted sheet-like structure. The SM and its extension to the CP appears to contribute to a 'functional scapular suspension system' together with the other muscles enveloped by the clavipectoral fascia (pectoralis minor, coracobrachialis and the short head of the biceps brachii). This system assists in the control of the position of the scapula in relation to the thorax, particularly in elevated positions of the upper extremity. We speculate that the differentiation of the fibrous structure depends on the functional demands of the individual.

show abstract

Absence of the subclavius muscle with contralateral subclavius posticus muscle: first imaging report

Cited by 8 publications

References 10 publications

Bilateral absence of subclavius muscles with thickened costocoracoid ligaments: a case report with the clinical-anatomical correlation

Bilateral absence of subclavius muscles with thickened costocoracoid ligaments: a case report with the clinical-anatomical correlation

An Aberrant Subclavius Posticus Muscle: A Case Report

The anatomy and variation of the coracoid attachment of the subclavius muscle in humans

Contact Info

Product

Resources

About