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Case Reports
. 2022 Jan;44(1):93-97.
doi: 10.1007/s00276-021-02848-w. Epub 2021 Oct 9.

Interclavicularis anticus digastricus muscle in a female body donor: a case report

M K Roesler  1 , M J Schmeisser  1   2 , S Schumann  3
Affiliations
Case Reports

Interclavicularis anticus digastricus muscle in a female body donor: a case report

M K Roesler et al. Surg Radiol Anat. 2022 Jan.

Abstract

Background and objectives: Muscular variations of the ventral thoracic wall are generally common and of great clinical interest.

Materials and methods: An unusual muscular variation of the ventral thoracic wall was observed and dissected in a West-European female body donor.

Results: An interclavicularis anticus digastricus muscle was observed and studied. It originated from the manubrium sterni and inserted bilaterally to the clavicles. Both muscle bellies were interconnected by a tendon on the ventral surface of the manubrium sterni. The muscle was innervated by branches of the lateral pectoral nerve.

Conclusions: The interclavicularis anticus digastricus muscle is a muscular variation of the ventral thoracic wall of unknown prevalence. This variation might be of clinical interest in orthopaedics and thoracic surgery. It is also a vulnerable structure during infraclavicular insertion of a subclavian vein catheter or fractures of the clavicle.

Keywords: Clavicle; Lateral pectoral nerve; Muscular variations; Pectoralis major muscle; Sternum.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Fig. 1
Fig. 1
a Left muscle belly of the interclavicularis anticus digastricus muscle (IADM, highlighted in yellow). The left pectoralis major muscle was resected. Graph paper on the sternal end of the left clavicle indicates a length of 3 cm. b Right muscle belly of the IADM (highlighted in yellow). The right pectoralis major muscle was resected. Graph paper on the acromial end of the right clavicle indicates a length of 3 cm. c Interconnecting tendon (highlighted in yellow) on the ventral surface of the manubrium sterni. Connective tissue surrounding the tendon in forceps. d Branch from the left lateral pectoral nerve (in forceps, highlighted in yellow) to the left muscle belly of the IADM. e Resected IADM including the left and right muscle belly with the according nerves and interconnecting tendon. cr cranial, ca caudal, la lateral, me medial, lcl left clavicle, rcl right clavicle, cpf clavipectoral fascia, de deltoid muscle, it interconnecting tendon, lb left muscle belly, lpn left pectoral nerve, rb right muscle belly of the IADM, mpi pectoralis minor muscle, sc subclavius muscle, scm sternocleidomastoideus muscle, st sternum, vc cephalic vein
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