# Novel Muscle in Infraspinous Fossa

## TL;DR

This paper reports a new case of an extra muscle found in the infraspinous fossa and its connection to the infraspinatus muscle.

## Contribution

The study presents a previously undocumented accessory muscle variant in the infraspinous fossa.

## Key findings

- An accessory muscle was identified in the infraspinous fossa alongside the normally located infraspinatus muscle.
- The physical features and innervation patterns of the muscles were described in detail.

## Abstract

The infraspinatus muscle (IS) makes a minor contribution to lateral rotation of the arm but mainly serves to stabilize the glenohumeral (GH) joint as part of the rotator cuff. Although reports of variations in the rotator cuff muscles have been documented previously, specific discussions of IS variants are lacking. In this report, we present a novel case of an accessory muscle in the infraspinous fossa and its relationship to the IS, which was normally located. We describe the observed physical features of the muscles and their innervation patterns.