Everyday Muscle.

Latissimocondyloideus

Back
Accessory muscle slip from latissimus dorsi toward the humeral condyle — variable in form, rarely symptomatic, and usually an incidental surgical finding.
Function
May assist arm extension/adduction; anatomy is variable
Origin
Latissimus dorsi region
Insertion
Medial epicondyle/condylar region or arm fascia
Innervation
Likely thoracodorsal nerve when derived from latissimus dorsi
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Latissimus Dorsi Erector Spinae Iliocostalis Spinalis Multifidus Rotatores Interspinales Intertransversarii Serratus Posterior Inferior Serratus Posterior Superior