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Anat Cell Biol

Published online October 31, 2022


Copyright © Korean Association of ANATOMISTS.

An accessory muscle of flexor digitorum profundus with bipennate first lumbrical: a unique variation of clinical significance

Rohini Motwani , Ariyanachi Kaliappan , Mrudula Chandrupatla

Department of Anatomy, All India Institute of Medical Sciences, Hyderabad, Telangana, India

Correspondence to:Ariyanachi Kaliappan
Department of Anatomy, All India Institute of Medical Sciences, Hyderabad, Telangana 508126, India
E-mail: ariyan.mahi@gmail.com

Received: July 18, 2022; Revised: August 19, 2022; Accepted: October 1, 2022

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


During the deep dissection of the front of the forearm, an anomalous accessory muscle in relation to the flexor digitorum profundus (FDP) muscle was observed in the right forearm. The accessory muscle consisted of a spindle-shaped muscle belly with a long tendon underneath the flexor pollicis longus muscle. When followed distally, the accessory muscle tendon was found lateral to the FDP tendon for the index finger and entered the palm deep to the flexor retinaculum. In the palm, we encountered the first lumbrical muscle as a bipennate muscle taking origin from the adjacent sides of the middle of the tendons of FDP and accessory muscle tendon. After giving origin to first lumbrical muscle, the accessory muscle got merged with the tendon of FDP for index finger. Understanding this kind of variation is required for radiologists and hand surgeons for diagnostic purposes and while performing corrective surgical procedures.

Keywords: Accessory muscle, Bipennate, Forearm, Gantzer muscles, Lumbricals

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