EPL

EPL

Extensor pollicis longus refers to a muscle that crosses the wrist on the dorsal surface and is responsible for extending the interphalangeal joint of the thumb. It is one of the muscles located on the posterior side of the wrist, along with the abductor pollicis longus and extensor pollicis brevis. In cases where the EPL has lower motor neuron damage, the palmaris longus muscle can be transferred to provide thumb extension.From: Kinematic MRI of the Joints [2019], Analysis of High-Density Surface Electromyogram (HD-sEMG) signal for thumb posture classification from extrinsic forearm muscles [2022], Neural Prostheses for Restoration of Sensory and Motor Function [2019]

Functional Anatomy and Biomechanics

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Published in Emeric Arus, Biomechanics of Human Motion, 2017

Emeric Arus

Musculus extensor pollicis longus and extensor pollicis brevis are extensors of the thumb. Their origin of insertion is at the interosseus membrane of the ulna and radius. The distal insertion of the pollicis longus is on the distal phalanx of the thumb. The distal insertion of the pollicis brevis is on the base of the proximal phalanx of the thumb. Their actions are at the distal respective proximal phalanx level. They are innervated by the radial nerve.

Analysis of High-Density Surface Electromyogram (HD-sEMG) signal for thumb posture classification from extrinsic forearm muscles

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Published in Cogent Engineering, 2022

Muhammad Mukhlis Suhaimi, Aimi Shazwani Ghazali, Ahmad Jazlan, Naim Sidek

On the other hand, extrinsic muscles consist of various muscles that perform different functions, for example, the Flexor Pollicis Longus controls the thumb digit from the anterior side (Flexor Pollicis Longus, 2021). As for the posterior side, there are three muscles, namely, the Abductor Pollicis Longus, which controls the abduction and extension of the thumb (Physiopedia contributors, 2021), Extensor Pollicis Brevis, which is a mild abductor of the thumb (Jabir et al., 2013), and Extensor Pollicis Longus, which extends the interphalangeal joint of the thumb (Physiopedia contributors, 2021) as illustrated in Figure 3. For the transradial amputees, due to the loss of the intrinsic hand muscles, one of the options to extract the information in classifying the thumb posture is through their extrinsic muscles.

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Functional Anatomy and Biomechanics

Analysis of High-Density Surface Electromyogram (HD-sEMG) signal for thumb posture classification from extrinsic forearm muscles