We describe a simple clinical sign which can differentiate between these conditions. It lies in the same plane as the flexor digitorum profundus. (1) This interconnection prevents the thumb interphalangeal joint from flexing without the distal interphalangeal (IP) joint of the index finger also flexing, and vice versa. Post was not sent - check your email addresses! By continuing you agree to the use of cookies. Copyright © 2005 The British Society for Surgery of the Hand. This muscle is located between the two muscles which facilitate flexion of the thumb, namely the Flexor Pollicis Brevis and the Abductor Pollicis. Use these images to learn, but if you want to use them on your own website please credit me! Rupture of the tendon of flexor pollicis longus is suspected when active flexion of the interphalangeal joint of the thumb is not possible. Published by Elsevier Ltd. All rights reserved. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. A simple clinical test of flexor pollicis longus rupture. Flexor Pollicis Longus (FPL) Instruct the patient “Bend the tip of your thumb” Insertion: distal phalanx of thumb Action: flexion of thumb IP joint Innervation: Median nerve The 13 musc… The 13 muscle groups you need to test in the hand exam: Pingback: Hand Exam: Motor 2/13 – Flexor Digitorum Profundus (FDP) | Sketchy Medicine, Pingback: Hand Exam: Motor 3/13 – Flexor Digitorum Superficialis (FDS) | Sketchy Medicine, Pingback: Hand Exam: Motor 4/13 – Thenar Muscles | Sketchy Medicine, Pingback: Hand Exam: Motor 5/13 – Interosseous Muscles | Sketchy Medicine, Pingback: Hand Exam: Motor 6/13 – Hypothenar Muscles | Sketchy Medicine, Pingback: Hand Exam: Motor 7/13 – EPB and APL | Sketchy Medicine, Pingback: Hand Exam: Motor 8/13 – EPL | Sketchy Medicine, Pingback: Hand Exam: Motor 9/13 – EDC | Sketchy Medicine, Pingback: Hand Exam: Motor 13/13 – Adductor Pollicis | Sketchy Medicine, Pingback: Hand Exam: Motor 12/13 – Extensor Carpi Ulnaris (ECU) | Sketchy Medicine, Pingback: Hand Exam: Motor 11/13 – Extensor Carpi Radialis Longus (ECRL) and Extensor Carpi Radialis Brevis (ECRB) | Sketchy Medicine, Pingback: Hand Exam: Motor 10/13 – Extensor Indicis Proprius (EIP) and Extensor Digiti Minimi (EDM) | Sketchy Medicine. All of the information on this website is purely for educational purposes and has not been peer-reviewed. Copyright © 2020 Elsevier B.V. or its licensors or contributors. It travels through the carpal tunnel which is the point connecting the palm and forearm, and goes into the thumb. The test we describe demonstrated integrity of the flexor pollicis longus musculotendinous unit and, therefore, a diagnosis of partial anterior interosseous nerve palsy was suggested. This site uses Akismet to reduce spam. The Flexor Pollicis Longus muscles moves through the hand as a tendon. In 1979 Richard Linburg and Brain Comstock wrote about anomalous tendon slips between the flexor pollicis longus (FPL) and the flexor digitorum profundus (FDP) muscles/tendons. The flexor pollicis longus is a muscle in the forearm and hand that flexes the thumb. Thenar Muscles: Instruct the patient “Bring your thumb out to the side” All supplied by posterior interosseous branch of the radial nerve . Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on Tumblr (Opens in new window), Click to share on Reddit (Opens in new window), Click to share on Pinterest (Opens in new window), Click to email this to a friend (Opens in new window), Hand Exam: Motor 1/13 – Flexor Pollicis Longus (FPL), Hand Exam: Motor 2/13 – Flexor Digitorum Profundus (FDP) | Sketchy Medicine, Hand Exam: Motor 3/13 – Flexor Digitorum Superficialis (FDS) | Sketchy Medicine, Hand Exam: Motor 4/13 – Thenar Muscles | Sketchy Medicine, Hand Exam: Motor 5/13 – Interosseous Muscles | Sketchy Medicine, Hand Exam: Motor 6/13 – Hypothenar Muscles | Sketchy Medicine, Hand Exam: Motor 7/13 – EPB and APL | Sketchy Medicine, Hand Exam: Motor 8/13 – EPL | Sketchy Medicine, Hand Exam: Motor 9/13 – EDC | Sketchy Medicine, Hand Exam: Motor 13/13 – Adductor Pollicis | Sketchy Medicine, Hand Exam: Motor 12/13 – Extensor Carpi Ulnaris (ECU) | Sketchy Medicine, Hand Exam: Motor 11/13 – Extensor Carpi Radialis Longus (ECRL) and Extensor Carpi Radialis Brevis (ECRB) | Sketchy Medicine, Hand Exam: Motor 10/13 – Extensor Indicis Proprius (EIP) and Extensor Digiti Minimi (EDM) | Sketchy Medicine. We use cookies to help provide and enhance our service and tailor content and ads. This can be a result of trauma but, when spontaneous, diagnostic confusion can exist as incomplete palsy of the anterior interosseous nerve can present in a similar way. Nerve conduction studies demonstrated an injury to the brachial plexus with preferential involvement of nerve fibres destined for the anterior interosseous nerve. The Journal of Hand Surgery: British & European Volume, https://doi.org/10.1016/j.jhsb.2005.06.005. Learn how your comment data is processed. Abductor Pollicis Longus (APL) Insertion: base of the 1st metacarpal; Action: extension of the 1st metacarpal and helps with abduction; Innervation: posterior interosseous branch of the radial nerve; Extensor Pollicis Brevis (EPB) This can be a result of trauma but, when spontaneous, diagnostic confusion can exist as incomplete palsy of the anterior interosseous nerve can present in a similar way. Rupture of the tendon of flexor pollicis longus is suspected when active flexion of the interphalangeal joint of the thumb is not possible. Sorry, your blog cannot share posts by email. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

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