Hypothenar Muscles: Instruct the patient “Bring your little finger away from the others”
All supplied by deep branch of ulnar nerve
Abductor Digiti Minimi (ADM)
- Origin: pisiform
- Insertion: medial side of base of proximal phalanx of small finger
- Action: abducts small finger, extends IP joints when MCP joint is stabilized
- Innervation: deep branch of ulnar nerve
Flexor Digiti Minimi (FDM)
- Origin: Flexor retinaculum and hook of the hamate
- Insertion: medial side of base of proximal phalanx of small finger
- Action: flexes MCP joint
- Innervation: deep branch of ulnar nerve
Opponens Digiti Minimi (ODM)
- Origin: Flexor retinaculum and hook of the hamate
- Insertion: medial border of 5th metacarpal
- Action: rolls 5th metacarpal toward thumb, flexes 4th and 5th MCP joints for better thumb opposition
- Innervation: deep branch of ulnar nerve
The 13 muscle groups you need to test in the hand exam:
- FPL
- FDP
- FDS
- Thenar muscles
- Interosseous
- Hypothenar muscles
- EPB and APL
- EPL
- EDC
- EIP and EDM
- ECRL and ECRB
- ECU
- Adductor Pollicis
Pingback: Hand Exam: Motor 8/13 – EPL | 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
Pingback: Hand Exam: Motor 3/13 – Flexor Digitorum Superficialis (FDS) | Sketchy Medicine
Pingback: Hand Exam: Motor 7/13 – Extensor Pollicis Brevis (EPB) and Abductor Pollicis Longus (APL) | Sketchy Medicine