Opponens Pollicis O, I, A
Origin: Distal border of the flexor retinaculum and the trapezium
Insertion: Lateral aspect of the first metacarpal
Actions: Opposition of the thumb toward the digits
Innervation: Median nerve (C8, T1)
Blood Supply: Superficial palmar branches of the radial artery
Primary Actions of the Opponens Pollicis
1. Opposition of the thumb toward the digits
Agonists:
- Abductor Pollicis Brevis
- Adductor Pollicis
- Flexor Pollicis Brevis
Antagonists:
- Extensor Pollicis Longus
- Extensor Pollicis Brevis
- Abductor Pollicis Longus
2. Flexion of the thumb at the carpometacarpal joint
Agonists:
- Adductor Pollicis
- Flexor Pollicis Longus
- Flexor Pollicis Brevis
Antagonists:
- Abductor Pollicis Longus
- Extensor Pollicis Brevis
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Information about cause and effect pain: Opponens Pollicis Pain and Symptoms
An excellent book for those beginning the study of anatomy. Coloring helps memory retention.
For intermediary anatomy students learning skeletal and muscle structure.
For beginning and intermediary anatomy . Muscle overlays on the human body. Excellent visuals!