Anatomy Muscles 325-350
Terms
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- Midpalmar origin and insertion
- origin: Origin; insertion: Insertion
- Lumbricals action
- Flex fingers at metacarpophalangeal joints but extend fingers at interphalangeal joints
- Lumbricals innervation
- Median nerve (lateral 2); Ulnar nerve (medial 2)
- Opponens Digiti Minimi origin and insertion
- origin: Hamate bone and flexor retinaculum; insertion: Most of length of lateral side of metacarpal 5
- Midpalmar action
- Action
- Midpalmar innervation
- Nerve
- Flexor Digiti Minimi Brevis origin and insertion
- origin: Hamate bone and flexor retinaculum; insertion: Medial side of proximal phalanx of little finger
- Opponens Digiti Minimi action
- Helps in opposition: brings metacarpal 5 toward thumb to cup the hand
- Opponens Digiti Minimi innervation
- Ulnar nerve
- Abductor Digiti Minimi origin and insertion
- origin: Pisiform bone; insertion: Medial side of proximal phalanx of little finger
- Flexor Digiti Minimi Brevis action
- Flexes little finger at metacarpophalangeal joint
- Flexor Digiti Minimi Brevis innervation
- Ulnar nerve
- Hypothenar origin and insertion
- origin: Origin; insertion: Insertion
- Abductor Digiti Minimi action
- Abducts (and flexes) little finger at metacarpophalangeal joint
- Abductor Digiti Minimi innervation
- Ulnar nerve
- Adductor Pollicis origin and insertion
- origin: Bases of metacarpals 2-4; front of metacarpal 3; insertion: Medial side of base of proximal phalanx of thumb
- Hypothenar action
- Action
- Hypothenar innervation
- Nerve
- Opponens Pollicis origin and insertion
- origin: Flexor retinaculum and nearby carpals; insertion: Whole anterior side of metacarpal 1
- Adductor Pollicis action
- Adducts thumb
- Adductor Pollicis innervation
- Ulnar nerve
- Flexor Pollicis Brevis origin and insertion
- origin: Flexor retinaculum and nearby carpals; insertion: Lateral side of base of proximal phalanx of thumb
- Opponens Pollicis action
- Opposition: moves thumb to touch tip of little finger
- Opponens Pollicis innervation
- Median nerve
- Abductor Pollicis Brevis origin and insertion
- origin: Flexor retinaculum; insertion: Lateral base of thumb’s proximal phalanx