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The Hand

Muscles and Joints of the Hand and Thumb

TermDefinition
Flexor Digitorum Superficialis- Origin Common flexor tendon on medial epicondyle, coronoid process, & radius
Flexor Digitorum Superficialis- Insertion Sides of middle phalanx of 4 fingers
Flexor Digitorum Superficialis- Nerve Innervation Median nerve (C7, C8, T1)
Flexor Digitorum Superficialis- Action Flexes MCP & PIP joints of fingers
Flexor Digitorum Profundus- Origin Upper ¾ of ulna
Flexor Digitorum Profundus- Insertion Distal phalanx of 4 fingers
Flexor Digitorum Profundus- Nerve Innervation Median & Ulnar nerves (C8, T1)
Flexor Digitorum Profundus- Action Flexes all 3 joints (MCP, PIP, and DIP) of fingers
Flexor Pollicis Longus- Origin Anterior surface of radius
Flexor Pollicis Longus- Insertion Distal phalanx of thumb
Flexor Pollicis Longus- Nerve Innervation Median nerve (C8, T1)
Flexor Pollicis Longus- Action Flexes all 3 joints ( CMC , MCP, and IP) of thumb
Abductor Pollicis Longus- Origin Posterior radius, interosseous membrane, middle ulna
Abductor Pollicis Longus- Insertion Base of the 1st metacarpal
Abductor Pollicis Longus- Nerve Innervation Radial nerve (C6, C7)
Abductor Pollicis Longus- Action Abducts thumb (CMC)
Extensor Pollicis Brevis- Origin Posterior distal radius
Extensor Pollicis Brevis- Insertion Base of proximal phalanx of thumb
Extensor Pollicis Brevis- Nerve Innervation Radial nerve (C6, C7)
Extensor Pollicis Brevis- Action Extends CMC and MCP joints of thumb
Extensor Pollicis Longus- Origin Middle posterior ulna & interosseous membrane
Extensor Pollicis Longus- Insertion Base of distal phalanx of thumb
Extensor Pollicis Longus- Nerve Innervation Radial nerve (C6, C7, C8)
Extensor Pollicis Longus- Action Extends all 3 joints (CMC, MCP, & IP) of thumb
Extensor Digitorum- Origin Lateral epicondyle of humerus
Extensor Digitorum - Insertion Base of distal phalanx of 2nd- 5th fingers
Extensor Digitorum - Nerve Innervation Radial nerve (C6, C7, C8)
Extensor Digitorum - Action Extends all 3 joints (MCP, PIP, & DIP) of the fingers
Extensor Indicis- Origin Posterior surface of distal ulna
Extensor Indicis- Insertion Base of distal phalanx of 2nd finger
Extensor Indicis- Nerve Innervation Radial nerve (C6, C7, C8)
Extensor Indicis- Action Extends all 3 joints of 2nd finger (MCP, PIP, & DIP)
Extensor Digiti Minimi- Origin Lateral epicondyle of humerus
Extensor Digiti Minimi- Insertion Base of distal phalanx of 5th finger
Extensor Digiti Minimi- Nerve Innervation Radial nerve (C6, C7, C8)
Extensor Digiti Minimi- Action Extends all 3 joints of 5th finger (MCP, PIP, & DIP)
Flexor Pollicis Brevis- Origin Trapezium & flexor retinaculum
Flexor Pollicis Brevis- Insertion Proximal phalanx of thumb
Flexor Pollicis Brevis- Nerve Innervation Median nerve (C6, C7)
Flexor Pollicis Brevis- Action Flexes CMC & MCP joints of thumb
Abductor Pollicis Brevis- Origin Scaphoid, trapezium, flexor retinaculum
Abductor Pollicis Brevis- Insertion Base of proximal phalanx of thumb
Abductor Pollicis Brevis- Nerve Innervation Median nerve (C6, C7)
Abductor Pollicis Brevis- Action Abducts thumb (CMC joint)
Opponens Pollicis- Origin Trapezium & flexor retinaculum
Opponens Pollicis- Insertion First metacarpal
Opponens Pollicis- Nerve Innervation Median nerve (C6, C7)
Opponens Pollicis- Action Opposes thumb (CMC joint)
Adductor Pollicis- Origin Capitate, base of 2nd & palmar surface of 3rd metacarpals
Adductor Pollicis- Insertion Base of proximal phalanx of thumb
Adductor Pollicis- Nerve Innervation Ulnar nerve (C8, T1)
Adductor Pollicis- Action Adducts thumb (CMC joint)
Dorsal Interossei- Origin Adjacent metacarpals
Dorsal Interossei- Insertion Base of proximal phalanx
Dorsal Interossei- Nerve innervation Ulnar nerve (C8, T1)
Dorsal Interossei- Action Abduct fingers at MCP joint
Palmar Interossei- Origin Base of 1st, 2nd, 4th, & 5th metacarpals
Palmar Interossei- Insertion Base of proximal phalange of respective proximal phalanx
Palmar Interossei- Nerve Innervation Ulnar nerve (C8, T1)
Palmar Interossei- Action Adduct fingers at MCP joint
Lumbricals- Origin Tendon of flexor digitorum profundus
Lumbricals- Insertion Tendon of extensor digitorum
Lumbricals- Nerve Innervation 2nd & 3rd: Median 4th & 5th: Ulnar
Lumbricals- Action Flexes MCP while extending PIP, DIP
Flexor Digiti Minimi- Origin Hamate & flexor retinaculum
Flexor Digiti Minimi- Insertion Base of proximal phalanx of 5th finger
Flexor Digiti Minimi- Nerve Innervation Ulnar nerve (C8, T1)
Flexor Digiti Minimi- Action Flexes CMC & MCP joints of 5th finger
Abductor Digiti Minimi- Origin Pisiform & flexor retinaculum
Abductor Digiti Minimi- Insertion Base of proximal phalanx of 5th digit
Abductor Digiti Minimi- Nerve Innervation Ulnar nerve (C8, T1)
Abductor Digiti Minimi- Action Abducts MCP joint of 5th finger
Opponens Digiti Minimi- Origin Flexor retinaculum & hook of hamate
Opponens Digiti Minimi- Insertion Shaft of 5th metacarpal
Opponens Digiti Minimi- Nerve Innervation Ulnar nerve (C8, T1)
Opponens Digiti Minimi- Action Opposes CMC joint of 5th finger
Created by: jello-cup