Lab 7 Flashcards
Pronator Teres
Origin: Medial epicondyle of the humerus
Insertion: Mid-shaft of lateral radius
Innervation: Median nerve
Main actions: Radioulnar pronation
Flexor Carpi Radialis
(Radial side, “wrist”)
Origin: medial epicondyle of humerus
Insertion: base of metacarpals 2 and 3
Innervation: median nerve
Main actions: wrist flexion and abduction
Palmaris Longus
Origin: medial epicondyle of humerus
Innervation: median nerve
Main actions: wrist flexion
Flexor carpi ulnaris
Origin: medial epicondyle of humerus
Insertion: base of 5th metacarpal
Innervation: Ulnar nerve
Main actions: wrist flexion and adduction
Flexor Digitorum Superficialis
Origin: Medial epicondyle of the humerus
Insertion: digits 2-5
Innervation: Median nerve
Main actions: flexion and elbow flexion
Flexor Digitorum Profundus ⭐️
Origin: anterior ulna
Insertion: distal phalanges
Innervation: lateral half median nerve
Main actions: wrist flexion
Flexor Pollicis Longus
Origin: anterior radius and lateral half of the interosseous membrane
Insertion: palmar surface of distal phalanx of the thumb
Innervation: median nerve
Main action: thumb flexion
Pronator Quadratus
Origin: lower/distal 1/4 anterior ulna
Insertion: lower/distal 1/4 anterior radius
Innervation: median nerve
Main actions: radio-ulnar pronation
Brachioradialis (drink from a cup)
Origin: lateral supracondylar ridge of the humerus
Insertion: Styloid process of the radius
Innervation: radial nerve
Main action: elbow flexion in semi-pronation
Extensor Carpi Radialis Longus
Origin: lateral epicondyle of humerus
Insertion: dorsal surface of base of metacarpal 2
Innervation: Radial nerve
Main actions: wrist extension and abduction
Extensor Carpi Radialis Brevis
Origin: lateral epicondyle of humerus
Insertion: base of metacarpals 2 and 3
Innervation: radial nerve
Main actions: wrist extension and abduction
Extensor Digitorum
Origin: lateral epicondyle of humerus
Insertion: base of distal phalanges of digits 2-5
Innervation: radial nerve
Main actions: wrist extension
Extensor Digiti Minimi ⭐️
Origin: lateral epicondyle of humerus
Insertion:extensor hood of digit 5
Innervation: posterior interosseous nerve
Main actions: extension of digit 5
Extensor carpi ulnaris
Origin: lateral epicondyle of humerus
Insertion: base of 5th metacarpal
Innervation: posterior interosseous nerve
Main actions: wrist extension and adduction
Abductor Pollicis Longus
Origin: posterior surfaces of ulna and radius
Insertion: base of first metacarpal
Innervation: posterior and interosseous nerve
Main actions: thumb abduction
Extensor Pollicis Longus
(Can see when thumb is stretched up)
Origin: posterior surfaces of ulna
Insertion: dorsal surface of base of distal phalanx of thumb
Innervation: posterior interosseous nerve
Main actions: thumb extension ( thumbs up)
Extensor Pollicis Brevis
Origin: posterior surface of radius
Insertion: dorsal surface of base of the proximal phalanx of thumb
Innervation: posterior interosseous nerve
Main action: thumb extension
Extensor Indices
Origin: Posterior surface of ulna
Insertion: extensor hood of digit 2
Innervation: posterior interosseous nerve
Main actions: extension of digit 2
Supinator
(For supination pronation, radius bone that moves)
Origin: lateral epicondyle of humerus
Insertion: posterior proximal radius
Innervation: posterior interosseous nerve
Main action: radio-ulnar supination
Flexor Pollicis Brevis
(Third layer of forearm)
Origin: Flexor Retinaculum
Insertion: proximal phalanx of digit 1
Innervation: branch of median nerve
Main actions: thumb flexion
Abductor Pollicis Brevis
Origin: flexor retinaculum
Insertion: radial side of base of proximal phalanx
Innervation: branch of median nerve
Main action: thumb abduction
Opponens Pollicis
Origin: Flexor retinaculum
Insertion: Lateral side of the length of 1st metacarpal
Innervation: branch of median nerve
Main action: opposition of the thumb and other digits
Adductor Pollicis (Brevis)
Origin: oblique head and transverse head
Insertion: proximal phalanx of the thumb
Innervation: branch of ulnar nerve
Main action: adducts thumb
Abductor digiti Minimi
Origin: Pisiform
Insertion: base of the 5th proximal phalanx
Innervation: branch of ulnar nerve
Main action: abduction of 5th digit
Flexor Digiti Minimi Brevis
Origin: hamate
Insertion: base of 5th proximal phalanx
Innervation: branch of ulnar nerve
Main action: flexion of 5th digit
Opponens Digiti Minimi
Origin: Hamate
Insertion: Ulnar border of 5th metacarpal
Innervation: branch of ulnar nerve
Main action: opposition of 5th digit to thumb
Lumbricals (in palm)
Origin: tendons of flexor Digitorum profundus (anterior side)
Insertion: expansions of extensor digitorum (posterior side)
Innervation: median nerve and ulnar nerve
Main actions: flexion at the metacarpophalangeal joint while also extending the interphalangeal joints (hand writing position)
Dorsal Interossei (hand)
Origin: 2 metacarpals- 1st and 2nd metacarpals
Insertion: base of respective proximal phalanx
Innervation: branch of ulnar nerve
Main action: abduction of digits 2-4
Palmar Interossei (palm)
Origin: palmar surfaces of metacarpals 2, 4 and 5
Insertion: extensor expansion of the same digit (anterior —> posterior)
Innervation: branch of ulnar nerve
Main actions: adduction of digits 2, 4 and 5
