Wrist & Fingers Flashcards
Muscle Attachments
Flexor Carpi Radialis
O - Medial epicondyle of humerus (common flexor origin)
I - Base of second metacarpal
Palmaris Longus
O - Medial epicondyle of humerus (common flexor origin)
I - Distal-half of flexor retinaculum, and apex of palmar aponeurosis
Flexor Carpi Ulnaris
O - Humeral Head: medial epicondyle of humerus (common flexor origin); Ulnar Head: olecranon & posterior surface via aponeurosis
I - Pisiform, hook of hamate, and base of fifth metacarpal
Flexor Digitorum Superficialis
O - Humeroulnar Head: medial epicondyle of humerus (common flexor origin), and coronoid process of ulna; Radial Head: superior half of anterior border of radius
I - Shafts of middle phalanges of the 4 medial digits
Flexor Policis Longus
O - Anterior surface of radius, and interosseus membrane
I - Base of distal phalanx of thumb
Flexor Digitorum Profundus
O - Proximal 3/4 of medial and anterior surfaces of ulna, and interosseus membrane
I - Medial Head: bases of distal phalanges of 4th & 5th digits; Lateral Head: bases of distal phalanges of 2nd & 3rd digits
Pronator Quadratus
O - Distal quarter of anterior ulnar shaft
I - Distal quarter of anterior radial shaft
Extensor Carpi Radialis Longus
O - Lateral supraepicondylar ridge of humerus
I - Dorsal aspect of base of second metacarpal
Extensor Carpi Radialis Brevis
O - Lateral epicondyle of humerus (common extensor origin)
I - Dorsal aspect of base of third metacarpal
Extensor Digitorum
O - Lateral epicondyle of humerus (common extensor origin)
I - Distal phalanges of fingers 2-5 via tendon-extension
Extensor Carpi Ulnaris
O - Lateral epicondyle of humerus, and posterior border of ulna via shared aponeurosis
I - Dorsal aspect of base of fifth metacarpal
Abductor Pollicis Longus
O - Posterior surface of middle-halves of radius, ulna, and interosseus membrane
I - Base of first metacarpal and trapezium
Extensor Pollicis Brevis
O - Posterior surface of distal-third of radius and interosseus membrane
I - Dorsal aspect of base of proximal phalanx of thumb
Extensor Pollicis Longus
O - Posterior surface of middle-third of ulna and interosseus membrane
I - Dorsal aspect of base of distal phalanx of thumb
Extensor Indicis
O - Posterior surface of distal-third of ulna, and interosseus membrane
I - Distal phalanx of second digit via tendon-expansion
Abductor Pollicis Brevis
O - Flexor retinaculum and tubercles of scaphoid and trapezium
I - Lateral base of thumb’s proximal phalanx
Flexor Pollicis Brevis
O - Flexor retinaculum and tubercles of scaphoid and trapezium
I - Lateral base of proximal phalanx of thumb
Opponens Pollicis
O - Flexor retinaculum and tubercles of scaphoid and trapezium
I - Lateral side of first metacarpal
Adductor Pollicis
O - Oblique Head: bases of 2nd and 3rd metacarpals, capitate, and adjacent carpals; Transverse Head: anterior surface of shaft of 3rd metacarpal
I - Medial base of proximal phalanx of thumb
Abductor Digiti Minimi
O - Pisiform bone
I - Medial side of proximal phalanx of little finger
Flexor Digiti Minimi Brevis
O - Hook of hamate bone, and flexor retinaculum
I - Medial side of proximal phalanx of little finger
Opponens Digiti Minimi
O - Hook of hamate bone, and flexor retinaculum
I - Medial side of fifth metacarpal
Lumbricals
O - 1st & 2nd: flexor digitorum profundus, as unipennate muscles; 3rd & 4th: flexor digitorum profundus, as bipennate muscles
I - Lateral sides of extensor expansions of digits 2-5
Palmar Interossei
O - Palmar surfaces of 2nd, 4th, and 5th metacarpals, as unipennate muscles
I - Bases of proximal phalanges, and 2nd, 4th, and 5th digits (distal) via tendon-expansion
Dorsal Interossei
O - Adjacent sides of two metacarpals, as bipennate muscles
I - Bases of proximal phalanges, and 2nd-4th digits (distal) via tendon-expansion
Extensor Digiti Minimi
O - Lateral epicondyle of humerus (common extensor origin)
I - Extensor expansion of 5th digit (i.e. middle and distal phalanges of digit)
Palmaris Brevis
O - medial portion of palmar aponeurosis + flexor retinaculum
I - skin in hypothenar region
What are the compartments of the hand?
Thenar Hypothenar Central Adductor Interosseus
