Wrist & Hand Flashcards
Flexor pollicis longus
O: Mid anterior surface of radius, and interosseous membrane
I: Palmar surface of distal phalanx of thumb
A: Wrist flexion and abduction
MCP and IP I flexion
CMC I flexion
In: Median n. (C8, T1)
Abductor pollicis longus
O: Dorsal surface of radius (proximal half), ulna, and interosseous membrane
I: Base of metacarpal I
A: CMC I abduction and extension
Assist wrist abduction (and flexion)
In: Radial n. (C7, C8)
Extensor pollicis brevis
O: Dorsal surface of radius (distal third), and interosseous membrane
I: Posterior surface of base of proximal phalanx of thumb
A: CMC and MCP I extension
Assist wrist extension and abduction
In: Radial n. (C7, C8)
Extensor pollicis longus
O: Dorsal surface of ulna (middle third), and interosseous membrane
I: Posterior surface of base of distal phalanx of thumb
A: MCP and IP I extension
CMC I adduction
Assist wrist extension, abduction, (and supination)
In: Radial n. (C7, C8)
Extensor digiti minimi
O: Lateral epicondyle of humerus (common extensor tendon)
I: Extensor expansion of digit 5
A: MCP, PIP, DIP V extension (and abduction)
Assist wrist extension (and ulnar deviation)
In: Radial n. (C7, C8)
Extensor indicis
O: Dorsal surface of ulna (distal third), and interosseous membrane
I: Extensor expansion of 2nd digit
A: MCP, IP, and DIP II extension
Assist wrist extension
In: Radial n. (C7, C8)
Abductor pollicis brevis (Thenar muscles)
O: Tubercle of scaphoid and trapezium, and flexor retinaculum
I: Lateral surface of base of proximal phalanx (via radial sesamoid bone)
A: CMC I (thumb) abduction
In: Median n. (C8, T1)
Adductor pollicis (Thenar muscles)
O: Transverse head: palmar base of 3rd MC
Oblique head: capitate, and palmar base of 2nd and 3rd MC
I: Medial base of proximal phalanx 1 (via ulnar sesamoid bone)
A: CMC I adduction and assist opposition
In: Ulnar n. (C8, T1)
Flexor pollicis brevis (Thenar muscles)
O: Superficial head: flexor retinaculum, and tubercle of trapezium bone
Deep head: capitate and trapezoid
I: Lateral surface of base of proximal phalanx 1 (via radial sesamoid bone)
A: CMC and MCP I flexion and assist opposition
In:
Sup. h.: median n. (C8, T1)
Deep h.: ulnar n. (C8, T1)
Opponens pollicis (Thenar muscles)
O: Tubercle of trapezium, and flexor retinaculum
I: Radial border of metacarpal I
A: CMC I opposition
In: Median n. (C8, T1)
Abductor digiti minimi (Hypothenar m.)
O: Pisiform
I: Ulnar base of proximal phalanx of digit 5, and extensor expansion of digit 5
A: MCP V abduction and flexion
IP V extension
In: Ulnar n. (C8, T1)
Palmaris brevis
O: Palmar aponeurosis, and flexor retinaculum
I: Skin of hypothenar eminence
A: Tightens palmar aponeurosis (protective function), tightens grip
In: Ulnar n. (C8, T1)
Opponens digiti minimi (Hypothenar m.)
O: Hook of hamate, and flexor retinaculum
I: Ulnar aspect of MC V
A: CMC V opposition and flexion
In: Ulnar nerve (C8, T1)
Flexor digiti minimi
O: Hook of hamate, and flexor retinaculum
I: Base of proximal phalanx of digit V
A: MCP V flexion (and opposition)
In: Ulnar n. (C8, T1)
Lumbricals I-IV
O: Tendons of flexor digitorum profundus m.
I: Dorsal digital expansion
In: Ulnar and median n.
A: MCP II-V flexion
IP II-V extension
In: I-II Median n. (C8, T1)
III-IV Ulnar n. (C8, T1)
Interossei dorsalis I-IV
O: Metacarpal I-V (adjacent sides, two heads)
I: Dorsal digital expansion of digit II-IV, and base of proximal phalanx II-IV
A: MCP II-IV flexion
IP II-IV: extension and abduction
In: Ulnar n. (C8, T1)
Interossei palmares I-III
O: Ulnar side of MC II, IV and V
I: Dorsal digital expansion, and base of proximal phalanx of the associated finger
A: MCP II, IV and V flexion
IP II, IV and V extension and adduction
In: Ulnar n. (C8, T1)
Anatomical snuff box
Composed by 3 tendons:
- Extensor pollicis longue
- Extensor pollicis brevis
- abductor pollicis longus
The anatomical snuff box contains:
- the radial nerve
- artery
- the cephalic vein
