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Anatomy 2 > Antebrachial Extensors > Flashcards

Antebrachial Extensors Flashcards

1
Q

Lister’s tubercle

A
  • on dorsal distal radius
  • pulley (changes muscle direction/angle) for extensor pollicis longus tendon
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2
Q

Carpals

A
  • proximal: scaphoid, lunate, triquetrum, pisiform
  • distal: trapezium, trapezoid, capitate, hamate
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3
Q

Distal Radioulnar Joint (DRUJ)

A
  • synovial, pivot (uniaxial)
  • pronation, supination
  • supporting ligaments = volar and dorsal radioulnar ligaments
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4
Q

Radiocarpal Joint

A
  • radius + scaphoid & lunate
  • synovial, ellipsoid (biaxial)
  • wrist flexion, extension, radial deviation, ulnar deviation
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5
Q

Midcarpal Joint

A
  • interaction b/w proximal and distal carpal bones to perform global wrist and hand movements
  • synovial, ellipsoid (biaxial)
  • wrist flexion, extension, radial deviation, ulnar deviation, circumduction
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6
Q

Triangular Fibrocartilage Complex (TFCC)

A
  • cushion b/w distal ulna and carpals
  • stability on ulnar side of wrist
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7
Q

Carpometacarpal Joints (CMC)

A
  • carpals + metacarpals
  • gliding
  • volar/dorsal gliding
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8
Q

Metacarpophalangeal Joints (MCP)

A
  • metacarpals + phalanges
  • synovial, ellipsoid (biaxial)
  • finger flexion, extension, abduction, adduction
  • flexion = volar gliding
  • extension = dorsal gliding
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9
Q

Interphalangeal Joints (IP)

A
  • b/w phalanges
  • synovial, hinge (uniaxial)
  • finger flexion, extension
  • proximal (PIP) and distal (DIP)
  • thumb only has 1 … IP
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10
Q

Carpometacarpal Joint (CMC) of Thumb

A
  • trapezium + 1st metacarpal
  • synovial, saddle (biaxial)
  • thumb flexion, extension, abduction, adduction
  • basilar joint
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11
Q

Arterial Supply

A

ulnar artery > common interosseous a. > splits into posterior and anterior interosseous arteries
- posterior interosseous a. runs through aperture of interosseous membrane

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12
Q

Intrinsic vs Extrinsic Muscles

A
  • extrinsic = originate proximal to wrist, generate greater force
  • intrinsic = contained entirely w/in hand, precise control
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13
Q

Superficial Layer of Extrinsic Extensor Muscles

A
  • extensor carpi radialis longus
  • extensor carpi radialis brevis
  • extensor digitorum
  • extensor digiti minimi
  • extensor carpi ulnaris
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14
Q

Deep Layer of Extrinsic Extensor Muscles

A
  • extensor indicis
  • supinator
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15
Q

Outcropping Layer of Extrinsic Extensor Muscles

A
  • abductor pollicis longus
  • extensor pollicis longus
  • extensor pollicis brevis
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16
Q

Tennis Elbow

A
  • ECRL and ECRB
  • inflammation of periosteium at lateral epicondyle
  • pain w/ gripping, opening a heavy door, lifting a glass
  • lateral epicondylitis = acute, inflammation, hot, swelling
  • epicondylosis = chronic, degeneration, no swelling
17
Q

Rule of 2’s

A
  • wrist flexors = FCR, FCU
  • wrist extensors = ECRL, ECRB, ECU
  • radial deviators = FCR, ECRL, ECRB
  • ulnar deviators = FCU, ECU
18
Q

Anatomical Snuffbox

A

boundaries formed by tendons of abductor pollicis longus, extensor pollicis brevis, and extensor pollicis longus

19
Q

Extensor Retinaculum

A

thick sheath that covers and keeps extensor tendons in place and separates them into 6 compartments

20
Q

6 Dorsal Compartments of the Wrist

A

1 - APL, EPB
2 - ECRL, ECRB
3 - EPL
4 - ED, EI
5 - EDM
6 - ECU

21
Q

De Quervain’s Tenosynovitis

A
  • “texting thumb”
  • cumulative trauma disorder of tendons of 1st dorsal compartment (APL, EPB)
  • common w/ new mothers, repetitive keystrokes, gaming
22
Q

Tenodesis

A
  • passive finger flexion created by active wrist extension
  • functional grip for individuals w/ paralysis of finger flexors
  • ex: SCI at C6 level
23
Q

Distal Radius Fracture

A
  • smith’s fracture = volar displacement of distal bone, inward
  • colles’ fracture = dorsal displacement of distal bone, outward
24
Q

Scaphoid Fracture

A
  • most commonly fractured carpal bone
  • from a FOOSH injury (fall on outstretched hand)
  • can lead to a necrotic proximal fragment due to loss of blood supply from radial artery

Anatomy 2 (11 decks)

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