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Anatomy - Arm > Forearm > Flashcards

Forearm Flashcards

1
Q

Radius orientation

A

lateral/thumb

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2
Q

Ulna orientation

A

medial/pinky

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3
Q

Elbow Joints

A
  • Hinge joint: ulna w/ humerus
  • Ball & socket: radius w/ humerus
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4
Q

Interosseus Membrane

A

Connective tissue between ulna and radius holding them together/in place, restricting movement.

Surface for forearm muscle attachments

Disperses force from hand (when supinated) equally from radius to ulna

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5
Q

Hand osteology - pollex

A

thumb

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6
Q

hand osteoology - indicis

A

fingers

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7
Q

hand osteology - digiti minimi

A

pinky

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8
Q

Arteries of Forearm

A
  • Brachial A. that splits to radial a. and ulnar a.
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9
Q

Branch from Radial A.

A

Radial recurrent A.

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10
Q

Branches from Ulnar A.

A
  • Common interosseous A.
  • Anterior interosseous A. (ultimately moves posterior)
  • Posterior interosseous A.
  • Recurrent interosseous A.
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11
Q

Forearm Nerves

A
  • Radial N: posterior innervation
  • Median N: lateral innervation
  • Ulnar N: medial innervation, NO branches
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12
Q

Median Nerve’s Branch

A

Anterior interosseous N

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13
Q

Radial Nerve’s Branches

A

1) superficial radial n.
2) deep radial n: passes the supinator m.

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14
Q

Forearm Compartments

A
  • Flexor Compartment (anterior)
    -Extensor Compartment (posterior)
  • Mobile Wad Compartment (lateral)
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15
Q

Forearm Flexors Orientation

A

Anterior and medial

Originate from medial side of distal humerus

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16
Q

Forearm Extensors Orientation

A

Posterior and lateral

Originate from lateral side of distal humerus

17
Q

Forearm Flexor Superficial Components

A
  • pronator teres m
  • flexor carpi radialis m
  • flexor carpi ulnaris m
  • palmaris longus m
18
Q

Forearm Flexor Intermediate Component

A
  • flexor digitorum superficialis m
19
Q

Forearm Flexor Deep Components

A
  • flexor pollicis longus m
  • flexor digitorum profundus m
20
Q

Pronator teres m

A
  • Attach: medial epicondyle of humerus and proximal ulna
  • Innervation: median n.
  • Action: forceful and rapid forearm pronation, weakly flexes elbow
21
Q

Flexor carpi radialis m

A
  • Attaches: medial epicondyle of humerus and ventral/lateral side of wrist
  • Innervations: Median N.
  • Actions: Flexes and aBducts wrist
22
Q

Flexor carpi ulnaris m

A
  • Attaches: medial epicondyle of humerus and medial/ventral side of wrist
  • Innervations: ULNAR N
  • Actions: flexes and aDducts wrist
23
Q

Palmaris Longus M

A
  • Attaches: medial epicondyle of humerus and flexor retinaculum and palmar aponeurosis
  • Innervations: median n
    -Actions: flexes wrist, tenses palmar aponeurosis

Frequently absent in certain populations

24
Q

Flexor digitorum superficialis m

A
  • Attaches: medial epicondyle of humerus, anterior radius (proximally), middle phalanges of DII-V
  • Innervation: median n.
  • Actions: flexes DII-V at first IP joints and MP joint, flexes wrist

Median N runs just deep to this muscle

25
Q

Flexor pollicis longus m

A
  • Attaches: interosseous membrane and anterior radius , distal phalanx of DI (thumb)
  • Innervation: anterior interosseous n.
  • Actions: flexes IP joint of DI (thumb)
26
Q

Flexor digitorum of profundus m

A

-Attaches: interosseous membrane and ulnar shaft, distal phalanges of DII-V
- Innervations: ulnar n and anterior interosseous n.
- Actions: flexes distal IP joints of DII-V and assists wrist flexion

27
Q

Flexor Retinaculum

A

Holds flexor tendons in place

28
Q

Carpal Tunnel

A

all tendons of flexor digitorum, superficialis, profundus, flexor pollicis longus t 3and median n

29
Q

Pronator quadraus m

A
  • Attaches: anterior surface of ulna and anterior surface of radius
  • Innervations: anterior interosseous n
  • Actions: pronates forearm
30
Q

Mobile Wad Components

A

Brachioradialis m, Extensor carpi radialis longus m and extensor carpi radialis brevis m

All located postolaterally

31
Q

Brachioradialis m

A
  • Attaches: distal humerus (lateral) and distal radius (lateral)
  • Innervations: superficial radial n.
  • superficial radial n. is deep to brachioradialis m
  • Actions: flexes elbow in (in neutral position)
32
Q

Extensor carpi radialis longus m and extensor carpi radialis brevis m

A
  • Attaches: lateral supracondylar ridge and epicondyle, doral and lateral side of wrist
  • Innervation: deep radial n
33
Q

Extensor Compartment Components

A

Anconius m, extensor carpi ulnaris m, extensor digitorium m, extensor digiti minimi m, extensor expansion, supinator m, and deep extensor muscles

34
Q
A

Anatomy - Arm (2 decks)

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