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Upper Limb ~ Anatomy > Ulnar Nerve > Flashcards

Ulnar Nerve Flashcards

1
Q

Root value of Ulnar Nerve;

A

C7, C8, T1

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2
Q

Root value of Ulnar Nerve supplying the Muscles of Palm;

A

C8, T1 {anterior division of lower trunk}

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3
Q

C7 fibres from Lateral Cord Supplies;

A
  • Medial 1/2 of Flexor digitorum profundus

* Flexor carpi ulnaris

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4
Q

Course of Ulnar Nerve;

A

Passes behind the Medial Epicondyle of humerus →

Enters forearm →

Passes between FDP and FCU muscles →

Enters the Palm above Flexor Retinaculum →

Lies in the Guynon’s canal

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5
Q

What are the branches of Ulnar nerve in the Palm?

A
  • Superficial Branch (Sensory)

* Deep Branch (Motor branch)

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6
Q

Deep branch of Ulnar nerve supplies;

A

All muscles of Palm Except LOAF muscles

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7
Q

L O A F muscle;

A

L - Lateral 2 Lumbricals

O - Opponens pollicis

A - Abductor pollicis brevis

F - Flexor pollicis brevis

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8
Q

Superficial branch of Ulnar Nerve supplies;

A
  • Palmaris brevis

* Medial 1 and 1/2 digits

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9
Q

What is Pollock’s sign?

A

Loss of Flexion of Interphalangeal joints of medial two-fingers

Due to Ulnar nerve injury → FDP Tendon to medial half is paralysed

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10
Q

What is Wartenberg Sign?

A

Loss of addiction of Fifth digit (Palmar interossei adduction)

Due to Ulnar nerve injury

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11
Q

What is Wartenberg Syndrome?

A

Injury to Superficial Branch of Radial Nerve

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12
Q

What is Froment sign / Froment Test ?

A

To test adductor pollicis

Positive test shows → Compensatory flexion at their Phalangeal Joint of thumb

Due to Flexor pollicis longus, supplied by Anterior Interosseous nerve - branch of Median Nerve

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13
Q

Signs of Ulnar Injury;

A

Pollock’s sign
Wartenberg sign
Froment sign/Froment test

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14
Q

Lumbricals number

A

4 in Number;

From lateral to medial

1st and 2nd → Unipennate

3rd and 4th → Bipennate

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15
Q

Unipennate Lumbricals are supplied by;

A

1st and 2nd by Median Nerve

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16
Q

Bipennate Lumbricals are supplied by;

A

3rd and 4th → by Deep branch of Ulnar nerve

17
Q

Lumbrical muscles;

Origin -

Insertion -

A

Origin - FDP tendon

Insertion - Dorsal digital expansion (extensor tendon)

18
Q

Action of Lumbrical Muscles;

A

Had 2 Action;

  • Flexion of Metacarpophalangeal Joint
  • Extension of Interphalangeal Joint
19
Q

Palmar Interossei Action

A
  • Addiction of Fingers
  • Flexion of MCP Joint
  • Extension of IP Join
20
Q

Finger without Palmar interossei attachment;

A

Middle finger

Because it is already in adducted position

21
Q

Action of Dorsal Interossei

A

Abduction of Fingers

Flexion of MCP Joint

Extension of IP Joint

22
Q

Metacarpal with no attachment of Dorsal Interossei

A

1st and 5th Metacarpals

23
Q

Dorsal interossei is supplied by

A

Deep branch of Ulnar nerve

24
Q

Anterior boundary of Midpalmar space;

A
  • Palmar aponeurosis
  • Superficial palmar arch
  • FDS and FDP tendons to 3, 4, 5 fingers
  • Ulnar bursa
  • 2, 3, 4 - Lumbricals
25
Q

Posterior boundary of Midpalmar space;

A
  • 3rd, 4th, 5th Metacarpal bone

* Fascia over the Interosseous muscles

26
Q

Medial and Lateral boundaries of Midpalmar space;

A

Medially - Medial palmar septum

Laterally- Intermediate palmar septum

27
Q

Midpalmar space extends upto;

Proximally -

Distally -

A

Proximally - extend upto Space of Parona

Distally - extend up to 2nd, 3rd, 4th Web space through 2nd, 3rd, 4th Lumbrical canal

28
Q

Thenar space extends upto;

Proximally -

Distally -

A

Proximally - extend upto Space of Parona

Distally - communicating with 1st Web space through 1st Lumbrical canal

29
Q

Thenar space; Anterior Boundary

A
  • Palmar aponeurosis
  • Radial Bursa (around Flexor pollicis longus)
  • FDP and FDS tendons to 2nd Metacarpal
  • 1st Lumbrical (taking origin from FDP tendon to Index finger)
30
Q

Thenar space; Posterior Boundary

A

Oblique head of Adductor pollicis (from 3rd Metacarpal)

31
Q

Thenar space; Medial and Lateral Boundary

A

Medially - Intermediate Palmar Septum

Laterally- Lateral Palmar Septum

32
Q

Infection from the Index finger spread to which space of palm?

A

Thenar space

Upper Limb ~ Anatomy (9 decks)

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