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Upper Limb ~ Anatomy > Median Nerve & Cubital Fossa > Flashcards

Median Nerve & Cubital Fossa Flashcards

1
Q

Median nerve is formed by

A

Two roots;

Medial root (Medial cord)
Lateral root (Lateral cord)
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2
Q

Median nerve is crossing the brachial artery from which side

A

From the lateral side to the Medial side

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3
Q

Most medial structure of Cubital Fossa;

A

Median Nerve

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4
Q

How Median nerve enters the Forearm?

And it supplies?

A

By passing between the Heads of Pronator teres muscle

Supplies the Flexors of Forearm

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5
Q

List Superficial Flexors of Forearm;

A
  1. Pronator teres
  2. Flexor carpi radialis
  3. Palmaris longus
  4. Flexor carpi ulnaris
  5. Flexor digitorum superficialis
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6
Q

Superficial flexors of forearm takes origin from;

A

Medial Epicondyle

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7
Q

Action of Pronator teres;

A

Pronation

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8
Q

Action of Flexor carpi radialis;

A
  • Flexion of Wrist

- Radial Deviation

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9
Q

Action of Palmaris longus;

Its continuation in the palm as

A

Flexion of Wrist

As Palmar Aponeurosis

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10
Q

Action of Carpi Ulnaris;

A
  • Flexion of wrist

- Ulnar deviation

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11
Q

Attachment and Action of Flexor digitorum superficialis;

A

It is attached upto Middle phalanx

Flexion of →

  • Wrist
  • MCP Joint
  • Proxima IP Joint
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12
Q

Median Nerve directly supplies only Four Muscles;

A

Pronator teres
Flexor carpi radialis
Palmaris longus
Flexor digitorum superficialis

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13
Q

Anterior Interosseus Nerve (branch of Median Nerve) supplies;

A

2 1/2 Muscles;

  • Pronator Quadratus
  • Flexor policis longus
  • Lateral 1/2 of Flexor digitorum profundus
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14
Q

List Deep flexors of forearm;

A
  1. Flexor digitorum profundus
  2. Flexor policis longus
  3. Pronator quadratus
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15
Q

Action of Flexor digitorum profundus;

A

Flexion of →

  • Wrist
  • MCP Joint
  • Proximal and Distal IP Joint
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16
Q

Lumbrical muscles take origin from ←

A

Tendon of Flexor digitorum profundus

17
Q

Ulnar nerve supplies;

A

1 1/2 Muscles in the forearm;

Flexor carpi ulnaris (superficial)

Medial 1/2 of Flexor digitorum profundus (deep)

18
Q

What is Gantzers muscle

A

In some pateints;

If Flexor pollicis longus have an Accessory Head → called as Accessory Head of Flexor Pollicis Longus
AHFPL

19
Q

If AHFPL is present it compresses →

A

Anterior Interosseous Nerve

20
Q

Jersey finger is due to

A

Avulsion of Flexor digitorum profundus (FDP) tendon

→ causes loss of flexion of Distal IP Joint

Caused by Violent traction on flexed distal phalanx, as in catching on jersey of running football player

21
Q

Median nerve enters the palm by passing

A

Below the Retinaculum

22
Q

Median nerve in the palm is divided into

A

Medial and Lateral Branch

23
Q

Before dividing Median nerve gives one Motor Branch →

And it supplies →

A

Recurrent Branch

Supplies → Thenar Eminence Muscles

24
Q

The branch of median nerve passing above the Flexor Retinaculum and it Supplies

A

Palmar branch of Median Nerve

Gives sensory supply to Thenar Eminence

25
Q

Proper Palmar Digital Branch supplies;

A

Sensory Supply to

  • Lateral 3 1/2 digits on the Palmar side
  • Distal and Middle Phalanx of the lateral 3 1/2 digits
26
Q

Supination of Forearm done by;

A

Supinator → supplied by Posterior Interosseous nerve

Biceps brachii → Supplied by Musculocutaneous nerve

27
Q

MC affected nerve in Wrist Slash Injury;

A

Median Nerve

Due to inflicted cut in the distal forearm (wrist regoin)

28
Q

Intact muscles and functions in Wrist slash injury;

A
  • All the forearm flexors which are supplied by Median Nerve will be Normal
  • On Wrist flexion - no ulnar deviation
  • Pronation not affected
  • FDP Lateral 1/2 and FDS →

No Benediction hand deformity
No Pointing index finger

29
Q

Function lost in Wrist slash injury;

A

LOAF Muscles paralysed →
atrophy of the thenar muscle →
Ape thumb deformity

Loss of sensation over the Lateral 3 1/2 digits + Thenar eminence

30
Q

Compression of Median nerve while passing below the Flexor Retinaculum → result into

A

Carpal tunnel syndrome

Features are same as Wrish slash injury except → Sensory supply over Thenar Eminence is Normal

31
Q

Why in carpal tunnel syndrome sensation over Thenar Eminence is normal

A

Because Palmar Cutaneous branch of Median Nerve passes above the Flexor Retinaculum

32
Q

Boundaries of Cubital Fossa;

Medially -

Laterally -

Apex -

Base -

A

Medially - lateral border of Pronator teres

Laterally - medial border of Brachioradialis

Apex - meeting point of brachioradialis and pronator teres

Base - imaginary line connecting the two Epicondyle

33
Q

Roof of Cubital Fossa is formed by

A
  • Bicipital aponeurosis- derided from biceps tendon

* Median cubital vein

34
Q

Floor of Cubital fossa is formed by

A
  • Brachialis muscle

* Supinator muscle

35
Q

Contents of Cubital Fossa -

M

B

B

S

A

M- Medial nerve

B- Brachial artery

B- Biceps tendon

S- Superficial branch of Radial Nerve

Upper Limb ~ Anatomy (9 decks)

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