2 - Brachial Plexua Flashcards

1
Q

What is the structure shown in the image?

A

The brachial plexus

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2
Q

What exactly is the brachial plexus?

A

A network of nerve fibres that run through the neck and axilla, into the arm.

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3
Q

What are the five divisions of the brachial plexus?

A

Read That Damn Cadaver Book

  • Roots
  • Trunk
  • Divisions
  • Cords
  • Branches
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4
Q

What is A?

A

Roots of brachial plexus

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5
Q

What do 1-5 represent?

A

The anterior fibres of spinal nerves C5, C6, C7, C8, T1 respectively

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6
Q

What is a distinctive feature of the components of A?

A
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7
Q

What is B?

A

The trunks

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8
Q

What is 6, and what is it a combination of?

A

Superior trunk: A combination of C5 and C6 roots.

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9
Q

What is 7?

A

Middle trunk: A continuation of C7.

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10
Q

What is 8?

A

Inferior trunk: A combination of C8 and T1 roots.

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11
Q

When are the trunks formed?

A

just before they enter the axilla through the axillary inlet (or apex)

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12
Q

What is C?

A

The divisions

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13
Q

What are 9 and 10?

A

9 - Anterior divisons 10 - Posterior divisions

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14
Q

What do the divisions leave us with?

A
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15
Q

What is D?

A

The cords

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16
Q

What are the sections of D formed by, and what are they named relative to?

A

The cords are formed by recombination of the six divisions to three nerve fibres They are named by their position relative to the brachial artery.

17
Q

What is 11 and what is it formed by?

A

Lateral cord (lateral to the brachial artery): Formed by… The anterior division of the superior trunk, The anterior division of the middle trunk

18
Q

What is 12?

A

Posterior cord (behind the brachial artery): Formed by…. The posterior division of the superior trunk The posterior division of the middle trunk The posterior division of the inferior trunk

19
Q

What is 13?

A

Medial cord (medial to the brachial artery): Formed by The anterior division of the inferior trunk.

20
Q

What is 14?

A

Musculocutaneous Nerve

21
Q

What are the roots of the Musculocutaneous Nerve? What are its motor functions?

A

Roots: C5, C6, C7 Motor Functions: Innervates the brachialis, biceps brachii and corocobrachialis muscles

22
Q

What is 15? What are its roots?

A

Axillary Nerve C5 and C6

23
Q

What is the motor function of the axillary nerve?

A

Innervates the deltoid, teres minor and the long head of the triceps brachii

24
Q

What is 16? What are its roots?

A

Median nerve Roots: C5 – C8 and T1

25
What is the motor function of the median nerve? 
Innervates most of the flexor muscles in the forearm
26
What is 17? What are its roots? 
Radial Nerve  
27
What is the motor function of the radial nerve? 
28
What is 18?  What are its roots?
The ulnar nerve Roots: C8 and T1    
29
What is the motor function of the ulnar nerve? 
Innervates the muscles of the hand
30
What can damage to the axillary nerve cause? 
Loss of sensation in the regimental patch