Session 2 - The Brachial Plexus 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
Q

What is the motor function of the median nerve?

A

Innervates most of the flexor muscles in the forearm

26
Q

What is 17?

What are its roots?

A

Radial Nerve

27
Q

What is the motor function of the radial nerve?

A
28
Q

What is 18?

What are its roots?

A

The ulnar nerve

Roots: C8 and T1

29
Q

What is the motor function of the ulnar nerve?

A

Innervates the muscles of the hand

30
Q

What can damage to the axillary nerve cause?

A

Loss of sensation in the regimental patch