Cervical plexus and dermatomes of the neck (dave's notes) Flashcards

1
Q

How is the cervical plexus formed?

A

By simple loops between the anterior rami of the upper four cervical nerves after each has received a grey ramus from the superior cervical ganglion. This is continuous with the brachial plexus.

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2
Q

What type of nerves does the cervical plexus give off?

A

Muscular and cutaneous nerves, proprioceptive to trapezius

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3
Q

List the muscular nerves arising from the cervical plexus, their nerve roots, and what they supply

A
  • Muscular branches are given off segmentally to the prevertebral muscles
  • Hypoglossal nerve, C1, to thyrohyoid and geniohyoid
  • C2, C3 to SCM
  • C3, C4 to trapezius (proprioceptive)
  • Inferior root of ansa cervicalis
  • Phrenic nerve C4 (+ C3, C5)
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4
Q

List the cutaneous nerves of the cervical plexus. What is the gross region that they supply?

A
They supply the front and sides of the neck.
Lesser occipital
Great auricular
Transverse cervical
Supraclavicular
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5
Q

Describe the lesser occipital nerve

A

A slender branch hooking around the accessory nerve

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6
Q

Describe the great auricular nerve

A

A larger trunk supplying skin over the side of the face

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7
Q

Describe the supraclavicular nerve

A

The supraclavicular nerve emerges at the posterior border of SCM and divides into three main groups:

  • Medial skin down to the sternal angle
  • Intermediate as far down as the anterior axial line
  • Lateral skin half way down deltoid and the posterior aspect of the shoulder.
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8
Q

What supplies the sensory fibres to the skin of the neck

A

The greater occipital and third occipital from the posterior ramie are the sensory fibres

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9
Q

What supplies most of the posterior part of the neck, up to the scalp and forward to the auricle?

A

C2

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10
Q

What supplies the skin over the cylindrical part of the neck?

A

C3

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11
Q

What supplies the skin over the clavicular region across the top of the shoulder and down to the scapular spine?

A

C4

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12
Q

What skin does C2 supply?

A

Most of the posterior part of the neck, up to the scalp and forward to the auricle

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13
Q

What skin does C3 supply?

A

The skin over the cylindrical part of the neck

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14
Q

What skin does C4 supply

A

The skin over the clavicular region across the top of the shoulder and down to the scapular spine

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