Myotomes and Dermatomes Quiz
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Questions and Answers

C6 is responsible for _______ extension and elbow flexion.

wrist

The _______ toe extension is associated with L5.

great

The normal range of shoulder _______ is 180º.

flexion

T1 is associated with _______ abduction and hand intrinsics.

<p>finger</p> Signup and view all the answers

The normal range of elbow _______ is 140º.

<p>flexion</p> Signup and view all the answers

C7 is responsible for _______ extension and wrist flexion.

<p>elbow</p> Signup and view all the answers

The normal range of cervical _______ is 45º.

<p>flexion</p> Signup and view all the answers

S1 is associated with _______ flexion.

<p>ankle</p> Signup and view all the answers

What spinal level is responsible for cervical flexion?

<p>C1/C2</p> Signup and view all the answers

Which dermatome is associated with the little finger?

<p>C8</p> Signup and view all the answers

What is the normal range of ankle dorsiflexion?

<p>20º</p> Signup and view all the answers

Which spinal level is associated with hip flexion?

<p>L1/L2</p> Signup and view all the answers

What is the normal range of shoulder internal rotation?

<p>70º</p> Signup and view all the answers

Which dermatome is associated with the medial forearm and arm?

<p>T1</p> Signup and view all the answers

What is the normal range of wrist flexion?

<p>80º</p> Signup and view all the answers

Which spinal level is associated with great toe extension?

<p>L5</p> Signup and view all the answers

Study Notes

Myotomes

  • C1/C2 myotomes are responsible for cervical flexion
  • C3 myotomes control lateral cervical flexion
  • C4 myotomes facilitate shoulder elevation
  • C5 myotomes enable shoulder flexion and abduction
  • C6 myotomes control wrist extension and elbow flexion
  • C7 myotomes allow elbow extension and wrist flexion
  • C8 myotomes facilitate finger flexion and thumb extension
  • T1 myotomes control finger abduction and hand intrinsics
  • L1/L2 myotomes facilitate hip flexion
  • L3 myotomes enable knee extension
  • L4 myotomes control ankle dorsiflexion (DF)
  • L5 myotomes facilitate great toe extension
  • S1 myotomes control ankle plantar flexion (PF)

Dermatomes

  • C6 dermatomes innervate the thumb
  • C7 dermatomes innervate the middle finger
  • C8 dermatomes innervate the little finger
  • T1 dermatomes innervate the anteromedial forearm and arm
  • T2 dermatomes innervate the medial forearm to axilla
  • T4 dermatomes innervate the nipple
  • T6 dermatomes innervate the xiphoid process
  • T10 dermatomes innervate the umbilicus
  • L3 dermatomes innervate the medial knee
  • L4 dermatomes innervate the anterior knee and medial malleolus
  • L5 dermatomes innervate the dorsal foot and toes 1-3
  • S1 dermatomes innervate the lateral malleolus

ROM Normative Values

  • Shoulder flexion (FLX) has a normal range of 180º
  • Shoulder extension (EXT) has a normal range of 60º
  • Shoulder abduction (ABD) has a normal range of 180º
  • Shoulder adduction (ADD) has a normal range of 30º
  • Shoulder internal rotation (IR) has a normal range of 70º
  • Shoulder external rotation (ER) has a normal range of 90º
  • Elbow flexion (FLX) has a normal range of 140º
  • Elbow extension (EXT) has a normal range of 0º
  • Wrist flexion (FLX) has a normal range of 80º
  • Wrist extension (EXT) has a normal range of 70º
  • Wrist pronation (PRO) has a normal range of 80º
  • Wrist supination (SUP) has a normal range of 80º
  • Wrist ulnar deviation (UD) has a normal range of 30º
  • Wrist radial deviation (RD) has a normal range of 20º
  • Metacarpophalangeal (MCP) flexion has a normal range of 90º
  • MCP extension has a normal range of 45º
  • Hip flexion (FLX) has a normal range of 120º
  • Hip extension (EXT) has a normal range of 30º
  • Hip abduction (ABD) has a normal range of 45º
  • Hip adduction (ADD) has a normal range of 30º
  • Hip internal rotation (IR) has a normal range of 45º
  • Hip external rotation (ER) has a normal range of 45º
  • Knee flexion (FLX) has a normal range of 135º
  • Knee extension (EXT) has a normal range of 0º
  • Ankle dorsiflexion (DF) has a normal range of 20º
  • Ankle plantar flexion (PF) has a normal range of 50º
  • Ankle inversion (INV) has a normal range of 35º
  • Ankle eversion (EV) has a normal range of 15º
  • Subtalar joint (STJ) inversion has a normal range of 20º
  • STJ eversion has a normal range of 10º
  • First metatarsophalangeal (MPJ) flexion has a normal range of 30º
  • First MPJ extension has a normal range of 70º
  • Cervical flexion has a normal range of 45º
  • Cervical extension has a normal range of 45º
  • Cervical lateral flexion has a normal range of 30º
  • Cervical rotation has a normal range of 80º
  • Thoracic flexion has a normal range of 90º
  • Thoracic extension has a normal range of 30º
  • Thoracic lateral flexion has a normal range of 30º
  • Thoracic rotation has a normal range of 30º
  • Lumbar flexion has a normal range of 60º
  • Lumbar extension has a normal range of 25º
  • Lumbar lateral flexion has a normal range of 25º
  • Lumbar rotation has a normal range of 18º

Myotomes

  • C1/C2 myotomes are responsible for cervical flexion
  • C3 myotomes control lateral cervical flexion
  • C4 myotomes facilitate shoulder elevation
  • C5 myotomes enable shoulder flexion and abduction
  • C6 myotomes control wrist extension and elbow flexion
  • C7 myotomes allow elbow extension and wrist flexion
  • C8 myotomes facilitate finger flexion and thumb extension
  • T1 myotomes control finger abduction and hand intrinsics
  • L1/L2 myotomes facilitate hip flexion
  • L3 myotomes enable knee extension
  • L4 myotomes control ankle dorsiflexion (DF)
  • L5 myotomes facilitate great toe extension
  • S1 myotomes control ankle plantar flexion (PF)

Dermatomes

  • C6 dermatomes innervate the thumb
  • C7 dermatomes innervate the middle finger
  • C8 dermatomes innervate the little finger
  • T1 dermatomes innervate the anteromedial forearm and arm
  • T2 dermatomes innervate the medial forearm to axilla
  • T4 dermatomes innervate the nipple
  • T6 dermatomes innervate the xiphoid process
  • T10 dermatomes innervate the umbilicus
  • L3 dermatomes innervate the medial knee
  • L4 dermatomes innervate the anterior knee and medial malleolus
  • L5 dermatomes innervate the dorsal foot and toes 1-3
  • S1 dermatomes innervate the lateral malleolus

ROM Normative Values

  • Shoulder flexion (FLX) has a normal range of 180º
  • Shoulder extension (EXT) has a normal range of 60º
  • Shoulder abduction (ABD) has a normal range of 180º
  • Shoulder adduction (ADD) has a normal range of 30º
  • Shoulder internal rotation (IR) has a normal range of 70º
  • Shoulder external rotation (ER) has a normal range of 90º
  • Elbow flexion (FLX) has a normal range of 140º
  • Elbow extension (EXT) has a normal range of 0º
  • Wrist flexion (FLX) has a normal range of 80º
  • Wrist extension (EXT) has a normal range of 70º
  • Wrist pronation (PRO) has a normal range of 80º
  • Wrist supination (SUP) has a normal range of 80º
  • Wrist ulnar deviation (UD) has a normal range of 30º
  • Wrist radial deviation (RD) has a normal range of 20º
  • Metacarpophalangeal (MCP) flexion has a normal range of 90º
  • MCP extension has a normal range of 45º
  • Hip flexion (FLX) has a normal range of 120º
  • Hip extension (EXT) has a normal range of 30º
  • Hip abduction (ABD) has a normal range of 45º
  • Hip adduction (ADD) has a normal range of 30º
  • Hip internal rotation (IR) has a normal range of 45º
  • Hip external rotation (ER) has a normal range of 45º
  • Knee flexion (FLX) has a normal range of 135º
  • Knee extension (EXT) has a normal range of 0º
  • Ankle dorsiflexion (DF) has a normal range of 20º
  • Ankle plantar flexion (PF) has a normal range of 50º
  • Ankle inversion (INV) has a normal range of 35º
  • Ankle eversion (EV) has a normal range of 15º
  • Subtalar joint (STJ) inversion has a normal range of 20º
  • STJ eversion has a normal range of 10º
  • First metatarsophalangeal (MPJ) flexion has a normal range of 30º
  • First MPJ extension has a normal range of 70º
  • Cervical flexion has a normal range of 45º
  • Cervical extension has a normal range of 45º
  • Cervical lateral flexion has a normal range of 30º
  • Cervical rotation has a normal range of 80º
  • Thoracic flexion has a normal range of 90º
  • Thoracic extension has a normal range of 30º
  • Thoracic lateral flexion has a normal range of 30º
  • Thoracic rotation has a normal range of 30º
  • Lumbar flexion has a normal range of 60º
  • Lumbar extension has a normal range of 25º
  • Lumbar lateral flexion has a normal range of 25º
  • Lumbar rotation has a normal range of 18º

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Test your knowledge of myotomes and dermatomes, including their corresponding spinal nerves and muscle functions.

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