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Questions and Answers
What area does C3/C4 correspond to?
What area does C3/C4 correspond to?
Which area is associated with C5?
Which area is associated with C5?
C6 is associated with which body parts?
C6 is associated with which body parts?
Which fingers does C7 correspond to according to Keegan & Garrett?
Which fingers does C7 correspond to according to Keegan & Garrett?
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What does C8 correspond to?
What does C8 correspond to?
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T1 corresponds to which areas according to Keegan & Garrett?
T1 corresponds to which areas according to Keegan & Garrett?
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What region is associated with T2?
What region is associated with T2?
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Which dermatomes correspond to T3/T4?
Which dermatomes correspond to T3/T4?
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What is the basis of Foerster's dermatome map?
What is the basis of Foerster's dermatome map?
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The dermatome map by Keegan & Garrett is based on work from which year?
The dermatome map by Keegan & Garrett is based on work from which year?
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What does C4 correlate to?
What does C4 correlate to?
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Study Notes
Upper Extremity Dermatomes
- C3/C4: Innervates the base of the neck and extends laterally over the shoulder.
- C5: Covers the lateral aspect of the arm, particularly the superior aspect when the arm is abducted.
- C6: Responsible for sensation in the lateral forearm and thumb, extending to the lateral aspect of the index finger according to Foerster.
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C7:
- According to Keegan & Garrett: affects the index and middle fingers, medial aspect of the palm, middle lateral posterior arm.
- Foerster's definition includes the medial aspects of the index and ring fingers, middle finger, and the medial palm and forearm up to the cubital fossa.
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C8:
- According to Keegan & Garrett: includes the ring and little fingers, medial aspect of both anterior and posterior forearm, extending to a segment of the upper back.
- Foerster classifies it as affecting the lateral aspect of the ring finger, little finger, and medial forearm.
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T1:
- According to Keegan & Garrett: involves the anterior inferiomedial quarter of the abducted arm, segments of the upper chest, axilla, and upper back.
- Foerster describes it as affecting the medial aspect of the middle third of the arm from the proximal antebrachium to distal brachium.
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T2:
- Keegan & Garrett's identification includes a segment of the axilla, upper pectoral region, and upper back.
- Foerster delineates it as covering the proximal half of the arm, segment of the pectoral region, and upper back.
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T3/T4:
- Keegan & Garrett recognize segments of the axilla, pectoral region, and upper back.
- Foerster's map similarly covers the axilla and segments of the pectoral region and upper back.
- Foerster: Dermatome map created by Foerster in 1933, detailing sensory distribution.
- Keegan & Garrett: Dermatome map established by Keegan & Garrett in 1948, providing comprehensive sensory maps.
- C4: Focuses on the lateral aspect of the superior shoulder, serving as another key area of sensory distribution in the upper extremity.
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Description
Test your knowledge on the dermatomes of the upper extremity with this quiz. Each question covers specific dermatome regions, focusing on their corresponding spinal nerve roots. Perfect for students in anatomy or healthcare fields.
