Dermatomes

Dermatomes

Assessment

Interactive Video

Health Sciences, Biology

University

Hard

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The video tutorial by Dr. Morton explores the sensory deficits that occur when injuring a brachial plexus root compared to a peripheral nerve. It explains the concept of dermatomes, areas of skin supplied by sensory neurons from a single spinal cord level, and how these neurons are transmitted through various nerves. Using an analogy with Google Maps, the tutorial illustrates how understanding the brachial plexus is akin to mapping routes. It includes practice questions to reinforce learning about dermatomes, cutaneous fields, and nerve injuries, emphasizing the impact of injuries on sensation.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a dermatome?

A type of muscle in the arm

A type of bone in the spine

An area of skin supplied by sensory neurons from a single spinal cord level

A nerve that controls muscle movement

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which nerves transmit sensory neurons from the C5 dermatome to the spinal cord?

Radial and ulnar nerves

Ulnar and median nerves

Axillary and radial nerves

Musculocutaneous and median nerves

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which nerve is primarily responsible for transmitting sensory neurons from the C8 dermatome?

Axillary nerve

Median nerve

Ulnar nerve

Radial nerve

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What analogy is used to understand the sensation of the brachial plexus?

A weather map

Google Maps

A train map

A treasure map

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If the ventral ramis is injured, what happens to the dermatome?

Only part of the dermatome loses sensation

The entire dermatome loses sensation

The dermatome gains extra sensation

The dermatome remains unaffected

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a cutaneous field?

A type of bone in the arm

An area of skin supplied by sensory neurons from a single peripheral nerve

A type of muscle in the leg

A nerve that controls skin temperature

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which nerve transmits sensation from the thumb and index finger?

Axillary nerve

Ulnar nerve

Radial nerve

Median nerve

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