Dermatomes

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.

What sensory deficits occur when you injure a root of the brachial plexus?

What is a dermatome and how is it related to sensory neurons?

Describe the role of the C5 dermatome in sensory transmission.

How does the analogy of Google Maps help in understanding the brachial plexus?

What happens to sensation in the C6 dermatome if the ventral ramis is injured?

Explain the difference between a dermatome and a cutaneous field.

How do sensory neurons from the median nerve relate to the C6 and C7 dermatomes?

What are the major cutaneous fields associated with the brachial plexus?

Discuss the implications of injuring a peripheral nerve versus a ventral ramis.

What would be the effect on sensation if the ulnar nerve is injured?