Dorsal ulnar sensory innervation in the hand includes which of the following?

Dorsal ulnar sensory innervation in the hand includes which of the following?

• A. Digit V and half of digit IV
• B. Digits I-V
• C. Digits II-III and half of digit IV
• D. Digits I-III and half of digit IV

Answer: (A)

The correct choice is based on anatomical knowledge of the nerve pathways and their areas of innervation. The dorsal ulnar sensory innervation is primarily provided by the ulnar nerve, specifically its dorsal branch. This branch supplies sensation to the skin on the dorsal aspect of the hand, particularly to the fifth digit (little finger) and the medial half of the fourth digit (ring finger). This distribution is crucial for understanding the sensory innervation patterns of the hand. The ulnar nerve is responsible for the sensory supply to the regions mentioned and is essential for determining the areas affected in conditions such as nerve injuries or entrapments. The other choices include digits that are not supplied by the dorsal ulnar sensory branch. For instance, the first three digits (thumb and index/middle fingers) are primarily innervated by the median nerve, while the remaining portions of the fourth digit and the entirety of the fifth digit fall under the ulnar nerve’s control. Therefore, the correct answer reflects the specific and established sensory zones of the ulnar nerve.

The correct choice is based on anatomical knowledge of the nerve pathways and their areas of innervation. The dorsal ulnar sensory innervation is primarily provided by the ulnar nerve, specifically its dorsal branch. This branch supplies sensation to the skin on the dorsal aspect of the hand, particularly to the fifth digit (little finger) and the medial half of the fourth digit (ring finger).

This distribution is crucial for understanding the sensory innervation patterns of the hand. The ulnar nerve is responsible for the sensory supply to the regions mentioned and is essential for determining the areas affected in conditions such as nerve injuries or entrapments.

The other choices include digits that are not supplied by the dorsal ulnar sensory branch. For instance, the first three digits (thumb and index/middle fingers) are primarily innervated by the median nerve, while the remaining portions of the fourth digit and the entirety of the fifth digit fall under the ulnar nerve’s control. Therefore, the correct answer reflects the specific and established sensory zones of the ulnar nerve.