Question:medium
The marked area in the given image is supplied by which dermatome?
The marked area in the given image is supplied by which dermatome?
Show Hint
The umbilicus is the landmark for the T10 dermatome.
Updated On: Jun 23, 2026
- T8
- T9
- T10
- T11
Show Solution
The Correct Option is C
Solution and Explanation
Step 1: Anchor on the key sensory point. The umbilicus is the classic exam landmark for one specific thoracic dermatome.
Step 2: Apply the rule. At the midclavicular line, the horizontal level of the umbilicus maps to T10.
Step 3: Build the surrounding ladder. T7 is one quarter, T8 is one half, and T9 is three quarters of the way from the xiphoid to the umbilicus, after which T10 sits exactly at the umbilicus.
Step 4: Confirm the answer. Since the marked region is the umbilical level, it cannot be T8, T9, or T11, leaving T10.
$umbilicus \rightarrow T10\ dermatome$
\[\boxed{T10}\]
Step 2: Apply the rule. At the midclavicular line, the horizontal level of the umbilicus maps to T10.
Step 3: Build the surrounding ladder. T7 is one quarter, T8 is one half, and T9 is three quarters of the way from the xiphoid to the umbilicus, after which T10 sits exactly at the umbilicus.
Step 4: Confirm the answer. Since the marked region is the umbilical level, it cannot be T8, T9, or T11, leaving T10.
$umbilicus \rightarrow T10\ dermatome$
\[\boxed{T10}\]
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