Question:medium
All of the following are contents of the midpalmar space EXCEPT:
All of the following are contents of the midpalmar space EXCEPT:
Show Hint
Which lumbrical belongs to the thenar space rather than the midpalmar space?
Updated On: Jun 24, 2026
- 2nd lumbrical
- Flexor digitorum profundus (FDP) tendon of the 3rd finger
- 1st lumbrical
- Flexor digitorum profundus (FDP) tendon of the 4th finger
Show Solution
The Correct Option is C
Solution and Explanation
Step 1: Identify which fascial compartment of the palm each listed structure occupies.
Step 2: The intermediate palmar septum splits the deep palm into a lateral thenar space and a medial midpalmar space. The midpalmar space houses the deeper tendons and lumbricals of the middle, ring and little fingers.
Step 3: Working through the options, the FDP tendons of the 3rd and 4th fingers and the 2nd lumbrical all sit within the midpalmar space, so they are genuine contents.
Step 4: The 1st lumbrical accompanies the index finger flexor and lies in the thenar space, placing it outside the midpalmar space. That makes it the odd one out.
\[\boxed{\text{1st lumbrical}}\]
Step 2: The intermediate palmar septum splits the deep palm into a lateral thenar space and a medial midpalmar space. The midpalmar space houses the deeper tendons and lumbricals of the middle, ring and little fingers.
Step 3: Working through the options, the FDP tendons of the 3rd and 4th fingers and the 2nd lumbrical all sit within the midpalmar space, so they are genuine contents.
Step 4: The 1st lumbrical accompanies the index finger flexor and lies in the thenar space, placing it outside the midpalmar space. That makes it the odd one out.
\[\boxed{\text{1st lumbrical}}\]
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