Question:
All of the following are contents of the midpalmar space EXCEPT:
All of the following are contents of the midpalmar space EXCEPT:
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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
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The Correct Option is C
Solution and Explanation
Step 1: The palm has two potential fascial spaces deep to the long flexor tendons: the thenar (lateral) space and the midpalmar (medial) space, separated by the intermediate palmar septum.
Step 2: The midpalmar space lies medially. Its anterior boundary is formed by the flexor tendons of the 3rd, 4th and 5th fingers along with the 2nd, 3rd and 4th lumbricals and the palmar aponeurosis, while its posterior wall is the fascia over the interossei and metacarpals.
Step 3: Therefore the 2nd lumbrical and the FDP tendons of the 3rd and 4th fingers are all contents of the midpalmar space.
Step 4: The 1st lumbrical, however, lies in the thenar space, not the midpalmar space. Hence the 1st lumbrical is the exception and is the correct answer.
Step 2: The midpalmar space lies medially. Its anterior boundary is formed by the flexor tendons of the 3rd, 4th and 5th fingers along with the 2nd, 3rd and 4th lumbricals and the palmar aponeurosis, while its posterior wall is the fascia over the interossei and metacarpals.
Step 3: Therefore the 2nd lumbrical and the FDP tendons of the 3rd and 4th fingers are all contents of the midpalmar space.
Step 4: The 1st lumbrical, however, lies in the thenar space, not the midpalmar space. Hence the 1st lumbrical is the exception and is the correct answer.
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