First Dorsal Interosseous

Last updated on Monday, April 27 2009 by blondarb

Muscle Name: first dorsal interosseous

AKA:

Abbreviation: FDI

Spinal Nerve Roots:
C8
T1

Brachial Plexus Trunks:
lower trunk

Brachial Plexus Cords:
medial cord

Named Nerves:
ulnar nerve

Proximal Attachment: metacarpal bone.

Distal Attachment: proximal phalanx on the first digit.

Action: Abduct the first digit.

Needle Insertion: With the hand in the midpoint between supination and pronation, the needline is inserted at the midpoint between the first and second metacarpal bone.

Activation for EMG: Abduct the finger. ("Point to the ceiling")

Pitfalls:

Notes: One of the least painful hand muscles to study.

Related videos:

First Dorsal Interosseous EMG Technique
A demonstration of the needle placement and activation technique in an EMG study of the first dorsal interosseous (FDI) muscle.

Related images:

First Dorsal Interosseous Needle Placement
A demonstration of the needle placement for an EMG of the first dorsal interosseous muscle.

First Dorsal Interosseous in Action
The first dorsal interosseous muscle abducts the 2nd finger.

First Dorsal Interosseous Surface View
This image shows the surface anatomy relevant to the first dorsal interosseous muscle.

First Dorsal Interosseous
This image shows the first dorsal interosseous.

First Dorsal Interosseous
This image shows a view of the First Dorsal Interosseous muscle.

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