Skip to main content

Unfortunately we don't fully support your browser. If you have the option to, please upgrade to a newer version or use Mozilla Firefox, Microsoft Edge, Google Chrome, or Safari 14 or newer. If you are unable to, and need support, please send us your feedback.

Elsevier
Publish with us
Second Dorsal Interosseous Muscle of Hand
Muscular System

Second Dorsal Interosseous Muscle of Hand

Musculus interosseus dorsalis manus secundus

Read more

Quick Facts

Origin: Medial aspect of body of second metacarpal bone and lateral aspect of body of third metacarpal bone.

Insertion: Lateral aspect of base of proximal phalanx and extensor expansion of middle finger.

Action: Laterally abducts middle finger at its metacarpophalangeal joint; simultaneously flexes metacarpophalangeal joint and extends interphalangeal joints of middle finger.

Innervation: Deep branch of ulnar nerve (C8-T1).

Arterial Supply: Deep palmar arch, perforating branches of deep palmar arch, dorsal and palmar metacarpal arteries.

Complete Anatomy
The world's most advanced 3D anatomy platform
Try it for Free

Origin

The second dorsal interosseous muscle of hand consists of two heads:

- the lateral head, which originates from the medial aspect of the body of second metacarpal bone;

- the medial head, which originates from the lateral aspect of the body of third metacarpal bone.

Insertion

The fibers of the second dorsal interosseous muscle of hand travel inferiorly to the middle finger and insert, via a short tendon, onto the:

- lateral aspect of the base of the proximal phalanx of middle finger;

- extensor expansion of middle finger.

Key Features & Anatomical Relations

The second dorsal interosseous muscle of hand is found in the interosseous compartment of the hand. It is a short, bipennate skeletal muscle. It is located:

- posterior to the first palmar interosseous and second lumbrical muscles of hand;

- medial to the second metacarpal bone;

- lateral to the third metacarpal bone.

One of the perforating branches of deep palmar arch travels between the two heads of the second dorsal interosseous muscle of hand.

Actions & Testing

The second dorsal interosseous muscle of hand is involved in multiple actions:

- laterally abducts the proximal phalanx of middle finger (i.e., laterally draws it away from the longitudinal axial line of the middle finger) at the third metacarpophalangeal joint;

- simultaneously flexes the third metacarpophalangeal joint and extends the interphalangeal joints of the middle finger, which occurs when the second lumbrical and third dorsal interosseous muscles of hand contract simultaneously with it.

Because the second and third dorsal interossei muscles insert on opposite sides of the proximal phalanx of the middle finger, their simultaneous contraction will cancel each other’s movements, resulting in the middle finger remaining in the anatomical position.

The second dorsal interosseous muscle of hand can be tested by laterally abducting the proximal phalanx of middle finger at the second metacarpophalangeal joint against resistance (Standring, 2016).

References

Standring, S. (2016) Gray's Anatomy: The Anatomical Basis of Clinical Practice. Gray's Anatomy Series 41st edn.: Elsevier Limited.

Learn more about this topic from other Elsevier products

Hand Muscle

ScienceDirect image

When hand muscles contract shortly after individuals engage in a repetitive action that forms the basis of their livelihood, neurologists term the disorder occupational dystonia or task-specific dystonia.

Explore on ScienceDirect(opens in new tab/window)

Complete Anatomy

The world's most advanced 3D anatomy platform

Complete Anatomy