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
Fourth Dorsal Interosseous Muscle of Foot
Muscular System

Fourth Dorsal Interosseous Muscle of Foot

Musculus interosseus dorsalis pedis quartus

Read more

Quick Facts

Origin: Lateral aspect of body of fourth metatarsal bone and medial aspect of body of fourth metatarsal bone.

Insertion: Lateral aspect of base of proximal phalanx of fourth toe and extensor expansion of fourth toe.

Action: Abducts fourth toe at its metatarsophalangeal joint; simultaneously flexes metatarsophalangeal joint and extends interphalangeal joints of fourth toe.

Innervation: Superficial branch of lateral plantar nerve (S2-S3).

Arterial Supply: Arcuate, dorsal and plantar metatarsal, and dorsal digital arteries of foot.

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

Origin

The fourth dorsal interosseous muscle of foot consists of two heads:

- the medial head, which originates from the lateral aspect of the body of fourth metatarsal bone;

- the lateral head, which originates from the medial aspect of the body of fifth metatarsal bone.

Insertion

The fibers of the fourth dorsal interosseous muscle of foot travel anteriorly to the fourth toe and insert, via a short tendon, onto the:

- lateral aspect of the base of the proximal phalanx of fourth toe;

- extensor expansion of fourth toe.

Key Features & Anatomical Relations

The fourth dorsal interosseous muscle of foot is located in the fourth layer of muscles that are found in the plantar part of the foot. It is a short, bipennate skeletal muscle.

It is located:

- superior to the fourth lumbrical muscle of foot, and the second plantar interosseous muscle of foot;

- medial to the fifth metatarsal bone;

- lateral to the fourth metatarsal bone.

One of the perforating branches of deep plantar arch travels in between the two heads of the fourth dorsal interosseous muscle of foot.

Actions

The fourth dorsal interosseous muscle of foot is involved in multiple actions:

- abducts the proximal phalanx of fourth toe (i.e., draws it away from the longitudinal axial line of the second toe) at the fourth metatarsophalangeal joint;

- simultaneously flexes the fourth metatarsophalangeal joint and extends the interphalangeal joints of the fourth toe, which occurs when the third lumbrical and second plantar interosseous muscles of foot contract simultaneously with it (Standring, 2016).

List of Clinical Correlates

- Clawing of the toes

- Charcot-Marie-Tooth disease

References

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

Actions

The fourth dorsal interosseous muscle of foot is involved in multiple actions:

- abducts the proximal phalanx of fourth toe (i.e., draws it away from the longitudinal axial line of the second toe) at the fourth metatarsophalangeal joint;

- simultaneously flexes the fourth metatarsophalangeal joint and extends the interphalangeal joints of the fourth toe, which occurs when the third lumbrical and second plantar interosseous muscles of foot contract simultaneously with it (Standring, 2016).

Learn more about this topic from other Elsevier products

Foot Muscle

ScienceDirect image

In fact, atrophy of foot muscles is even observed in patients without clinical signs of DSPN, underlining the presence of motor changes in DSPN well in advance of clinical findings and complaints [85].

Explore on ScienceDirect(opens in new tab/window)

Complete Anatomy

The world's most advanced 3D anatomy platform

Complete Anatomy