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Dorsal Intrinsic Foot Muscles Quiz

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Questions and Answers

Which nerve innervates the extensor digitorum brevis?

Tibial

Sural

Deep fibular (correct)

Superficial fibular

What is the function of the extensor hallucis brevis?

Dorsiflexion of the ankle

Abduction of the first toe

Extension of the MTP joint of the first toe (correct)

Flexion of the first toe at the MTP joint

Which joints are extended by the extensor digitorum brevis?

All joints of toes 1-4

Only the PIP joints of toes 2-4

MTP, PIP, and DIP joints of toes 2-4 (correct)

Only the MTP joints of toes 1-4

What are the roots of the deep fibular nerve that innervates the dorsal intrinsic foot muscles?

L5-S1 Signup and view all the answers

Which of the following actions is NOT performed by the extensor digitorum brevis?

Extension of the PIP joints of toes 1-4 Signup and view all the answers

What is the main nerve responsible for innervating the dorsal intrinsic foot muscles?

Deep fibular nerve Signup and view all the answers

Which toes are extended by the extensor digitorum brevis?

Toes 2-4 Signup and view all the answers

What action does the extensor hallucis brevis perform?

Extension of the MTP joint of the big toe Signup and view all the answers

Which root level corresponds to the nerve supply of the extensor digitorum brevis?

L5-S1 Signup and view all the answers

Which of the following statements is true regarding the dorsal intrinsic foot muscles?

They are comprised of extensor digitorum brevis and extensor hallucis brevis. Signup and view all the answers

Study Notes

Dorsal Intrinsic Foot Muscles

Comprised of two key muscles: extensor digitorum brevis and extensor hallucis brevis.
Innervated primarily by the deep fibular nerve.

Extensor Digitorum Brevis

Nerve supply: deep fibular nerve.
Root level: L5-S1.
Responsible for extension of the metatarsophalangeal (MTP), proximal interphalangeal (PIP), and distal interphalangeal (DIP) joints of toes 2-4.

Extensor Hallucis Brevis

Nerve supply: deep fibular nerve.
Root level: L5-S1.
Function: extension of the MTP joint of the big toe (1st toe).

Dorsal Intrinsic Foot Muscles

Comprise two main muscles: extensor digitorum brevis and extensor hallucis brevis.
Primarily innervated by the deep fibular nerve.

Extensor Digitorum Brevis

Innervated by the deep fibular nerve.
Root level: L5-S1.
Function involves extension of:
- Metatarsophalangeal (MTP) joints of toes 2-4.
- Proximal interphalangeal (PIP) joints of toes 2-4.
- Distal interphalangeal (DIP) joints of toes 2-4.

Extensor Hallucis Brevis

Innervated by the deep fibular nerve.
Root level: L5-S1.
Function focused on the extension of the MTP joint of the big toe (1st toe).

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Description

Test your knowledge on the dorsal intrinsic foot muscles, including the extensor digitorum brevis and extensor hallucis brevis. This quiz covers their anatomy, nerve supply, and functions. Perfect for students of anatomy and physiology!