Podcast
Questions and Answers
Which nerve innervates the extensor digitorum brevis?
Which nerve innervates the extensor digitorum brevis?
- Tibial
- Sural
- Deep fibular (correct)
- Superficial fibular
What is the function of the extensor hallucis brevis?
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?
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?
What are the roots of the deep fibular nerve that innervates the dorsal intrinsic foot muscles?
Which of the following actions is NOT performed by the extensor digitorum brevis?
Which of the following actions is NOT performed by the extensor digitorum brevis?
What is the main nerve responsible for innervating the dorsal intrinsic foot muscles?
What is the main nerve responsible for innervating the dorsal intrinsic foot muscles?
Which toes are extended by the extensor digitorum brevis?
Which toes are extended by the extensor digitorum brevis?
What action does the extensor hallucis brevis perform?
What action does the extensor hallucis brevis perform?
Which root level corresponds to the nerve supply of the extensor digitorum brevis?
Which root level corresponds to the nerve supply of the extensor digitorum brevis?
Which of the following statements is true regarding the dorsal intrinsic foot muscles?
Which of the following statements is true regarding the dorsal intrinsic foot muscles?
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!
