Dorsal muscles of the foot (3D)

This video tutorial explores the anatomy and functions of two small dorsal muscles in the foot: the extensor hallucis brevis and the extensor digitorum brevis. It covers their origins, insertions, and the joints they act upon, as well as their innervation by the deep fibular nerve. The tutorial explains how these muscles assist in the extension of the big toe and the 2nd to 4th digits, supporting larger muscles in these movements. The video concludes with a recap of the key functions of these muscles.

Which two muscles are the focus of this tutorial?

• Extensor hallucis brevis and extensor digitorum brevis

• Flexor digitorum longus and flexor hallucis longus

• Gastrocnemius and soleus

• Tibialis anterior and peroneus longus

Where does the extensor hallucis brevis muscle originate?

• Medial surface of the tibia

• Superolateral surface of the calcaneus

• Inferior surface of the talus

• Lateral surface of the fibula

What is a unique feature of the extensor digitorum brevis muscle?

• It can have variable anatomy with additional heads

• It originates from the medial cuneiform

• It has a fixed number of heads

• It only acts on the big toe

Which nerve innervates both the extensor hallucis brevis and extensor digitorum brevis muscles?

• Superficial fibular nerve

• Deep fibular nerve

• Tibial nerve

• Sural nerve

What is the primary function of the extensor hallucis brevis muscle?

• Abduction of the big toe

• Extension of the big toe at the metatarsophalangeal joint

• Flexion of the big toe

• Adduction of the big toe

Which joints are affected by the extensor digitorum brevis muscle?

• Knee joint

• Metatarsophalangeal and proximal interphalangeal joints of the 2nd to 4th digits

• Only the metatarsophalangeal joint of the big toe

• Ankle joint

What is the role of the extensor digitorum brevis in toe movement?

• It flexes the toes

• It assists in the extension of the 2nd to 4th toes

• It adducts the toes

• It abducts the toes