Intrinsic Muscles of the Feet [Full Lecture]

The video tutorial provides a comprehensive overview of the muscles in the foot, organized into four layers. It begins with an introduction to the plantar fascia and its role in foot anatomy. Each layer of muscles is discussed in detail, including their origins, insertions, and functions. The tutorial also covers the innervation of these muscles, highlighting the medial and lateral plantar nerves. The video concludes with a summary of the key muscles in each layer and their respective roles in foot movement.

What is the superficial layer of muscles in the foot closest to?

• The bones

• The floor

• The toes

• The ankle

Which muscle is part of the first layer of foot muscles?

• Dorsal interossei

• Quadratus plantae

• Abductor hallucis

• Flexor hallucis longus

What is the primary function of the abductor digiti quinti?

• Extend the little toe

• Abduct the fifth digit

• Adduct the second digit

• Flex the great toe

Which tendons are found in the second layer of foot muscles?

• Flexor hallucis brevis and flexor digiti quinti

• Flexor hallucis longus and flexor digitorum longus

• Abductor hallucis and abductor digiti quinti

• Plantar interossei and dorsal interossei

What is the role of quadratus plantae in foot movement?

• Adduct the second digit

• Flex the great toe

• Extend the little toe

• Redirect the line of pull of flexor digitorum longus

Which muscle in the third layer of foot muscles has two heads?

• Quadratus plantae

• Adductor hallucis

• Flexor digiti quinti

• Flexor hallucis brevis

What is the function of the sesamoid bones in flexor hallucis brevis?

• Stabilize the ankle

• Support the arch

• Decrease mechanical advantage

• Increase mechanical advantage

Where do the plantar interossei muscles originate?

• Adjacent sides of two metatarsals

• Lateral sides of the metatarsals

• Medial sides of the 3rd, 4th, and 5th metatarsals

• On the calcaneus

Which muscles are innervated by the medial plantar nerve?

• Flexor digitorum brevis and abductor hallucis

• Flexor hallucis longus and flexor digitorum longus

• All interossei muscles

• Quadratus plantae and lumbricals 2-4

What is the primary action of the dorsal interossei muscles?

• Adduct the toes

• Extend the little toe

• Flex the great toe

• Abduct the toes