Intrinsic Muscles of the Feet [Part 2] Layers 3 & 4

The video tutorial provides an in-depth look at the muscles of the foot, focusing on the flexor hallucis brevis, flexor digiti quinti, and adductor hallucis. It explains the structure, origin, insertion, and function of these muscles, as well as their innervation by the medial and lateral plantar nerves. The tutorial also covers the interosseous muscles, detailing their role in foot movement and their anatomical positioning.

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

• Flexor digitorum brevis

• Adductor hallucis

• Flexor hallucis brevis

• Flexor digiti quinti

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

• To protect the tendon

• To increase mechanical advantage

• To provide structural support

• To aid in extension

Where does the flexor digiti quinti originate?

• Base of the 1st metatarsal

• Lateral cuneiform

• Base of the 5th metatarsal

• Cuboid bone

What is the function of the adductor hallucis muscle?

• Adduction of the big toe

• Flexion of the big toe

• Abduction of the big toe

• Extension of the little toe

Which muscles are responsible for adduction in the foot?

• Flexor hallucis longus

• Plantar interossei

• Dorsal interossei

• Flexor digitorum brevis

What is the midline of the foot defined by?

• 3rd digit

• 4th digit

• 1st digit

• 2nd digit

Which layer contains the abductor hallucis muscle?

• Layer one

• Layer two

• Layer three

• Layer four

Which nerve innervates the flexor hallucis brevis?

• Medial plantar nerve

• Tibial nerve

• Lateral plantar nerve

• Sural nerve

How many muscles are innervated by the medial plantar nerve?

• Five

• Two

• Three

• Four

Which lumbrical is innervated by the medial plantar nerve?

• Third lumbrical

• Medial lumbrical

• Fourth lumbrical

• Lateral lumbrical