10.3 Intrinsic Foot

Question 1

What are the two attachments of the plantar aponeurosis?

Answer 1

• Calcaneus
• Proximal phalanges

Question 2

Describe the extensor hood of the dorsal foot. What is the overall function?

Answer 2

• Tendons of extensor digitorum longus flattens into aponeurosis that surrounds digits
• Allows extension at IP joints

Question 3

True or false: like flexor hallucis longus, extensor hallucis brevis starts laterally, on the superiolateral calcaneus. How does this influence extensor digitorum brevis origin?

Answer 3

• True; inserts on superiolateral calcaneus
• Therefore, extensor digitorum brevis inserts on superioanterior calcaneus

Question 4

What is the common origin of the Abercrombie and Fitch muscles? What are they?

Answer 4

• Originate on calcaneus (long sleeve T shirt)
• ABductors: hallucis and digiti minimi
• Flexors: digitorum brevis

Question 5

Recall the plant centre muscles

Answer 5

• Quadratus PLANTae
• Lumbrials (worms)

Question 6

Recall the 7/11 muscles (in construction, of course)

Answer 6

• Adductor hallucis (remember the foot midline)
• Flexor hallucis brevis
• Flexor digiti minimi brevis

Question 7

Recall the inter office space muscles

Answer 7

• Interosseus muscles

Question 8

Which metatarsals are involved in which arches of the foot (medial vs lateral)?

Answer 8

First to third ray: medial arch (three-dial arch)
Fourth and fifth rays: lateral rays