Describe the structure of the extensor hood
The head inserts into the distal phalanx
The sides of each inserts into middle phalanx
The base wraps about the metatarsophalangeal joint
What does the deep plantar artery do on the dorsum of the foot?
Dives between the 1st and 2nd metatarsal and joins the lateral plantar artery
What is the origin and insertion of extensor digitorum brevis?
O: Superiolateral calcaneus
I: The tendon of EDL
Around which toe does adduction and abduction occur in the foot?
Which muscles are contained within layer 2 of the sole of the foot?
The lumbricles - off the tendon of FDL
What is contained in layer 3 of the sole of the foot?
A short flexor for the little and big toe
Which nerve supplies the sole of the foot?
The tibial nerve - splits into the lateral and medial plantar nerve
What are the major structures that support the arches of the foot?
Long plantar ligament
Fibularis longus tendon
How are the extensor retinaculum arranged?
There is a superior band that spans the distal fibula and tibia
An inferior Y shaped band spanning the medial malleolus and medial aspect of the plantar aponeurosis to the superiolateral calcaneus
What is the origin of the plantar aponeurosis?
The medial calcaneal tuberosity
What is contained in layer 4 of the sole of the foot?
Tendon of fibularis longus and tibialis posterior
How do the medial and lateral plantar nerves supply the sole of the foot?
The lateral supplies the 5th toe and half the 4th while the
medial supplies 3 and a half toes
What is the function of flexor accessorius?
Straightens the line of pull of FDL
What is contained in layers 1 of the sole of the foot?
- One adductor from the little toe - adductor digiti minimi
- One adductor for the great toe - adductor hallucis
- Flexor digitorum brevis
What are the structures on the dorsum of the foot?
Extensor digitorum brevis
Deep fibular nerve
Dorsalis pedis artery
How are the lateral/flexor retinaculum arranged?
One superior band spanning the lateral calcaneus to the lateral malleolus
One inferior band that spans the lateral calcaneus to the be continuous with the inferior extensor retinaculum
What do the septa of the plantar aponeurosis do?
Divide the sole into three compartments
Which tendons are contained in layer 2 of the sole of the foot?
From medial aspect
- Tibialis posterior
- Flexor hallucis longus
- Flexor digitorum longus
From lateral aspect
- Fibularis longus
Which artery supplies the sole of the foot?
The posterior tibial artery - splits into medial and lateral plantar arteries
What is the dorsalis pedis artery a continuation of?
The anterior tibial artery
What are the arches of the foot?
One medial and one lateral longitudinal arch
One transverse arch
What is the name of the structure rooved by the medial flexor retinaculum?
The tarsal tunnel
Which tendon lies deeper on the sole of the foot, FDL or FHL?