W29-L6: Foot Flashcards
Where does the extensor digitorum brevis arise from?
superiolateral side of calcaneus and joins longus tendon
Which tendons contribute to the extensor hood?
All of them
What branches does the dorsalis pedis artery give?
Lateral arcuate artery, metatarsal and digital arteries and then deep palamar artery which completes deep palmar arch
What is the plantar aponeurosis?
thickening of fascia in the sole of the foot, back of calcenues (inferior surface) extends forward over sole expands into 5 slits which inserts in the bones, ligaments and skin of the toes
What is the first layer of the sole of the foot?
layer of intrinsic short muscles, extend for the whole length of the foot (origin from heel to toes), abductors and a flexor capable in maintaining the arches of the foot
What is layer two of the sole of the foot?
long tendons (are tib. post, FHL, FDL) from tarsal tunnel as well as tib ant. and fib longus
What is flexor accessorius?
an accessory flexor, two heads from the calceneus inserts into posteriolateral border of FDL
What is layer three of the sole of the foot?
deep layer of shorter intrinsic muscles more proximal attachment, flexor for little and big toe, adductor hallicus
What is layer four of the sole of the foot?
interossei are between the bones in the inter-metatarsal spaces, adduction and abduction are around the axis of the 2nd digit
Where do the neurovascular structures in the sole of the foot run?
between layer 1 and 2 first layer of intrinsic muscles and long tendons
What does posterior tibial artery divide into?
medial and lateral palmar artery (lateral creates deep plantar artery)
What does the tibial nerve split into?
lateral and medial plantar nerve, lateral supplies lateral 1.5 toe (little and half 4th) like ulnar in the arm and nearly all of intrinsic muscles of the sole of the foot, medial plantar nerve does very little intrinsic muscles but medial 3.5 digits (the rest)
