4th Layer Of Plantar Surface Muscles

Question 1

Plantar Interossei

Answer 1

O: medial sides of 3rd, 4th, 5th MT
I: medial sides of base of phalanges 3-5 and extensor expansion
A: adduct to line of second toe
N: lateral plantar (S2-3)

Question 2

Dorsal Interossei

Answer 2

O: adjacent sides of shafts of MT 1-5
I: #1 to medial side of the 2nd digit
   #2 to lateral side of 2nd digit
   #3 to lateral side of 3rd digit
   #4 to lateral side of 4th digit
A: abducts from line of 2nd toe (digits 2-4)  and flex MTP
N: lateral plantar (S2-3)