00:01 Now let's go step by step through each of these layers. 00:05 So layer 1. 00:07 So here we can see a number of those muscles we mentioned previously. 00:10 These form the first layer on the sole of the foot, we have abductor digiti minimi, we have flexor digitorum brevis, and we have abductor hallucis. 00:22 Let's look at abductor digiti minimi. 00:25 It originates from the calcaneus and the plantar aponeurosis, on this medial aspect and then it passes towards the base of the proximal phalanx, of the fifth digit. 00:36 Is involved in abducting the little toe, or the fifth digit. 00:42 Here's flexor digitorum brevis. 00:44 Flexor digitorum brevis originates from the calcaneal tuberosity, also the plantar aponeurosis. 00:52 It then extends distally towards the sides on the plantar surface of the middle phalanges of the lateral four toes. 01:01 So they extend to the sides of the plantar surfaces of the middle phalanges of those lateral four toes. 01:08 So digits 2-5, not on the great toe. 01:12 This muscle flexor digitorum brevis is associated flexion of the lateral four toes. 01:19 So two toes 2-5. 01:21 Remember it missed out the great toe. 01:25 Now let's talk about abductor hallucis. 01:28 Abductor hallucis originates on this medial aspect. 01:32 It's coming from the calcaneal tuberosity and also the plantar aponeurosis and it extends distally towards the great toe, the proximal phalanx of the first digit. 01:44 This muscle abductor hallucis is associated with both flexion of the great toe and abduction of the great toe as well. 01:52 So two functions there of abductor hallucis. 01:57 The nerve supply to the first layer is via the lateral plantar nerve, which supplies abductor digiti minimi. 02:05 And then the medial plantar nerve, which is supplying both abductor hallucis and flexor digitorum brevis.
The lecture Plantar Muscles of the Foot: Layer 1 by James Pickering, PhD is from the course Anatomy of the Foot.
What is the function of the abductor digiti minimi?
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