Plantar Muscles of the Foot: Layer 1

by James Pickering, PhD

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    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.

    About the Lecture

    The lecture Plantar Muscles of the Foot: Layer 1 by James Pickering, PhD is from the course Anatomy of the Foot.

    Included Quiz Questions

    1. Abduction of little toe
    2. Abduction of all five toes
    3. Abduction of two smallest toes
    4. Adduction of little toe
    5. Adduction of two smallest toes

    Author of lecture Plantar Muscles of the Foot: Layer 1

     James Pickering, PhD

    James Pickering, PhD

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