Dorsum of the Foot

by James Pickering, PhD

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    00:01 Now let's move on to the dorsum of the foot.

    00:06 So we can see here, the dorsum of the foot.

    00:08 So we're looking at the superior surface of the foot, the anterior aspects of the lower leg, and this is a right foot.

    00:16 We can see here, we have the inferior extensor retinaculum and this is holding in place those extrinsic muscle tendons.

    00:23 Here we can see we've got the tendons of extensor digitorum longus.

    00:27 And here we can see, we've got the long tendon of extensor hallucis longus.

    00:32 These are those extrinsic extensor muscles we spoke about.

    00:36 And they live most superficial on this dorsal surface.

    00:40 We can then start to see some intrinsic muscles here, we've got extensor digitorum brevis, we've got extensor hallucis brevis.

    00:49 And these two muscles make up the intrinsic extensor muscles.

    00:53 They reside solely within the dorsum of the foot.

    00:59 So let's have a look at these in a little bit more detail starting off with extensor digitorum brevis.

    01:04 So here we have extensive digital and brevis, which is originating from the supralateral surface of the calcaneus.

    01:12 It then gives rise to a long tendon that runs towards the tendons of extensor digitorum longus of toes II to IV.

    01:20 So this is important, it's passing it's long tendons to actually insert onto another tendon, that of the tendons of extensor digitorum longus of toes two to four.

    01:31 Here we've got extension of the 2nd-4th digits.

    01:35 Extension digitorium brevis allows extension of the 2nd-4th digits of the foot.

    01:41 Extensor hallucis brevis, you may remember, we have extensor hallucis longus.

    01:46 So here we have extensor hallucis brevis.

    01:48 This muscle originates from the supralateral surface of the calcaneus.

    01:53 And it goes and inserts on the proximal phalanx of the 1st digit, the great toe.

    01:58 This muscle is associated with extension of that 1st digit.

    02:04 The innervation of these muscles is via the deep fibular nerve.

    02:07 Remember, the deep fibular nerve is the bifurcation of the common fibular nerve, which itself came from the sciatic.

    02:16 If we then were to add in some arteries here as well, we'd see the anterior tibial artery is passing down the anterior aspect of the leg.

    02:23 It passes deep to the extensor retinaculum, where it gives rise to this blood vessel which is known as the dorsalis pedis artery.

    02:32 As the dorsalis pedis artery runs along the 1st metatarsal, we can see it gives rise to a blood vessel that moves laterally.

    02:39 This is the lateral tarsal artery.

    02:42 A second one is also given off more distally and this is the accurate artery.

    02:47 We can see it's running along the base of those metatarsals.

    02:51 This gives rise to a series of dorsal metatarsal arteries, which we see run along the metatarsals and then a series of dorsal digital arteries, which run alongside the phalanges of the foot.

    03:03 So we can see these arteries are all originating from the anterior tibial artery.

    03:09 The deep fibular nerve is running alongside the anterior tibial artery, it then continues running alongside the dorsalis pedis artery which we can see here.

    03:18 And it will give off branches that go to supply these intrinsic muscles of the foot.

    About the Lecture

    The lecture Dorsum of the Foot by James Pickering, PhD is from the course Anatomy of the Foot.

    Included Quiz Questions

    1. Extensor digitorum longus
    2. Extensor hallucis longus
    3. Extensor digitorum brevis
    4. Extensor hallucis brevis
    5. Inferior extensor retinaculum
    1. Superolateral surface of calcaneus
    2. Tendons of extensor digitorum longus of toes 1-4
    3. Inferolateral surface of calcaneus
    4. Tendons of extensor digitorum longus of toes 1-3
    5. Tendons of extensor digitorum longus of toes 1-2

    Author of lecture Dorsum of the Foot

     James Pickering, PhD

    James Pickering, PhD

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