Lab 7 - Module 4 - The Foot: Page 5 of 8
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Second layer of the sole of the foot:
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| Add the Lumbricles (1st one) muscle. |
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Origin - Medial side of the first tendon (to the 2nd toe) of FDL Insertion - Passes along the medial side of the 2nd toe and inserts on its dorsal digital expansion Innervation - Medial plantar nerve (S2,S3) Action - Flexes the proximal phalanx of the 2nd toe at the MTP joint. Extends the other two joints of the 2nd toe |
| Add the 2-4 Lumbricals muscles. |
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Origin - By heads from the adjacent FDL tendons 3, 4, 5 Insertion - Medial sides of the 3, 4, 5 toes to their respective dorsal digital expansions Innervation - All three by the lateral plantar nerve (S2,S3) Action - Same as the first except with respect to their own toe |
| Add the Quadratus Plantae muscle. |
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Origin - Plantar surface of the calcaneous, long plantar ligament Insertion - Lateral and deep surfaces of the tendons of the flexor digitorum longus muscle Innervation - Lateral Plantar Nerve (S2,S3) Action - Assists the flexor digitorum longus by straightening the pull of FDL along the longitudinal axis of the foot |
| Add the Tendon of Flexor Digitorum Longus . |
| Add the Tendon of the Flexor Hallicus Longus . |