Anterior Leg OINAs
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each of the black spaces below before clicking
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| Tibialis Anterior Origin | Lateral condyle of tibia, upper half of lateral surface of shaft of tibia, interosseous membrane.
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| Tibialis Anterior Insertion | Tendon passes under extensor retinacula > inserts into medial cuneiform and base of 1st metatarsal.
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| Tibialis Anterior Nerve | Deep Fibular Nerve
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| Tibialis Anterior Action | Dorsiflexion of foot at ankle joint, inversion of foot at subtalar and transverse tarsal joints, assists in holding up medial longitudinal arch of foot.
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| Extensor Digitorum Longus Origin | Lateral condyle of tibia, upper ¾ of anterior surface of shaft of fibula, interosseous membrane.
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| Extensor Digitorum Longus Insertion | Muscle belly gives rise to 4 tendons which pass under extensor retinacula. each tendon divides into 3 slips > central slip inserts into base of middle phalanx > 2 lateral slips join and insert into base of distal phalanx
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| Extensor Digitorum Longus Nerve | Deep Fibular Nerve
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| Extensor Digitorum Longus Action | Extension of lateral 4 toes, dorsiflexion of foot at ankle joint.
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| Extensor Hallucis Longus Origin | Middle part of anterior surface of shaft of fibula and interosseous membrane.
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| Extensor Hallucis Longus Insertion | Tendon passes under extensor retinacula and inserts into base of distal phalanx of big toe.
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| Extensor Hallucis Longus Nerve | Deep Fibular Nerve
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| Extensor Hallucis Longus Action | Extension of big toe, dorsiflexion of foot at ankle, assists in inversion of foot at subtalar and transvers tarsal joints.
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| Fibularis Tertius Origin | Lower third of anterior surface of shaft of fibula and interosseous membrane.
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| Fibularis Tertius Insertion | Tendon passes under extensor retinacula and inserts into dorsal aspect of base of shaft of 5th metatarsal.
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| Fibularis Tertius Nerve | Deep fibular nerve
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| Fibularis Tertius Action | Dorsiflexion of foot at ankle, eversion of foot at subtalar and transverse tarsal joints.
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| Fibularis Longus Origin | Lateral surface of head of fibula, and upper part of lateral surface of shaft of fibula.
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| Fibularis Longus Insertion | inserts into medial cuneiform and base of 1st metatarsal.
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| Fibularis Longus Nerve | Superficial fibular nerve
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| Fibularis Longus Action | Plantar flexion of foot at ankle joint, eversion of foot at subtalar and transvers tarsal joints, helps to maintain lateral longitudinal and transverse arches of foot.
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| Fibularis Brevis Origin | Lower part of lateral surface of shaft of fibula.
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| Fibularis Brevis Insertion | inserts into tuberosity of base of 5th metatarsal
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| Fibularis Brevis Nerve | Superficial fibular nerve
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| Fibularis Brevis Action | Plantar flexion of foot at ankle, eversion of foot at subtalar and transverse tarsal joints, assists in holding up lateral longitudinal arch of foot.
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Created by:
MichaelR
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