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Anterior Leg OINA
Anterior Leg OINAs
| Question | Answer |
|---|---|
| Tibialis Anterior Origin | Lateral condyle of tibia, upper half of lateral surface of shaft of tibia, interosseous membrane. |
| Tibialis Anterior Insertion | Tendon passes under extensor retinacula > inserts into medial cuneiform and base of 1st metatarsal. |
| Tibialis Anterior Nerve | Deep Fibular Nerve |
| 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. |
| Extensor Digitorum Longus Origin | Lateral condyle of tibia, upper ¾ of anterior surface of shaft of fibula, interosseous membrane. |
| 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 |
| Extensor Digitorum Longus Nerve | Deep Fibular Nerve |
| Extensor Digitorum Longus Action | Extension of lateral 4 toes, dorsiflexion of foot at ankle joint. |
| Extensor Hallucis Longus Origin | Middle part of anterior surface of shaft of fibula and interosseous membrane. |
| Extensor Hallucis Longus Insertion | Tendon passes under extensor retinacula and inserts into base of distal phalanx of big toe. |
| Extensor Hallucis Longus Nerve | Deep Fibular Nerve |
| Extensor Hallucis Longus Action | Extension of big toe, dorsiflexion of foot at ankle, assists in inversion of foot at subtalar and transvers tarsal joints. |
| Fibularis Tertius Origin | Lower third of anterior surface of shaft of fibula and interosseous membrane. |
| Fibularis Tertius Insertion | Tendon passes under extensor retinacula and inserts into dorsal aspect of base of shaft of 5th metatarsal. |
| Fibularis Tertius Nerve | Deep fibular nerve |
| Fibularis Tertius Action | Dorsiflexion of foot at ankle, eversion of foot at subtalar and transverse tarsal joints. |
| Fibularis Longus Origin | Lateral surface of head of fibula, and upper part of lateral surface of shaft of fibula. |
| Fibularis Longus Insertion | inserts into medial cuneiform and base of 1st metatarsal. |
| Fibularis Longus Nerve | Superficial fibular nerve |
| 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. |
| Fibularis Brevis Origin | Lower part of lateral surface of shaft of fibula. |
| Fibularis Brevis Insertion | inserts into tuberosity of base of 5th metatarsal |
| Fibularis Brevis Nerve | Superficial fibular nerve |
| 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. |