10.3 Anterior and Lateral Compartment of Leg and Dorsum of Foot Flashcards
Identify the crural fascia
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Identify the great saphenous vein
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Identify the lateral sural cutaneous nerve
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Identify the sural nerve
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Identify the superficial fibular nerve
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Identify the muscles of the anterior leg: Tibialis anterior Extensor hallucis longus Extensor digitorum longus Fibularis tertius What are these innervated by? What are their main function?
Fxn: mainly dorsiflexion of ankle and extension of toes
Innervation; Deep fibular nerve L5-S2
Specific functions of anterior leg muscles
iii. Tibialis anterior
1. Attachments: Proximally, lateral condyle, superolateral tibia, and interosseus membrane; Distally, medial cuneiform and base of MT 1
2. Actions: dorsiflex ankle, invert foot, support medial longitudinal arch of foot
iv. Extensor digitorum longus
1. Attachments: Proximally, lateral condyle of tibia and superoanterior interosseus membrane, distally, middle and distal phalanges of lateral 4 digits
2. Actions: extends lateral 4 digits; dorsiflexes ankle
v. Extensor hallucis longus
1. Attachments: Proximally, middle part of anterior fibula and interosseus membrane; distally, dorsal base of great toe’s distal hallux
2. Actions: extends great toe, dorsiflexes ankle
vi. Fibularis tertius
1. Attachments: Proximally, inferoanterior fibula and interosseus membrane; distally, dorsal base of 5th MT
2. Actions: dorsiflexes ankle, aids foot eversion
Identify the anterior tibial artery
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Identify the deep fibular nerve
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Identify the superficial fibular nerve
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Identify the extensor retinaculum
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Identify the rascals pedis artery
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Identify the deep fibular nerve
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Identify the lateral tarsal artery, arcuate artery, dorsal metatarsal artery, and deep plantar artery
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Identify the extensor digitorum brevis
originates from the dorsal surface of the calcaneus and inserts onto the dorsal aponeuroses at the base of the middle phalanges of the 2nd to 4th toes.
Innervation: Deep fibular nerve (L5, S1).
acts to extend the 2nd to 4th toes at the metatarsophalangeal (MPT) joint and the proximal interphalangeal (PIP) joint.
Identify the extensor hallucis brevis
originates from the dorsal surface of the calcaneus and inserts into the dorsal aponeurosis and proximal phalanx of the 1st toe.
Innervation: Deep fibular nerve (L5, S1).
acts to extend the 1st toe at the metatarsophalangeal joint.
Identify the dorsal interossei mm
- Attachments: Proximally, sides of MT 1-5; distally, first – medial side of proximal phalanx of 2nd digit, 2-4 – lateral sides of digits 2-4
- Actions: abduct digits 2-4 and flex metatarsophalangeal joints
- Innervation: lateral plantar n. (S2-S3)
Identify the muscles of the lateral compartment of the leg.
What are they innervated by?
What is their general function?
Fibularis longus
Fibularis Brevis
Innervated by Superficial fibular nerve (L4-S1)
Actions: mainly evert foot
Fibularis longus
- Attachments: Proximally, head and superolateral fibula; distally, base of 1st MT and medial cuneiform
- Actions: evert foot, weakly plantarflexes ankle, supports transverse arch of foot
Fibularis brevis
- Attachments: inferior 2/3rds of lateral fibula; distally, base of 5th MT
- Actions: evert foot, weakly plantarflexes ankle
Identify the Superficial fibular nerve and Describe its course
i. Superficial fibular nerve (L4-S1)
1. Lateral compartment n., terminal branch of common fibular n.
2. Supplies muscles in lateral leg and carries on as a cutaneous n., supplies skin on anterior leg and dorsum of foot
Clinical: Shin splints, Foot drop
Identify the Deep Fibular nerve. Describe its course
L5-S2
passing through the anterior crural intermuscular septum to innervate muscles of the anterior compartment of the leg
