Exam II Lecture 1 Flashcards
Muscles of the superficial posterior compartment
Plantaris
Med/Lat gastrocnemius
Soleus
Tendo calcaneus
Gastrocnemius crosses
Both knee and ankle joint
Two heads of gastrocnemius come from
Inferior boundary of popliteal fossa
Deep posterior compartment muscles
Popliteus Tibialis posterior Peroneus longus Flexor digitorum longus Peroneus brevis Flexor hallucis longus People bitch pop took players for drinks for having long practices lately
Popliteus function/location
Floor of popliteal fossa
Flexes/rotates knee
Flexor digitorum longus location/function
Posterior to medial malleolus and tendon of tibialis posterior
Plantarflexes foot at ankle joint
Tibia characteristics
Most commonly fractured long bone
Poor blood supply
Anteromedial surface is bare (available for bone graft)
Soleal (oblique) line on posterior surface
Fibula characteristics
Lateral malleolus important in ankle stability
Site for muscle attachment
Crural fascia is continuous with ___ which
Fascia latae, which attaches to anterior and medial borders of tibia
Forms retinacula in foot
Superior retinaculum
Binds tendons in anterior crural compartment
Inferior (extensor) retinaculum
Y-shaped
Flexor retinaculum
Binds tendons of deep posterior compartment
DPC
Superior/inferior peroneal retinacula
Binds tendons of lateral crural compartment
LCC
Superficial posterior compartment cutaneous nerves
Lateral sural cut nerve- from common peroneal
Medial sural cut nerve- from tibial nerve
Sural nerve runs with
Lesser saphenous vein
Flexor hallicus longus
Tendon occupies groove on posterior surface of talus
Passes posterior to medial malleolus
Passes b/w two sesamoid bones
-Push-off muscle for walking/jumping/running
Tibialis posterior function
Plantar flexion and foot inversion
Maintain medial longitudinal arch
Nerve/blood supply tibialis posterior
Nerve- tibialis nerve
Blood- Posterior tibial artery
Tibialis anterior location/function/paralysis result
Lateral to crest of tibia
Foot dorsiflexion/inversion
Paralysis leads to foot drop
Extensor digitorum longus tendons/function
4 tendons that insert on extensor expansion like in hand
-Toe extension at MTP and dorsiflexion
Anterior compartment muscles
Tibialis anterior Extensor digitorum longus Extensor hallucis longus Peroneus tertius TAEDL EHL PT
Peroneus tertius part of what/function
Part of extensor digitorum longus
Sometimes missing
Foot dorsiflexion/eversion
Innervation of anterior compartment is done by, location of nerve, accompanies what
Deep peroneal nerve
Runs deep to extensor digitorum longus
Accompanies anterior tibial artery b/w EHL and TA
Blood supply of anterior compartment by, branch of what, begins where, becomes what
Anterior tibial artery
Branch of popliteal artery
Begins at inferior border of popliteus
Becomes dorsalis pedis artery at ankle joint
Lateral compartment muscles
Peroneus (fibularis) longus
Peroneus (fibularis) brevis
Peroneus longus vs brevis
More superficial, easily palpated
Peroneus longus tendon
Tendon uses lateral malleolus as a pulley
Crosses sole of foot and inserts of first metatarsus and cuneiform
Peroneus longus function
Helps maintain transverse and longitudinal arches of the foot
Peroneus brevis location/insert/function
Deep to peroneus longus
Inserts on lateral tuberosity
Plantar flexion and foot eversion
Lateral compartment nerve supply-location/insert
Superficial peroneal nerve
Deep to peroneus longus
Inserts on lateral tuberosity
Blood supply to lateral compartment
No major arteries in this compartment
Muscular branches arise from peroneal artery
Peroneal artery is branch of
Posterior tibial artery
