Human Anatomy 2300--Burgood Lec #8
Human Anatomy 2300--Burgood Lec #8 Anatomy 2300
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This 2 page Class Notes was uploaded by Isabella Bowling on Wednesday February 3, 2016. The Class Notes belongs to Anatomy 2300 at Ohio State University taught by Dr. Burgoon in Spring2015. Since its upload, it has received 36 views. For similar materials see Human Anatomy in Anatomy at Ohio State University.
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Date Created: 02/03/16
Anatomy 2300Lec#8 MUSCLES OF LEG AND FOOT Muscles of Leg --Crural Fascia: deep fascia that invests and covers all the muscles of the leg. Keeps pressure of muscles inward and down to tendons. --Muscles are divided into three compartments --Anterior compartment… innervation = deep fibular (peroneal) nerve. 1. Tibialis anterior --Action = Dorsiflexion of foot, extensor of toes 2. Extensor digitorum longus --Action = Extends digits 2—5, dorsiflexes foot 3. Extensor halluces longus --Action = Extends hallus, dorsiflexes foot 4. Fibularis (peroneus) tertius --Action = Dorsiflexes foot, everts foot --Lateral compartment… innervation = superficial fibular (peroneal) nerve. 1. Fibularis (peroneus) longus 2. Fibularis (peroneus) brevis --Action for both = plantar flexes foot, everts foot --Innervation for both = superficial fibular (peroneal) nerve --Posterior compartment … Innervation for both = tibial nerve 1. Superficial Group 1. Gastrocnemius… has two heads. Combined with the soleus = triceps surae produces 94% of the power needed to do plantar flexion (walking) --Action = plantar flexes foot (ankle), flexes leg (knee) 2. Soleus --Action = Plantar flexes foot (ankle) 3. Plantaris --Plantar flexes foot (ankle), flexes leg (knee) 2. Deep group… 1. Popliteus --Action = flexes leg (knee), medially rotates tibia (helps to unlock the knee) 2. Flexor hallucis longus --Action = flexes hallux, plantar flexes foot 3. Flexor digitorum longus --Action = flexes digits 2-5, plantar flexes foot, and inverts foot 4. Tibialis posterior --Action = plantar flexes foot, inverts foot Muscles of the foot --The intrinsic muscles are divided into those found on the dorsum of the foot and those found on the plantar aspect of the foot. Intrinsic = originate and insert in the same region. --Extensor Digitorum Brevis --Action = extends digits 1—4 --Innervation = deep fibular (peroneal) nerve --Abductor Hallucis --Action = abducts hallux --Innervation = medial plantar nerve --Flexor digitorum brevis --Action = flexes digests 2—5 --Innervation = medial plantar nerve --Abductor digiti minimi --Action = abducts fifth digit --Innervation = lateral plantar nerve
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