muscles of lower limb
-
Upload
mythili-neelakandan -
Category
Health & Medicine
-
view
257 -
download
7
description
Transcript of muscles of lower limb
MYOLOGY
POSTERIOR & LATERAL COMPARTMENT OF CALF
Presented By, MYTHILI.N
Posterior compartment of calf muscles
Superficial set muscles
Gastrocnemius
Soleus
Plantaris
POSTERIOR COMPARTMENT OF CALF
DEEP SET POPLITEUS
FLEXOR HALLUCIS LONGUS
FLEXOR DIGITORUM LONGUS
TIBIALIS POSTERIOR
Superficial set muscles
GASTROCNEMIUsIt Is Large Superficial Muscle & Lies Superficial To The Soleus. The Two Heads & Soleus Together To Form Triceps Surae
ORIGIN
Lateral head: Posterior Surface Of Lateral
Condyle Of Femur And Highest Of Three
Facets On Lateral Condyle.
medial head: Posterior Surface Of Femur
Above Medial Condyle
INSERTION
Tendo calcaneus to middle of three
facets on posterior aspect of calcaneus
GASTROCNEMIUsNERVE
Tibial nerve (S1, S2)
Action
Plantar flexes foot.
Flexes knee
SOLEUSIt Is A Sole Shaped Multipennate Muscle Lies
Deep To The Gastrocnemius
ORIGINSoleal line
Middle third of posterior border of tibia
Upper quarter of posterior shaft of fibula including neck
INSERTION
Tendo calcaneus to middle of three facets
on posterior surface of calcaneus
SOLEUS
NERVETibial nerve (S1,S2)
ACTION
Plantar flexes foot (aids venous return)
Anti graving muscle
Steadies leg on foot when standing
plantarisit vestigeal in human beings. It has a short belly & a long tendon
ORIGIN
Lateral supracondylar ridge of
femur above lateral head of
gastrocnemius and oblique popliteal
ligament of knee joint
INSERTION
Tendo calcaneus (medial side,
deep to gastrocnemius tendon)
PLANTARISNERVE
Tibial nerve (S1, 2)
ACTION
Plantar flexes foot and flexes
knee
Assist gastrocnemius in action
DEEP SET
MUSCLES
POPLITEUS
ORIGIN
Posterior shaft of tibia above soleal line and below tibial condyles
INSERTION
Middle of three facets on lateral surface of lateral condyle of femur.
Tendon passes into capsule of knee to posterior part of lateral meniscus
POPLITEUSNERVE Tibial nerve (L5,S1)
ACTION Unlocks extended knee by lateral rotation of
femur on tibia.
Pulls back lateral meniscus
FLEXOR HALLUCIS LONGUSORIGIN
Lower Two Thirds Of Posterior Fibula
Between Median Crest And Posterior
Border,
Lower Intermuscular Septum And
Aponeurosis Of Flexor Digitorum Longus
INSERTION
Base Of Distal Phalanx Of Big Toe
And Slips To Medial Two Tendons Of Flexor
Digitorum Longus
FLEXOR HALLUCIS LONGUS
NERVETibial Nerve
ACTION
Flexes Distal Phalanx Of Big Toe
Flexes Foot At Ankle,
Supports Medial Longitudinal Arch
FLEXOR DIGITORUM LONGUS
ORIGIN
Posterior Shaft Of Tibia Below Sole
Al Line And By Broad Aponeurosis
From Fibula
INSERTION
Base Of Distal Phalanges Of Lateral
Four Toes
FLEXOR DIGITORUM LONGUS
NERVE Tibial nerve (S1, S2)
ACTION
Flexes distal phalanges of lateral
four toes and foot at ankle.
Supports lateral longitudinal arch
TIBIALIS POSTERIOR
Origin
Upper Half Of Posterior Shaft Of Tibia
Upper Half Of Fibula Between
Medial Nerve Crest Interosseous
Border, And Interosseous Membrane
INSERTION
Tuberosity Of Navicular Bone And All
Tarsal Bones (Except Talus) And
Spring Ligament
TIBIALIS POSTERIOR
NERVE Tibial nerve (L4, L5)
ACTION
Plantar flexes and inverts foot
Supports medial longitudinal
arch of foot
MUSCLES OF LATERAL COMPARTMENT OF LEG
Peroneus longus
Peroneus brevis
Peroneus Longusit is superficial to peroneus brevis
Origin
Head Of Fibula, Upper 1/2 - 2/3 Of
Lateral Fibular Shaft Surface;
Also Anterior And Posterior
Intermuscular Septa Of Leg
Insertion
Plantar Posterolateral Aspect Of
Medial Cuneiform And Lateral
Side Of 1st Metatarsal Base
Peroneus LongusInnervation
Superficial Peroneal Nerve (L5, S1, S2); May
Also Receive Additional Innervation From Common Or
Deep Peroneal Nerves (L5, S1, S2)
Arterial Supply
Anterior Tibial And Peroneal Arteries
ActionEverts foot and plantar
flexes ankle; also helps to support the transverse arch of the foot
PERONEUS BREVISlies deep to peroneus longus
ORIGIN
Lower Two Thirds Lateral Shaft Of Fibula
Anterior & Posterior Inter Muscular
Septa
INSERTION
Tuberosity Of Base Of 5th Metatarsal
PERONEUS BREVIS
ACTION
Weak plantar flexor of foot
evertor of foot .
Supports lateral longitudinal
arch
NERVE
Superficial peroneal nerve (L5, S1)
Thank you