The document discusses the muscles of the anterior compartment of the thigh. It describes the sartorius muscle, which runs down the length of the thigh over the hip and knee joints. It then discusses the quadriceps femoris, which consists of four muscles - the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius. Together they form the bulk of the thigh and are among the most powerful muscles. The document provides details on the origin, insertion, innervation and actions of each of these muscles.

2. MEDICAL ONLINE
LMS
BY ABEER ALI TARIQ

3. TODAY’SLECTUREIS
ALLABOUTTHE
MUSCLEOFANTERIOR
OREXTENSOR
COMPARTMENTOF
THIGH

4. MUSCLEOFANTERIOROREXTENSORCOMPARTMENTOFTHIGHARE
FOLLOWINGBELOW:
• SARTORIUS
• QUARDRICEPS FEMORIS
Rectusfemoris
Vastuslateralis
Vastusmedialis
Vastusintermedius
• Articularisgenu

5. SARTORIUSMUSCLE:
• Thesartoriusmuscleisathin,long,superficial
muscleintheanteriorcompartmentofthe
thigh.
• Itrunsdownthelengthofthethigh,runsover
2joints—hipandkneejointsandisthelongest
muscleinthehumanbody.

6. SARTORIUSMUSCLE:
• ANEXCEPTIONALLENGTHOFTHISMUSCLEOFTENEXCEEDS50CM.
• INSUCHLONGMUSCLESNOTALLMUSCLEFIBRESRUNTHROUGHTHEWHOLELENGTHOF
THEMUSCLEBELLY.
• ITISESTIMATEDTHATATTHEMOST30–50%OFFIBRESRUNFROMTENDONTOTENDON.[2]
• THERESTOFTHEMENDINTRAFASCICULARLY.
• THELENGTHOFASINGLEFIBREISESTIMATEDAT35–45CM.

7. SARTORIUSMUSCLE:
• JUSTLIKEANS-SHAPEDTAPE,THEMUSCLEBELLYTWISTSAROUNDTHEANTERIOR,
ANDMEDIALSURFACEOFTHE THIGH.
• ITPASSESBEHINDTHEMEDIALCONDYLEOFTHEFEMURTOENDINATENDON.
• THETENDON,AFTERTAKINGANANTERIORCURVEJOINSWITHTHETENDONOFTHE
GRACILISANDSEMITENDINOSUSINTHEPESANSERINUSBEFOREITSFINAL
INSERTION.

8. SARTORIUSMUSCLE:
• ETYMOLOGY:
• SARTORIUSDERIVESFROMTHELATINWORDSARTOR,MEANINGTAILOR,
ANDITISOCCASIONALLYREFERREDTOASTHETAILOR'SMUSCLE.
• THISNAMEWASCHOSENINREFERENCETOTHECROSS-LEGGEDPOSITIONIN
WHICHTAILORSONCESAT.

9. SARTORIUSMUSCLE:
•ORIGIN: ANTERIORSUPERIORILIACSPINE.
•INSERTION: THESUPEROMEDIALSURFACEOFTHETIBIA.
•NERVESUPPLY:. FEMORALNERVE.
•ACTION:
•ATTHEHIPITFLEXES,WEAKLYABDUCTS,ANDROTATESTHE
THIGHLATERALLY.ATTHEKNEE,ITCANFLEXTHELEG;WHEN
THEKNEEISFLEXED,ITALSOROTATESTHELEGMEDIALLY.

10. QUADRICEPSFEMORIS:

11. QUADRICEPS FEMORIS:
• THEQUADRICEPSFEMORISISAHIPFLEXORANDA
KNEEEXTENSOR.ITCONSISTSOFFOURINDIVIDUAL
MUSCLES;THREEVASTUSMUSCLESANDTHE
RECTUSFEMORIS.THEYFORMTHEMAINBULKOF
THETHIGH,ANDCOLLECTIVELYAREONEOFTHE
MOSTPOWERFULMUSCLESINTHEBODY.

12. QUADRICEPSFEMORIS:
ITISLOCATEDINTHEANTERIORCOMPARTMENTOFTHETHIGH.THEFOUR4SUB-COMPONENTS
BEING:
1. RECTUSFEMORIS
2. VASTUSLATERALIS
3. VASTUSMEDIALIS
4. VASTUSINTERMEDIUS

13. ORIGIN
•THEMUSCLESTHATFORMTHEQUADRICEPSFEMORISUNITE
PROXIMALTOTHEKNEEANDATTACHTOTHEPATELLAVIA
THEQUADRICEPSTENDON.INTURN,THEPATELLAISATTACHED
TOTHETIBIABYTHEPATELLALIGAMENT.

14. VASTUSLATERALIS:
•PROXIMALATTACHMENT:ORIGINATES
FROMTHEGREATERTROCHANTERANDTHE
LATERALLIPOFLINEAASPERA
•.ACTIONS:EXTENDSTHEKNEEJOINTAND
STABILISESTHEPATELLA.

15. VASTUSINTERMEDIUS
•PROXIMALATTACHMENT:ANTERIOR
ANDLATERALSURFACESOFTHEFEMORAL
SHAFT.
•ACTIONS:EXTENDSTHEKNEEJOINTAND
STABILISESTHEPATELLA.

16. VASTUSMEDIALIS
•PROXIMALATTACHMENT:THE
INTERTROCHANTERICLINEANDMEDIALLIPOF
THELINEAASPERA.
•ACTIONS:EXTENDSTHEKNEEJOINTAND
STABILISESTHEPATELLA,PARTICULARLYDUETO
ITSHORIZONTALFIBRESATTHEDISTALEND.

17. RECTUSFEMORIS
•ATTACHMENTS:ORIGINATESFROMTHEILIUM,JUSTSUPERIOR
TOTHEACETABULUM. ITRUNSSTRAIGHTDOWNTHELEG(THE
LATINFORSTRAIGHTISRECTUS),ANDATTACHESTOTHE
PATELLABYTHEQUADRICEPSFEMORISTENDON.
• ACTIONS:THEONLYMUSCLEOFTHEQUADRICEPSTOCROSS
BOTHTHEHIPANDKNEEJOINTS.ITFLEXESTHETHIGHATTHE
HIPJOINT,ANDEXTENDSATTHEKNEEJOINT.

18. NERVE
Innervation of
these muscles is
by the femoral
nerve. (L2, L3,
L4)

19. FUNCTION
•THEQUADRICEPSALLWORKTOEXTEND(STRAIGHTEN)THE
KNEE.THERECTUSFEMORISALSOFLEXESTHEHIP,THEVASTUS
MEDIALISADDUCTSTHETHIGHANDALSOEXTENDSAND
EXTERNALLYROTATESTHETHIGHANDSTABILIZESTHE
KNEECAP

20. ARTICULARISGENU
• origin:Anteriorsurfaceoffemur
• Insertion:Suprapatellarbursa/
synovialmembraneofkneejoint.
• Nervesupply:femoralnerve.
• Action:pullsthesynovialmembrane
upwardsduringextensionoftheknee
,thuspreventingdamagetoit.

21. AnyQuestion..???