Thigh and knee muscles

What

Pectinius

Origin pectinus

Superior ramus of pubis

Distal Attachment Pect

Pectineal line of femur

Action(s) pect

Adducts and flexes thigh; assists with medial rotation

Rami pectinius

L2, L3

Nerve pectinius

Femoral, branch from obturator n.

Origin sarorius

ASIS

Insertion of sartorius

Superior medial surface of tibia

Actions of sartorius

flexes, weakly abducts, and laterally rotates thigh at hip joint; flexes leg at knee joint (medially rotating leg when knee is flexed)

Nerve sartoriuus

Femoral n

Rami sartorius

L2, L3

Origin of rectus femoris

ASIS, and illum superior to acetabulum

Origin vastus lateralis

Greter trochanter, and lateral lip of linea aspera

Origin vasutus medialis

Intertrochanteric line and medial lip of linea aspera

Origin of vastus intermedius

Anterior and lateral surfaces of shaft of femur

Insertion of recrus femoris, vastus lateralis, medialis, and intermedius

Patela, via patella to tibial tuberosity

Actions of quadriceps femoris

Extend leg at knee, rectus also stadies hip joint and flexes thigh

Innervation rectus femoris

Femoral n.

What nerve roots quadriceps femoris

L2, L3, L4

Whre doe sarticularis genu start from

vastus intermedius

Where does articualris genu attach

Synovial memb of joint and supropatellar bursa

Function of articularis genu

Pulls synovial memb superiorly to avoid ir pinching btwn the femur and patella

What is 1

Rectus femoris

2

Vastus medialis

4

Vastus intermedius

Origin of adductor longus

body of pubis, inferior to crest

Insertion of adductor longus

Middle third of linea aspera

Actions of adductor longus

Adducts thigh

Innervation of adductor longus

Obturator n.

Innervation of adductor longus (rami)

L2, L3, L4

Origin of adductor brevis

Body of pubis and inferior to crest

Insertion of adductor brevis

Pextineal line and proximal part of linea aspera

Actions of adductor brevis

Adducts thigh, flexes

What nerve adductor brevis

obturator n.

Rami adductor brevis

L2-L4

Origin of adductor magns (Adductor)

Inferior pubic ramus, and ramus of ischium

origin of adductor magnus (hamstring)

Ischial tuberosity

Insertion of adductor magnas adductor portion

Gluteal tuberosity, linea aspera, and supracondyler line

Insertion of aductor magnus hamstring

adductor tubercle of femur

Action of adductor part of adductor magnus

Flexes thigh

Action of hamstring of adductor magnus

Extends thigh

Innervation of aductor part of adductor magnus

Obturator

Innervation of hamstring part of adductor

Tibial division of sciatic n.

Rami of adductor part of adductor magnus

L2-L4

Rami of the hamstring portion of adductor magnus

L4

Origin gracillis

body and inferior ramus of pubis

Insertion gracilis

superior part of medial surface of tibia

Actions of gracillis

adducts thigh, flexes leg, medial rotation

Nerve gracillis

Obturator nerve

Rami gracillis

L2, L3

Origin obt externus

obturator foramen and membrane

Insertion obt externus

Trochanteric fossa of femur

Actions of obt externus

lateral rotation of thigh and stabilizes femur in acetabulum

Obt externus Nerve

Obturator n.

Rami obt nerve

L3, L4

Semitendinosus origin

Ischial tuberosity

Insertion of distal attachment

Medial surface of superior tibia

Actions of semitendinosus

extends thigh, flexes leg, can medially rotate thigh when leg is flexed. When thigh and leg are flexed, can also extend trunk

Innervation of semitendinosus

Tibial div of sciatic n.

Rami Semitendinosus

L5, S1, S2

Origin semimembranosus

ischial tuberosity

Insertion of semimembranosus

posterior part of media condyle of tibia

Actions of semimembranosus

extends thigh, flexes leg, can medially rotate thigh when leg is flexed. When thigh and leg are flexed, can also extend trunk

Innervation Semimembrnosus

Tibial division of sciatic

Rami semimembranosus

L5, S1, S2

Biceps femoris origin long head

Ischial tuberosity

Biceps femoris short head origin

linea aspera and lateral supracondylar line of femur

Distal attachment of biceps femoris

lateral side of head of fibula

Actions of bicep femoris

Flexes leg and rotates it laterally when knee is flexed; extends thigh (important in acceleration during first step of gait

Innervation long head biceps femoris

Tibial division of sciatic n.

Innervation of short head of biceps femoris

Common fibular div

Biceps femoris rami

L5, S1, S2