Thigh

rectus femoris

REK-tus FEM-or-is

The rectus femoris is the central quad muscle crossing both hip and knee, visible as the teardrop above your knee. It flexes the hip and extends the knee, powering sprints, jumps, and squats. Balanced development prevents knee pain in athletes.

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Common Pain & Injury

Pain feels like sharp anterior thigh ache during kicking or stairs, often from strains. Overuse leads to tendinopathy. See a doctor for swelling, bruising, or inability to bear weight.

Anatomy & Function

Origin

Anterior inferior iliac spine (front of hip bone) and acetabulum rim

Insertion

Patella (kneecap) via patellar tendon to tibial tuberosity (shin bone top)

Actions

Hip flexion (lifting knee)
Knee extension (straightening leg)
Stabilizes patella

Innervation

Femoral nerve (L2-L4)

Muscle Relationships

Antagonists

HamstringsGluteus maximus

Synergists

Vastus lateralisVastus medialisVastus intermedius

Trigger Points

Mid-thigh; refers pain down to knee and shin.

Stretches

1Standing quad stretch

2Lunge hip flexor stretch

3Thomas stretch

Common Conditions

Rectus femoris strainQuadriceps tendinopathyPatellofemoral pain syndrome

Anatomical Parts

Right rectus femorisLeft rectus femoris

FAQ

What does rectus femoris do?

Flexes hip and extends knee; key for running, jumping, and squatting.

Rectus femoris pain causes?

Strains from sudden kicks or tight hip flexors; stretch regularly to prevent.

How to stretch rectus femoris?

Deep lunges or Thomas stretch target it best since it crosses two joints.

Rectus femoris tear symptoms?

Sudden thigh pain, swelling, and weakness-ice and rest initially.

Also Works rectus femoris

10

Atlas Stone Trainer position 1

Atlas Stone Trainer position 2

Atlas Stone Trainer

intermediate·other

Atlas Stones position 1

Atlas Stones position 2

Atlas Stones

Axle Deadlift position 1

Axle Deadlift position 2

Axle Deadlift

intermediate·other

Balance Board position 1

Balance Board position 2

Balance Board

beginner·other

Barbell Deadlift position 1

Barbell Deadlift position 2

Barbell Deadlift

intermediate·barbell

Bent Press position 1

Bent Press position 2

Bent Press

expert·kettlebells

Box Jump (Multiple Response) position 1

Box Jump (Multiple Response) position 2

Box Jump (Multiple Response)

beginner·other

Box Skip position 1

Box Skip position 2

Box Skip

beginner·other

Carioca Quick Step position 1

Carioca Quick Step position 2

Carioca Quick Step

Clean position 1

Clean position 2

Clean

intermediate·barbell

Related Thigh Muscles

The biceps femoris is the lateral hamstring on the back of the thigh, with long and short heads forming a thick band from hip to knee. It flexes the knee, extends the hip, and rotates the leg outward, vital for running, jumping, and deadlifts. Key for posterior chain power and injury prevention.

Long, thin medial thigh muscle adducting and flexing knee. Aids cutting movements in soccer, stabilizing in squats.

iliotibial tract

The iliotibial tract (IT band) is a thick fibrous band down the outer thigh from hip to knee, stabilizing the leg during running and single-leg stands. Tight ITB causes knee pain in runners; mobility work prevents issues.

The sartorius is the longest muscle in the body, spiraling from hip to inner knee, forming a 'tailor's muscle' for crossing legs. It flexes, abducts, and rotates the hip plus flexes the knee, key for soccer kicks and agility drills. Balances quad-dominant training.

semimembranosus

The semimembranosus is a posterior thigh hamstring forming the teardrop at knee back, flexing knee and extending hip. Powers deadlifts, lunges, and deceleration in sports. Prevents ACL strains by stabilizing.

Semitendinosus is the slender medial hamstring with a long tendon, flexing knee and extending hip. Aids in medial knee stability for cutting sports. Complements semimembranosus for balanced posterior chain.

vastus intermedius

Deep central quad muscle under rectus femoris, extends knee powerfully. Core quad for squats and jumps.

vastus lateralis

Largest quad on outer thigh, massive knee extender for lateral stability in lunges and sprints.

Thigh Pain Guide

Common causes and relief

Activities & Sports

See which activities use rectus femoris