Hamstring Muscles

The Hamstrings are made up of three muscles.


Biceps Femoris:

Origin: Ischial Tuberosity of OS Coxa

Insertion: Head of Fibula and lateral condyl of Tibia

Nerve(s): Tibia (nerve), Sciatic (nerve) (S1-S3)

Synergist(s) (helpers): ∙Gracilis ∙Semimembranosus ∙Semitendinosus ∙Sartorius ∙Gastrocnemius ∙Flexion of the knee

∙Gluteus Maximus ∙Semitendinosus ∙Semimembranosus ∙Adductor Magus ∙Extension of hip

Antagonist(s) (opposite): ∙Rectus Femoris ∙Vastus Lateralis ∙Vastus Medialis ∙Vastus Intermedius ∙Flexion of the knee

∙Adductor Longus ∙Illopsoas ∙Sartorius ∙Rectus Femoris ∙Extension of hip

Action(s): ∙Flexes leg at knee ∙Laterally rotates leg at knee when knee is flexed ∙extends thigh at hip

Semimembranosus:

Origin: Ischial Tuberosity of OS Coxa

Insertion: Posterior medial condyle of Tibia

Nerve(s): Tibia (nerve), Sciatic (nerve) (C5, S1, S2)

Synergist(s) (helpers): ∙Gracilis ∙Biceps Femoris ∙Semitendinosus ∙Sartorius ∙Gastrocnemius

Antagonist(s) (opposite): ∙Rectus Femoris ∙Vastus Lateralis ∙Vastus Medialis ∙Vastus Intermedius

Action(s): ∙Flexes leg at knee ∙Medial rotates leg at knee when knee is flexed ∙extends thigh at hip

Semitendinosus:

Origin: Ischial Tuberosity of OS Coxa

Insertion: Proximal Tibial, medial to Tibial tuberosity

Nerve(s): Tibia (nerve), Sciatic (nerve) (L5, S1, S2)

Synergist(s) (helpers): ∙Gracilis ∙Semimembranosus ∙Biceps Femoris ∙Sartorius ∙Gastrocnemius ∙Flexion of knee

∙Gluteus Maximus ∙Long head of biceps Femoris ∙Semimembranosus ∙Adductor Magnus ∙Extension of hip

Antagonist(s) (opposite): ∙Rectus Femoris ∙Vastus Lateralis ∙Vastus Medialis ∙Vastus Intermedius ∙Flexion of knee

∙Adductor Longus ∙Illiopsoas ∙Sartorius ∙Rectus Femoris ∙Extension of hip

Action(s): ∙Flexes leg at knee ∙Medial rotates leg at knee when knee is flexed ∙extends thigh at hip

Biceps Femoris & Semimembranosus & Semitendinosus all have their origin at Ischial Tuberosity of Os Coxa.

~The muscles origin is attached to the immovable bone.

~At its other end, the insertion is attached to the movable bone.

~Body movement occurs when muscles contract across joints and their insertion moves towards their origin.

~Angular movements increase or decrease the angle between two bones.

~Flexion decreases the angle of the joint and brings the articulating bones closer.

~Extension is the reverse and increases the angle between bones such as straightening the knee.

~ Dorsiflexion is extension of the knee.

~Plantar flexion is extending the foot (pointing the toes).

~Abduction is movement of a limb away from the midline of the body.

~ Adduction is bringing it toward the midline.

Information is from: Basic Clinical Massage Therapy

Integrating Anatomy and Treatment Second Edition: James H. Clay/David M. Pounds

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Encouraging Health & Wellness by Sarah

for Body, Mind, & Soul.

Certified Massage Therapist

Sarah Colbenson CMT

 


 

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