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Semimembranosus

Region

Origin & Insertion

['Origin: Ischial tuberosity', 'Insertion: Posterior medial condyle of tibia']

Synergistic Muscles

['Semitendinosus', 'Adductor magnus']

Joints

['Hip', 'Knee']

Primary Actions

['Hip extension', 'Knee flexion', 'Medial rotation of tibia']

Nerve & Spinal Segment

Tibial portion of sciatic nerve

Sacral plexus; L5–S2

Interesting

Deep to semitendinosus. [Netter’s]

Reversal of Action

Pull pelvis toward leg during bridge

Common Dysfunctions

Hamstring tightness, posterior knee pain

How to Stretch

Toe touch with inward rotation.

Trigger Points

How to Strengthen

Hamstring bridge holds.

Concentric Action

Extend hip and flex knee

Applications:

Postural hip control and eccentric strength in gait

Eccentric Action

Control leg swing or descent

Isotonic Action

Hamstring curls, hip thrusts

Related Conditions

['Hamstring strain', 'Knee tracking issues']

Isometric Action

Hold static bridge or knee flexion

Exercise Ideas

['Glute bridge walkouts', 'Swiss ball curls', 'RDL']

Related Blogs

Images

Videos

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