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Vastus Intermedius

Region

Origin & Insertion

['Origin: Anterior and lateral shaft of femur', 'Insertion: Tibial tuberosity via patellar tendon']

Synergistic Muscles

['Vastus lateralis', 'Rectus femoris']

Joints

['Knee']

Primary Actions

['Knee extension']

Nerve & Spinal Segment

Femoral nerve

Lumbar plexus; L2–L4

Interesting

Deep to rectus femoris. [Netter’s]

Reversal of Action

Raise pelvis during sit-to-stand

Common Dysfunctions

Weak knee extension, post-surgical atrophy

How to Stretch

Deep knee bend with posterior pelvic tilt.

Trigger Points

How to Strengthen

Seated leg extension drills.

Concentric Action

Extend knee

Applications:

Deep quad muscle, strengthens terminal extension phase

Eccentric Action

Control knee flexion

Isotonic Action

Knee extension machine

Related Conditions

['Quad strain', 'Post-op weakness']

Isometric Action

Hold leg in extended position

Exercise Ideas

['Leg press', 'Quad hold', 'Knee extension']

Related Blogs

Images

Videos

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