Semimembranosus

Pointer Plus The Pointer Plus is an easy to use trigger point (TP) locator which incorporates a push button stimulation feature to immediately treat Trigger point pain.

 

The Biceps Femoris, Semitendinosus, and Semimembranosus, which are posterior thigh muscles, comprise the Hamstring muscle group.

Anatomical Attachments:

• Origin: Attaches to the posterior aspect of the ischial tuberosity.
• Insertion: Attaches to the posteromedial condyle of the tibia.

Action: Flexes and rotates the leg internally when the knee is flexed and also extends the thigh.

Synergist:  

• Prime Movers: Gluteus maximus, Adductor magnus (posterior part).
• Accessory Movers: Semitendinosus, Biceps femoris (long head), Gluteus medius, Piriformis.

Antagonist: Iliopsoas, Pectineus, Tensor fasciae latae, Adductor brevis, Sartorius.

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Nerve Supply: Sciatic Nerve (L5, S1, S2).

Vascular supply: Profunda femoris artery.

• Primary: The pain refers upward to the gluteal fold, downward to the posterior thigh and the back of the knee, and occasionally to the calf.
• Satellite or associated triggers: Long head of Biceps femoris, Quadriceps femoris group, Gastrocnemius, Iliopsoas, Adductor Magnus, Quadratus Lumborum, Thoracic Paraspinals and Rectus Abdominis.

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Trigger Point Signs and Symptoms: The pain may be experienced while sleeping. The posterior leg pain is worsened during walking, and persistent sitting may result in deep buttocks, anterior thigh, or pain being experienced in the popliteal fossa. There is also pain when rising from a seated position.

Trigger Point Activating and Perpetuating Factors: Sitting in a chair where ones feet do not touch the floor for long periods of time.

Differential Diagnosis: (Segmental, Subluxation, Somatic dysfunction) L5 radiculopathy, S1 or S2 Nerve Compression, Postlaminectomy pain syndrome, Pulled or torn Hamstring, Sprain/Strain injury, Bruised ischial tuberosity, Bone cancer, Bone fracture, Deep vascular thrombosis (DVT), Multiple sclerosis, Lipedema, Rheumatoid Arthritis, Bursitis, Osteoarthritis, Tension Myalgia, Polymyalgia rheumatica, Systemic lupus erythematosus, Reflex sympathetic dystrophy (Complex regional pain syndrome), Fibromyalgia, Coxa Plana, Cauda equina syndrome, Eosinophilic fasciitis, Tetanus, Systemic infections or inflammation, Nutritional inadequacy, Metabolic imbalance, Toxicity, Side effects of medication.

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