Semimembranosus Muscle

Kim (94) has demonstrated the degradation of myofibrillar proteins purified from porcine semimembranosus muscle by porcine leukocyte lysosomal proteinases. Troponin treated with leukocyte lysosomal pro-teinases mixed with tropomyosin did not result in the normal increase in viscosity of this system. The emulsifying capacity of aetomyosin treated with lysosomal proteinases at 37 °C and pH 7 for 12 hr was higher than that of aetomyosin incubated without enzymes. On the other hand, aetomyosin treated with papain had low emulsifying capacity because of extensive degradation. Control aetomyosin incubated at 37 °C, pH 7 for 12 hr formed a gel after removal of KC1, but aetomyosin treated with lysosomal proteinases or papain did not gel. 

Shantha, N.C., Moody, W.G., and Tabeidi, Z. (1997) Conjugated Linoleic Acid Concentrations in Semimembranosus Muscle of Grass- and Grain-Fed and Zeranol-Implanted Beef Cattle, J. Muscle Foods 8, 105—110. 

The gluteus maximus, biceps femoris semtte-ndinosus, and semimembranosus muscles create extension. This is best evaluated with the patient prone and the knees extended. 

Hamstrings. The hamstrings are three muscles, the semimembranosus, semitendinosus, and biceps femoris. All originate at the tuberosity of the ischium and insert on to various areas of the fibula and tibia. They are two-joint muscles that extend the hip and flex the knee. Both motions are interdependent and will affect each other s function. Dysfunctions are commonly found at the ischium, at the lateral aspect of the knee, and at the pes anse-rinus bursa. 

Fig. 12.8. Anatomy of the posterior (ischiocrural) muscles and tendons of the hip. Schematic drawing of a posterior view through the hip illustrates the insertion of the posterior muscles onto the ischial tuberosity (IT). The gluteus maximus (Gma) is shown in a semitransparent rendering over the ischiocrural muscles. Beneath it, observe the semimembranosus (sm), semi-tendinosus (st) and long head of the biceps femoris (Ihb) muscles. The semimembranosus has a separate tendon (I), whereas the semitendinosus and the long head of the biceps arise from the lateral aspect of the ischial tuberosity (IT) through a common tendon (2). Note the relationships between these muscles and the sciatic nerve (SN). GT, greater trochanter...

In summary, one should remember that the semitendinosus and the biceps femoris muscles arise from a common tendon located over the semimembranosus tendon. This conjoined tendon inserts into the lateral aspect of the ischial tuberosity rather than into its inferior face. Shifting the transducer downwards on transverse planes, the first muscle which appears is the semitendinosus, followed by the lateral biceps femoris and, more distally, by the medial semimembranosus. The sciatic nerve is... 

Three ischiocrural (hamstring) muscles are found in the posterior compartment the biceps femoris, the semimembranosus and the semitendinosus (Fig. 13.12). All originate from the ischial tuberosity and insert distally onto the medial aspect of the tibia... 

The popliteal space is a rhombic space bounded proximally by the semimembranosus and semitendinosus (medially) and the biceps femoris (laterally) muscles and distally by the medial and lateral heads of the gastrocnemius (Fig. 14.8a). The fossa appears... 

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