Biceps Femoris Ebook
Musculocutaneous Nerve Sixth Cervical Root, Biceps and Brachialis Muscles The patient should be supine with his arms at his sides and his elbows flexed to 30-45 degrees. His arms are supine. Stand on the right side of the examining table to examine the right biceps reflex. Put your left index and middle fingers on the biceps tendon as shown in Figure 13-2A. Push your lingers into the antecubital fossa and partially supinate your hand, stretching the skin in the antecubital fossa. This lengthens the biceps tendon and puts it very slightly on the stretch. Then hit your fingers with the hammer. Keep the direction of the hammer head parallel to the long axis of the biceps muscle as in Figure 13-2B. A normal response is contraction of the biceps muscle, usually not strong enough to cause forearm flexion. With a suprasegmental lesion other muscles (eg, finger flexors or brachioradialis) may contract and there may be a greater contraction of the biceps, often causing forearm flexion. With a...
As its name implies, the biceps femoris (bi'seps fem'or-is) has two heads, one attached to the ischium and the other attached to the femur. This muscle passes along the back of the thigh on the lateral side and connects to the proximal ends of the fibula and tibia. The biceps femoris is one of the hamstring muscles, and its tendon (hamstring) Biceps femoris Biceps femoris Biceps femoris (short head) Biceps femoris Biceps femoris (short head) Biceps femoris Biceps femoris (long head) Long head of biceps femoris Short head of biceps femoris
Serratus anterior pectoralis minor muscles that move the arm coracobrachialis pectoralis major teres major latissimus dorsi supraspinatus deltoid subscapularis infraspinatus teres minor muscles that move the forearm biceps brachii brachialis brachioradialis triceps brachii supinator pronator teres pronator quadratus muscles that move the hand flexor carpi radialis flexor carpi ulnaris palmaris longus flexor digitorum profundus flexor digitorum superficialis extensor carpi radialis longus extensor carpi radialis brevis extensor carpi ulnaris extensor digitorum
Achilles' tendon Adductor longus Adductor magnus Biceps femoris Gracilis (X2) Gastrocnemius (X2) Gluteus maximus Gluteus medius Rectus femoris Sartorius Semimembranosus Semitendinosus Soleus Tensor fascia lata Tibialis anterior Vastus lateralis (X2) Vastus medialis FORELEG Biceps brachii Brachialis Brachioradialis Triceps brachii Biceps femoris
Some of the muscles of the appendicular musculature act on a single joint. These are called monoarticular muscles. Gluteus maximus, the major muscle group of the buttocks, is a monoarticular muscle it only acts on the hip joint. Other muscles may act at two or more joints. For example, the hamstring muscle, the semitendinosus and biceps femoris, traverses two joints and acts both on the hip and the knee. These muscles have the capacity to extend at the hip and flex at the knee. The quad muscle, rectus femoris, and the calf muscle, gastrocnemius, also act on two joints and as such are called biarticular muscles. What is the advantage of having polyarticular muscles in the human body A plausible answer to this question may be that biarticular muscle, by affecting two joints at front of arm (biceps) front of arm (biceps) Figure 1.12a-g. Schematic diagrams of various muscles involved in motion latis-simus (a), pectoralis (b), triceps (c), biceps (d), semitendinosus of the hamstrings (e),...
When a person beats another in arm wrestling, the force he exerts on the opposing party has the same level of intensity as the force the losing party exerts on him (Fig. 2.2b). It is just that the winning party is able to continue to contract his biceps muscles while the biceps of the opposing person is yielding to the external load. The third law may be counterintuitive also because we rarely observe equality in nature things are either bigger or smaller, heavier or lighter, and so on. Newton arrived at this counterintuitive law by considering the data on the impact of two pendulums (Fig. 2.2c). The motion of the bobs after collision could only
The large muscle on the anterior surface of the upper arm is the biceps brachii. This muscle has two origins, thus its name biceps . The function of the biceps brachii is to flex the foreleg. In the cat the pectoantebrachialis extends from the sternum across the pectoralis major and the biceps brachii to end on the ulna. The pectoantebrachialis has no homologue in humans as was discussed in chapter sixteen. Deep to the pectoantebrachialis is the brachialis. The antagonist of the biceps brachii is located on the posterior surface. It is the triceps brachii. As you might suspect it has three origins. The biceps brachii, brachialis, and triceps brachii are also found on the human arm.
On the lateral surface of the leg in the cat is the large biceps femoris. The biceps femoris is the third hamstring. On a human all of the hamstrings are located posteriorly. Anterior to the biceps femoris are the vastus lateralis and the tensor fascia lata which were observed from the medial side.
The biceps brachii (bi'seps bra'ke-i) is a fleshy muscle that forms a long, rounded mass on the anterior side of the arm. It connects the scapula to the radius and flexes the forearm at the elbow and rotates the hand laterally (supination), as when a person turns a doorknob or screwdriver (fig. 9.29). The brachialis (bra'ke-al-is) is a large muscle beneath the biceps brachii. It connects the shaft of the humerus to the ulna and is the strongest flexor of the elbow (fig. 9.29).
Some muscles have more than one origin or insertion. The biceps brachii in the arm, for example, has two origins. This is reflected in its name biceps, meaning two heads. As figure 9.20 shows, one head of the muscle is attached to the coracoid process of the scapula, and the other head arises from a tubercle above the glenoid cavity of the scapula. The muscle extends along the anterior surface of the humerus and is inserted by a single tendon on the radial tuberosity of the radius. When the biceps brachii contracts, its insertion is pulled toward its origin, and the elbow bends. The biceps brachii has two heads that originate on the scapula. This muscle is inserted on the radius by a single tendon. The biceps brachii has two heads that originate on the scapula. This muscle is inserted on the radius by a single tendon. The movements termed flexion and extension describe changes in the angle between bones that meet at a joint. For example, flexion of the elbow joint refers to a movement...
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