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Several roles: It serves to extend, adduct, transversely extend, and internally rotate the shoulder. It works with other muscles to provide extension and lateral flexion of the lower spine area. ...Read more
Hi, sirwhen we holding 5kg mass steady both flexor and extensor contracted but how about when lifting the mass upwards?Will the extensor also contract?
Co-contraction: Simultaneous contraction of antagonist muscles is known as co-contraction. This creates a stabilizing or dampening effect on the involved limb. For example, when holding a drill in space and attempting to control how deep it plunges, your biceps and triceps co-contract around your shoulder and elbow. In some conditions (eg brachial plexus injuries) pathologic co-contraction can limit function. ...Read more
They help each other: When holding a weight up, against gravity, both flexors and extensors should contract, but with those muscles doing most of the work doing most of the contracting, and the other muscles on the other side of the arm just contracting a little bit to keep the person in balance, and to control the steadiness of the arm. ...Read more
Stiffen & load joint: Think of your knee as a great example. Both the quadriceps and hamstring span across the knee joint. If you contract both the quadricep (extensor) and hamstring muscles (flexor), your essentially lock your knee in a fixed position or at least significantly increase the load felt across your knee joint throughout an active arc of motion. ...Read more
Hi.When we holding 5 kg mass steady, our flexor and extensor contracted but why when we lifting the mass upward extensor does not contract?
Contract differently: When holding a weight up, against gravity, both flexors and extensors should contract, but with those muscles doing most of the work doing most of the contracting, and the other muscles on the other side of the arm just contracting a little bit to keep the person in balance, and to control the steadiness of the arm. ...Read more
My mom is 66. She is having severe cramping in the flexor and extensor muscles of her left hand and forearm. She is also having lower back pain.
Needs exam: There are a variety of conditions that may cause your mother's symptoms. Many of them can be ruled out by an exam and some labs. I would suggest starting with her regular DR who knows her medical history the best. ...Read more
Could a deep cut on the volar side of the thumb cut the extensor tendon while leaving the flexor tendon intact?
EDM to small finger: Extensor Digiti Minimi is a thin muscle of the forearm. It arises from the common Extensor tendon by a thin tendinous slip, from the intermuscular septa. Its tendon runs through a compartment of the dorsal carpal ligament then divides into two as it crosses the hand, and finally joins the expansion of the Extensor digitorum communis tendon on the dorsum of the first phalanx of the little finger ...Read moreSee 1 more doctor answer