That would be a bone, covered by a muscle. Look at an anatomy book, you`d see some complicated, hosh-cosh name for it.
The simple subject of "his arm was twisted in the tackle on the thirty-yard line" is "arm".
The SS had their blood type tattooed under their left arm .
It is located under the hood, upper engine area, driver's side, mounted in fuel line. Hard to see and hard to replace, but it is there. Follow the fuel line and you will find it.
Under the arm "arm pit"
A PIC line does not go into an arm. They are designed to be a direct line into the heart for the administration of medication.
Hard to tell without seeing but it sounds like impetigo. Call your doctor.
When in half or full gaurd, pin the persons arm to the mat by their wrist. With your free hand, come under the opponents elbow/arm and grab a hold of your own wrist and pull back very hard and quickly.
Under the arm "arm pit"
if you fall on something hard like cement you can break your ankle or arm
from your wrist to your elbow on your right arm lay the pig on your arm just under its neck and your left arm just under its behind.
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If there is a red line moving across your arm, it might mean you were bitten by something and it gave you an infection. The red line is your tendon swelling. See a doctor immediatley