The optic nerve is the nerve that connects the eye to the brain and carries the impulses formed by the retina to the visual cortex of the brain. The choroid is a thin vascular layer between the sclera and the retina that supplies blood to the retina and conducts arteries and nerves to other structures in the eye.
A muscle pull (or strain) occurs when you twist, pull, or tear your muscle or tendon, the strong elastic cord that connects your muscle to the bone. As we age we are more susceptible to muscle pulls. However, you risk a pull if you donât warm up properly before you exercise and stretch a muscle past its limit, train longer than what your body can handle, or if you push a past muscle injury too far before the muscle has had adequate time to heal.
The injury usually results from a hit to the muscle. For example, it may happen after a soccer player is kicked in the thigh or a football player is hit in the arm. When you have a deep bruise that bleeds a lot into the muscle, deposits of calcium may form in the muscle tissue as the bruise heals. This may happen over several months. Symptoms may include: 1  A muscle that feels hard or is larger than usual. 2  Pain, although usually it doesnât hurt. 3  Trouble moving your arm or leg.