The symptoms of a stroke are different, depending on where in the brain the stroke is located, and doctors can use the symptoms to pinpoint the site of the stroke. In the case of a brain stem stroke, the patient often experiences vertigo, slurred speech, and difficulty speaking.
The smallest functional unit in a myofibril is a sarcomere. A sarcomere is composed of thin (actin) and thick (myosin) filaments. Actin slides past myosin when the muscle contracts.
Myofibril is the name given to cylindrical structures that extend along the complete length of each muscle cell. Recall that muscle cell = muscle fibre = muscle fiber (Am.Sp.). See the diagram below for further detail about the structure of myofibrils and their location within muscle cells.