The teres minor muscle is a skeletal muscle that belongs to the shoulder musculature. It forms part of the rotator cuff, which holds the upper arm bone (humerus) to the shoulder. Damage to the teres minor muscle or its nerve can affect the stability of the cuff and increase the likelihood of shoulder dislocation (luxation). … Musculus Teres Minor: Structure, Function & Diseases
The infraspinatus muscle extends between the scapula, glenohumeral joint capsule, and greater humerus. It is part of the striated (skeletal) musculature and is important for external rotation, abduction, and adduction of the arm. As part of the rotator cuff, it can be damaged if the cuff ruptures. What is the infraspinatus muscle? A person normally … Infraspinatus Muscle: Structure, Function & Diseases
The sarcomere is a small functional unit within the muscle: Lined up one behind the other, they form the filament-like myofibrils that are grouped together to form muscle fibers. Electrical stimulation by nerve cells causes the filaments within a sarcomere to push into each other, causing the muscle to contract. What is the sarcomere? There … Sarcomere: Structure, Function & Diseases
As the external tongue muscle, the hyoglossus muscle is involved in swallowing, speaking, sucking, and chewing, pulling the tongue backward and downward. Functional limitations are often due to problems with the hypoglossal nerve, which supplies the muscle neuronally. What is the hyoglossus muscle? The hyoglossus muscle is one of a total of four external tongue … Hyoglossus Muscle: Structure, Function & Diseases
Myosin belongs to the motor proteins and is responsible, among other things, for the processes involved in muscle contraction. There are several types of myosins, all of which participate in transport processes of cell organelles or in displacements within the cytoskeleton. Structural abnormalities in the molecular structure of myosin can be causes of muscle diseases … Myosin: Function & Diseases
Definition of striated musculature Transverse striated muscle is the name given to a certain type of muscle tissue because under polarizing light (for example, a simple light microscope) it looks as if the individual muscle fiber cells have regular transverse striation. Normally, the term is used synonymously for skeletal musculature, since this type of tissue … Striated Musculature
Excitation of the striated musculature An important feature of the striated muscles, precisely to distinguish them from the smooth muscles and the heart muscles, is that they are subject to our arbitrary control. ́Quergestreifte Muscles can be consciously tensed or relaxed by us. They are reached by motor nerve fibers, at the end of which … Excitation of the striated musculature | Striated Musculature
Definition A muscle fiber (also: muscle fiber cell, myocyte) is the smallest unit of a skeletal muscle; the muscle cells of the smooth muscle and the heart muscle show certain similarities to the muscle fibers, but are not called so. Structure of a muscle fiber A muscle fiber is a so-called syncytium. This means that … Muscle Fiber
Composition In total, a muscle fiber consists of about three-quarters water, 20% protein (half of which is provided by the contractile proteins actin and myosin) and 5% ions, fats, glycogen (an energy store) and nitrogenous substances. Types of muscle fibers Two different types of muscle fibers are distinguished by their function. On the one hand … Composition | Muscle Fiber
The longitudinalis inferior muscle is one of the internal tongue muscles. Its fibers run longitudinally through the tongue and cause various tongue movements. In hypoglossal palsy, the longitudinalis muscle fails along with other tongue muscles, usually causing discomfort during swallowing and speaking. What is the inferior longitudinalis muscle? The longitudinalis inferior muscle is located in … Inferior Longitudinalis Muscle: Structure, Function & Diseases
Troponin is a complex of three globular protein subunits. As a component of the muscle contractile apparatus, troponin regulates muscle contraction. It carries special significance in the diagnosis of myocardial infarction. What is troponin? Troponin, as a component of the actin filament, is part of the contractile unit of skeletal and cardiac muscles. It is … Troponin: Structure, Function & Diseases
