MusclesSummary 1. The muscle fibre is regarded as a bundle of myofibrils, embedded in a viscous matrix, the sarcoplasm, the whole being surrounded by a delicate sheath, the sarcolemma. 2. The sarcolemma is a thin, apparently structureless membrane. Preliminary study with the electron microscope ...
The primitive insect, in acquiring the power of flight, must initially have used the existing thoracic musculature to produce the deformation of the thoracic wall required to move the wings: the dorso-ventral muscles inserted on the leg ... OW Tiegs - 《Philosophical Transactions of the Royal ...
base of theskulland surrounding structures. Both circular andlongitudinalmuscles occur in the walls of the pharynx; the circular muscles form constrictions that help pushfoodto the esophagus and prevent air from being swallowed, while the longitudinal fibres lift the walls of the pharynx during...
Muscle - Types, Structure, Function: Muscle fibres differ from species to species of animal and between parts of the same animal. Apart from the distinction between voluntary and involuntary muscles, muscles differ in structure and activity. Muscles dif
Muscles perform a wide range of motile functions in animals. Among various types are skeletal and cardiac muscles, which exhibit a steady auto-oscillation of force and length when they are activated at an intermediate level of contraction. This phenomenon, termed spontaneous oscillatory contraction or...
The young wild boar muscles showed higher values of textural parameters. The muscle fibre cross-section area and the area of intramuscular fatty tissue of the juvenile wild boar muscles were lower than those in the piglet meat, while the peri- and endomysium were thicker. Of the piglet and ...
Muscles can also be described in terms of their contractile velocity, which reflects their relative aerobic or anaerobic metabolism:1 Type I fibres are abundant in myoglobin, mitochondria, and capillaries. They have a slow conduction velocity and as a result are very fatigue resistant. Type IIa fi...
The structure of skeletal muscle In very simple terms, each muscle comprises bundles of muscles fibres which are made of bundles of myofibrils. Myofibrils divide along their length into Sarcomeres. Connective tissue runs through the muscles surrounding the various elements. ...
We review new data derived from careful dissection studies on the macroscopic anatomy, innervation and function of the lumbar muscles, as well as information on the fibres in these muscles. The new findings correct previous misconceptions of the functional anatomy of the lumbar muscles. The innervati...
4. 4. The flexor muscle bundles consist of a uniform population of muscle fibres, of the fast type, with relatively long sarcomeres (5–9 μm) and show both fast and slow contraction depending on which efferent axon is stimulated. 5. 5. However, there are some differences between the ...