Striations means a series of ridges, furrows or linear marks, and is used in several ways:
- Glacial striation
- Striation (fatigue), in material
- Striation (geology), a striation as a result of a geological fault
- Striation Valley, in Antarctica
- In hyperbolic geometry, a striation is a reflection across two parallel mirrors.
- In anatomy, striated muscle
- Ballistic fingerprinting
What does striation mean anatomy?
What does striation mean in anatomy? of Muscles. When used in the context of the anatomy of muscle structures, the word striations refers to the stripe-like visual features found in skeletal muscle. These visual features consist of alternating light and dark striations that can be observed using just a simple light microscope.
What does striated mean in anatomy?
What are striations in anatomy? Medical Definition of striated muscle : muscle tissue that is marked by transverse dark and light bands, that is made up of elongated fibers, and that includes skeletal and usually cardiac muscle of vertebrates and most muscle of arthropods — compare smooth muscle, voluntary muscle. Click to see full answer.
What does striation mean?
Striations means a series of ridges, furrows or linear marks, and is used in several ways: Glacial striation. Striation (geology), a striation as a result of a geological fault. Striation Valley, in Antarctica. In hyperbolic geometry, a striation is a reflection across two parallel mirrors.
What are striations in science?
Striations means a series of ridges, furrows or linear marks, and is used in several ways: Striation (geology), a striation as a result of a geological fault. Striation Valley, in Antarctica. In hyperbolic geometry, a striation is a reflection across two parallel mirrors.
Why are skeletal and cardiac musculature striated?
Microscopically both the skeletal and cardiac musculature have a “striated” appearance due to their densely packed myofibrils. Therefore they are referred to as striated muscle tissue. However, they differ partly in their histology and physiology.
Where are myosin filaments located?
In the center of the A-bands runs the M-line where the myosin filaments are anchored. The actin filaments are attached to the Z-line which is found in the middle of the I-bands. The area between two Z-lines makes up a functional unit, the sarcomere. The myosin filaments bind to the actin filaments through cross bridges. The contraction of the muscle results from the ATP-dependent rowing motion of the myosin heads causing a shift of the actin filaments.
What are the spindle shaped nuclei?
Histologically noticeable are the spindle shaped nuclei located peripherally. The eosinophilic sarcoplasm (=cytoplasm) comprises almost completely of myofibrils. Along the myofibrils runs the longitudinal (L-) system (=sarcoplasmic reticulum). The sarcolemma (=cell membrane) is surrounded by a basal lamina and deeply invaginates into the sarcoplasm forming the transverse (T-) tubules. The bright bands are referred to as isotropic (I-) bands, the dark bands as anisotropic (A-) bands. In the center of the A-bands runs the M-line where the myosin filaments are anchored. The actin filaments are attached to the Z-line which is found in the middle of the I-bands. The area between two Z-lines makes up a functional unit, the sarcomere. The myosin filaments bind to the actin filaments through cross bridges. The contraction of the muscle results from the ATP-dependent rowing motion of the myosin heads causing a shift of the actin filaments.
What is the skeletal muscle?
Skeletal muscle is the tissue that most muscles attached to bones are made of. Hence the word "skeletal". Cardiac muscle, on the other hand, is the muscle found on the walls of the heart.
What is the function of the skeletal musculature?
Function and innervation. The skeletal musculature is part of the locomotor system and has the task of moving and stabilizing the skeleton. Therefore they are attached to the bones by collagen-rich tendons. But also other organs such as the tongue, mimic musculature and the diaphragm consist of skeletal musculature.
Which system controls the innervation of skeletal muscles?
The innervation is carried out by the somatic nervous system so that (almost) all skeletal muscles may be controlled voluntarily. A motor neuron and its associated muscle fibers make up a motor unit. Fine muscles (e.g. outer eye muscles) have small motor units and therefore can be controlled more precisely in comparison to gross muscles (e.g. back muscles).
What is a striation?
striation. One of multiple, usually parallel grooves or scratches on a rock surface, produced by abrasion associated with glacial movement, stream flow, a geologic fault, or meteoric impact. See more at glacial striation shatter cone slickenside. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt ...
What is striated condition?
striated condition or appearance. a stria; one of many parallel striae. Geology. any of a number of scratches or parallel grooves on the surface of a rock, resulting from the action of moving ice, as of a glacier. Cell Biology. any of the alternating light and dark crossbands that are visible in certain muscle fibers, ...
What is the term for a number of scratches or parallel grooves on the surface of a rock?
Geology. any of a number of scratches or parallel grooves on the surface of a rock, resulting from the action of moving ice, as of a glacier.
Do sharks have linear striation?
Most modern sharks have linear striation s on their scales, which may offer some boost to their swimming efficiency.
Is the striation of the cones still present?
The striation of the cones is still present, but is not nearly so clear as it was in the earlier stage.
Who designed the striated mountain shapes?
Harry Feiner designed the constructivist set of striated mountain shapes dominated by an ominous, inverted, black wedge that hovered over the performers, portending strife--but the bird's hopeful magic prevailed.
What are the structures of the respiratory tract?
These structures were the exoskeleton, hypodermal layer, tracheae (a portion of the respiratory tract), digestive tract, striated muscle, head, posterior end, and developing eggs.
Which muscle keeps the shell tightly closed?
Despite the different functions of the two different types of adductor muscle, for the adductor muscle, metal concentrations were similar in both the striated muscle, which enables swimming movements, and the smooth muscle, which keeps the shell tightly closed (Chantler 1991).
Is the striated sphincter relaxed?
Normally the striated sphincter is relaxed, but there is still closure of the smooth muscle of the internal sphincter.
