Striated muscle tissue

striated musclestriationsstriatedstriated musclesmuscleStriated muscular fibersmuscle striationsmuscle tissueskeletalstriated cells
Striated muscle tissue is a muscle tissue that features repeating functional units called sarcomeres.wikipedia
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Sarcomere

sarcomeresZ-discZ-discs
The functional unit of a muscle fiber is called a sarcomere.
A sarcomere (Greek σάρξ sarx "flesh", μέρος meros "part") is the complicated unit of striated muscle tissue.

Sarcolemma

cell membranecell membrane (sarcolemma)cell membrane of the muscle fiber
Each muscle fiber contains sarcolemma, sarcoplasm, and sarcoplasmic reticulum.
The sarcolemma (sarco (from sarx) from Greek; flesh, and lemma from Greek; sheath) also called the myolemma, is the cell membrane of a striated muscle fiber cell.

Muscle tissue

musclemuscle fibresmuscular
Cardiac muscle is involuntary, striated muscle that is found in the walls and histological foundation of the heart, specifically the myocardium.

Myocyte

muscle fibermuscle cellmuscle cells
Each myofiber is composed of actin and myosin myofibrils repeated as a sarcomere.
The striated cells of cardiac and skeletal muscles are referred to as muscle fibers.

Mitochondrion

mitochondriamitochondrialmitochondrial membrane
Two other characteristics that differentiate striated muscle from smooth muscle are that the former has more mitochondria and contains cells that are multinucleated.
This latter reaction ”fills up” the amount of oxaloacetate in the citric acid cycle, and is therefore an anaplerotic reaction, increasing the cycle's capacity to metabolize acetyl-CoA when the tissue's energy needs (e.g. in muscle) are suddenly increased by activity.

Smooth muscle

smooth muscle cellssmooth musclessmooth muscle cell
Smooth muscle is an involuntary non-striated muscle.

Skeletal muscle

skeletal musclesskeletalmuscle
It is a form of striated muscle tissue, which is under the voluntary control of the somatic nervous system.

Cardiac muscle

myocardiumheart musclemyocardial
It is an involuntary, striated muscle that constitutes the main tissue of the walls of the heart.

Human musculoskeletal system

musculoskeletalmusculoskeletal systemlocomotor
Skeletal and cardiac muscles have striations that are visible under a microscope due to the components within their cells.

T-tubule

T-tubulestransverse tubulesT tubule
Striated muscle tissue contains T-tubules which enables the release of calcium ions from the sarcoplasmic reticulum.

Sarcoplasmic reticulum

sarcoplasmicsarcoplasmic reticulum (SR)sarco
Each muscle fiber contains sarcolemma, sarcoplasm, and sarcoplasmic reticulum. Striated muscle tissue contains T-tubules which enables the release of calcium ions from the sarcoplasmic reticulum.

Epimysium

epimysia
Skeletal muscle is wrapped in epimysium, allowing structural integrity of the muscle despite contractions.

Perimysium

perimysial
The perimysium organizes the muscle fibers, which are encased in collagen and endomysium, into fascicles.

Endomysium

endomysialendomysial layerendoymsium
The perimysium organizes the muscle fibers, which are encased in collagen and endomysium, into fascicles.

Muscle fascicle

fasciculifasciculusfascicles
The perimysium organizes the muscle fibers, which are encased in collagen and endomysium, into fascicles.

Sarcoplasm

intramuscular fluidmuscle
Each muscle fiber contains sarcolemma, sarcoplasm, and sarcoplasmic reticulum.

Pericardium

epicardiumpericardialpericardial cavity
Cardiac muscle lies in between the epicardium and the endocardium in the heart.

Endocardium

endocardialendo-inner surface of the heart
Cardiac muscle lies in between the epicardium and the endocardium in the heart.

Intercalated disc

intercalated discsintercalated disksintercalated disk
These cells are connected to each other by intercalated disks, which contain gap junctions and desmosomes.

Gap junction

Gap junctionscommunicating junctionsgap-junctions
These cells are connected to each other by intercalated disks, which contain gap junctions and desmosomes.

Desmosome

desmosomesdesmosomaldesmosomal cadherins
These cells are connected to each other by intercalated disks, which contain gap junctions and desmosomes.

Cardiac pacemaker

pacemakerpacemaker cellscardiac pacemakers
Contractions in cardiac muscle tissue are due to pacemaker cells.

Cardiac action potential

action potentialphase 1 of the cardiac action potentialautomaticity
Pacemaker cells have autorhythmicity.

Motor neuron

motor neuronsmotormotor development
Signals from motor neurons cause myofibers to depolarize and therefore release calcium ions from the sarcoplasmic reticulum.

Mysia

ancient MysiaHellespontusPhrygia Epictetus
In the skeletal muscles connected to tendons that pull on bones, the mysia fuses to the periosteum that coats the bone.