Sarcoplasm

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Sarcoplasm

Muscle system
Latin	sarcoplasma
Code	TH H2.00.05.0.00004

The sarcoplasm of a muscle fiber is comparable to the cytoplasm of other cells, but it houses unusually large amounts of glycosomes (granules of stored glycogen) and significant amounts of myoglobin, an oxygen binding protein. The calcium concentration in sarcoplasma is also a special element of the muscular fiber by means of which the contractions takes place and regulates.

It contains mostly myofibrils (which are composed of sarcomeres), but its contents are otherwise comparable to those of the cytoplasm of other cells. It has a Golgi apparatus, near the nucleus, mitochondria just on the inside of the cytoplasmic membrane or sarcolemma, as well as a smooth endoplasmic reticulum organized in an extensive network.

External links

Histology: Muscle tissue (TH H2.00.05, H3.3)

Membrane/
extracellular

DAP:	Sarcoglycan SGCA SGCB SGCD SGCE SGCG SGCZ Dystroglycan

Sarcospan Laminin, alpha 2

Intracellular

Dystrophin Dystrobrevin A B Syntrophin A B1 B2 G1 G2 Syncoilin Dysbindin Synemin/desmuslin

related:	NOS1 Caveolin 3

Sarcomere/
(a, i, and h bands;
z and m lines)

Myofilament

Tropomyosin

Troponin
- T
- C
- I

Connective tissue

General

Cardiac
muscle

Both

Fiber	Muscle fiber intrafusal extrafusal Myofibril Microfilament/Myofilament Sarcomere

Cells	Myoblast/Myocyte Myosatellite cell

Other	Desmin Sarcoplasm Sarcolemma T-tubule Sarcoplasmic reticulum

Other/
ungrouped

M: MUS, DF+DRCT

anat (h/n, u, t/d, a/p, l)/phys/devp/hist

noco (m, s, c)/cong (d)/tumr, sysi/epon, injr

proc, drug (M1A/3)

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