A-I junction

The A-I junction is the junction between the A and I bands of the sarcomere, which is the smallest unit of a muscle fiber. In skeletal muscle, the T tubule, an extension of the skeletal muscle plasma membrane, is located here.^[1]

References

↑ di Fiore, Mariano SH; Eroschenko, Victor P (2008). Di Fiore's Atlas of histology: with functional correlations. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins. p. 124. ISBN 0-7817-7057-2.

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

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