Histology - Muscle Tissue Images
Thin filaments in muscle tissue are primarily composed of actin, along with tropomyosin and troponin (in skeletal and cardiac muscle). They interact with thick filaments (myosin) to enable contraction. In longitudinal section, smooth muscle fibers appear elongated and spindle-shaped with central nuclei. There are no striations, and cells are arranged in sheets or layers.

Thin Filament
Key Terms
Thin Filament
Smooth Muscle - Longitundinal and cross sectional
Myoepithelial - Eccrine Sweat Glands - ecotoderm derived
Smooth Muscle - trichrome
Cardiac Muscle - striated, derived from mesoderm, rich capillary beds in intercellular connective tissue
Muscle Spindle
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| Term | Definition |
|---|---|
Thin Filament | |
Smooth Muscle - Longitundinal and cross sectional | |
Myoepithelial - Eccrine Sweat Glands - ecotoderm derived | |
Smooth Muscle - trichrome | |
Cardiac Muscle - striated, derived from mesoderm, rich capillary beds in intercellular connective tissue | |
Muscle Spindle | |
Myoepithelial - Eccrine Sweat Glands - ecotoderm derived | |
T-Tubule | |
Smooth Muscle | |
macula adherens (desmosomes) - cardiac tissue | |
Contracting thin and thick filaments in hexagonal pattern | |
Purkinje Fibers | |
Type II skeletal muscle - fast glycolytic - anaerobic respiration | |
Cardiac Muscle | |
Neuromuscular synapse showing junctional folds and synaptic vessels | |
Duchenne muscular dystrophy skeletal muscle | |
Myosin Molecule | |
Intercalcated Discs in Cardiac Tissue | |
Type 1 Skeletal Muscle - slow oxidative - aeroboic respiration | |
Skeletal Muscle Cross Section | |
fascia adherens (zonula adherens) | |
Sarcomere | |
corckscrew nucleus | |
Sarcomere | |
Neuromusclular synapse | |
Skeletal Muscle | |
Thick Filament | |
Cardiac muscle - cross section |