sacrolemma
myofibril
nucleus
mitochondria
sacroplasmic reticulum
transverse tubule
triad
thin filament
thick filament
sacromere
A band
H zone
M line
Z disc
I band
zone of overlap
endomysium
muscle fiber
perimysium
fascicle
epimysium
external oblique
rectus abdominus
serratus anterior