Page 179 - Biomedical Engineering and Design Handbook Volume 1, Fundamentals

156 BIOMECHANICS OF THE HUMAN BODY

Epimysium
A

Perimysium

Blood vessel

B
Endomysium

Myofibril

Nucleus
Sarcolemma
C A
I

Z H
Z
Thick filament M
D Thin filament

Z M Z
Cross-bridge

E
Thick filament

Thin filament
FIGURE 7.2 Structural organization of skeletal muscle from macro to micro level. Whole
muscle (a), bundles of myofibrils (b), single myofibril (c), sarcomere (d), and thick (myosin)
filament and thin (actin) filament (e). All symbols are defined in the text. [Modified from
Enoka (1994).]