Muscles Flashcards
Motor neuron fiber innervation
AEGIS (alpha=extrafusal; gamma=intrafusal)
Predominantly inhibitory; facilitate lateral inhibition
Renshaw cell
Detects muscle length and rate of change in muscle length
Muscle spindle
Detects changes in muscles tension
Golgi tendon
Plasma membrane that surrounds a muscle fiber
Sarcolemma
Invaginations of sarcolemma in close proximity to the terminal cisternse of the sarcoplasmic reticulum
Transerse tubules
Sarcoplasmic reticulum
Endoplasmic reticulum surrounding myofibril
Functional unit of the muscle
Sarcomere
Thick filaments
Myosin
Thin filaments
Actin,tropomyosin, troponin
Attaches troponin complex to tropomyosin
Troponin T
Inhibits actin myosin bindig
Troponin I
Calcium binding protein
Troponin C
Tethers myosin to Z line
Titin
Stabilized sarcolemma and prevents contraction induced rupture
Dystrophin
Binds actin to z lines
Activin
Binds z lines to sarcolemma
Desmin
Acts as a molecular ruler that sets the length of actin during assembly
Nebulin
All muscles fibefs innervated by a single motor nerve
Motor unit
Two major propioceptors
Muscle spindle, golgi tendon organ
Detects changes in muscle tension
Golgi tendon
Detecta changes in muscle length and rate of change of muscle length
Muscle spindles
