Muscle Flashcards
Myoblast origin
mesoderm
Endomysium make up
CT: reticular fibers and external lamina
Perimysium makeup
CT
Epimysium makeup
DCT
What is a muscle fascicle
Group of muscle fibers
Does skeletal muscle regenerate?
Yes-via satellite cells
Does cardiac muscle regenerate?
No
T tubules in cardiac muscle located?
At Z line
T tubules in skeletal muscle located at?
Junction of A-I bands
Dyad
Seen in cardiac muscle
One T tubule (at Z line) and one part of SR terminal end
Cardiac innervation
Involunatry
Cardiac muscle and mitochondria
Mito is very abundant in CM. Almost half of cell volume.
What’s at the ends of cardiac muscle?
Intercalated discs. Junction between cells ends=gap junctions that allows communication.
What muscles have and lack myofibrils
Have
Skeletal
Cardiac
Lack
Smooth muscle
Describe T tubules of the muscles
Skeletal
T tubules at junction of A-I bands
Cardiac
T tubules at Z lines
Smooth
Lack T tubules
What muscle is able to secrete ECM. What cell is this similar to in ECM production regards
Smooth
Similar to fibroblast
Cab smooth muscle regenerate?
Yes all byyyyyy themmmmselves
Pericytes can help too though.
What muscles have myofribrils and myofilaments
Cardiac and skeletal muscle have both
Smooth only has myofilaments (which are not highly organized). Lacks troponin
Dense body in smooth muscle
Z line
Unitary muscle smooth muscle
Few cells are innervated (works as syncytium via gap junctions). Muscle fibers form as band or bundles
Multi-unit smooth muscle
Inidividually innervated. No gap junctions. Muscle fibers are individually located.
