Skeletal Muscles-Attachments & Nerves and Blood Supply Flashcards
What is the position of skeletal muscles?
extends from one bone to another, crossing at least one moveable joint (some span two)
What do the bones do during contraction?
one bone is moved while the other remains fixed
less moveable
origin
more moveable
insertion
How do the insertion and origin move during contraction?
the insertion is pulled towards the origin
Which is the more proximal attachment(usually)?
origin
Which is the more distal attachment(usually)?
insertion
Where do muscles attach?
origins and insertions of the bone
How are the muscles attached?
with strong fibrous CT that extend into periosteum of bone
Describe direct attachment
attaching strands are so short-muscle appears to be connected to bone
Describe indirect attachment
connective tissue extends well beyond the end of muscle fibres
Which type of attachment is more common?
indirect
What does aponeurosis mean?
flattened out tendon
-thin sheath of CT that helps connect muscles to bones
What are aponeuroses made of?
3 layers of CT
Describe the connection of aponeuroses with the bone
-they penetrate the matrix of the bones to which they attach
-the bones have raised markings where the tendons meet the bone
