skeletal muscles Flashcards
(27 cards)
what is the shape of smooth muscles and how many nuclei are there
spidle shaped {fusiform}
uninucleated
central nucleus
what is the shape of cardiac muscle fibres and how many nuclei are there
they branch and anastomose
they have a single central nucleus
how many nuclei in skeletal muscle
they have mutiple prephiral nuclei
what ae muscles
they are contractile fibresthat are responsible for movement as tey become short in response to nerve impulse
what are skeletal muscles
they are muscles attached to skeleton to generate movement
describe a skeletal muscle
it has a belly and two or more attachements
types of attachement
origin
insertion
when is origin
the MORE fixed attachement
what is insertion
the MORE mobile attachement
what are they tissues that the skeletal muscle be attached to
- bone
- cartilage
- fascia
- ligament
- skin
- other muscles
how could the muscle be attached
directly by muscle tissue
through fibrous tisse
what are the types of fibrous tissue that the muscle could use to attach to the attachements
tendon
aponeurosis
a combination of muscle fibre and fibrous tissue
what are tendons
they are ROUNDED cord like white fibrous tissue
what are apeourosis
an EXPANDED sheet like white fibrous tissue
what muscles does the fixators help
prime movers
what are the types of skeletal muscles according to action
prime mover
anatagonist
synergist
fixators
what are prime movers
they innitiate the movement
what are anatagonists
they oppose the actione of anagonist
what are synergists
they are muscles they eliminate unwanted movement in the proximal joint when the distal joint is in action
ex of synergist
extensors of the wrist contract during flexion of the fingers to prevent unwanted flexion of the wrist during finger movement
what are fixators
they are muscles that help the prime movers by fixating their origin
ex of fixators
muscles that attach the shouldr girdle to the trunck to allow the deltoid to act on the shoulder joint
types of skeletal muscles according to joints they act on
uniarticular
biarticular
multiarticular
ex of uni articular
they cross and act on one joint
brachialis
