5.1 Anatomy of the Muscular System: Intro Part 2 Flashcards
What is the innervation of a skeletal muscle?
the peripheral nerves that supplies the muscle with a message from the brain
What is the action of the triceps?
primary extensor of the forearms
What is the innervation of the biceps brachii?
musculotaneous nerve
How are muscles generally studied?
in groups
What is CN in regards to the muscular system?
cranial nerve
How many pairs of cranial nerves are there?
12
Where do cranial nerves originate?
ventral surface of the brain
What are the muscles of facial expression?
orbicularis oculi
orbicularis oris
zygomaticus major/minor
risorius
frontallis
buccinator
masseter
temporalis
What is the action of the orbicularis oculi?
eye closure
What is the innervation of the orbicularis oculi?
CN VII (facial nerve)
What is the action of the orbicularis oris?
mouth closure (lips close, lips protrude forward, lips press against teeth)
What is the innervation of the orbicularis oris?
CN VII (facial nerve)
What is the action of the zygomaticus minor/major?
pulls corners of lips upward
What is the innervation of the zygomaticus major/minor?
CN VII (facial nerve)
What is the action of the risorius?
pulls that corners of the mouth posteriorly (grin/grimace)
