Deep Back Flashcards
Nerves supplying epaxial division muscles
dorsal primary rami
Nerves supplying hypaxial division muscles
ventral primary rami
Muscles derived from epaxial divsion
deep extensor muscles of back
Muscles derived from hypaxial division
infrahyoid
flexor muscles of vertebral column
quadratus lumborum
What are the only muscles of the body innervated by dorsal primary rami
intrinsic back muscles
Splenuis group
arise from posterior midline of back
proceed laterally and superiorly to their insertion
most superficial group
Erector spinae group
arise from posterior midline of back or more laterally
run up longitudinally
largest muscle mass of back
origin from common tendon of origin
Transversospinalis group
arise laterally
travel midline to their insertion
lies deeper to erector spinae group
Suboccipital muscles
do not follow pattern
responsible for movement of head and neck only
Semispinalis
lacking in lumbar region
lies superficial to multifidus
Multifidus
deeper to semispinalis
thicker in lumbar region
Segmental muscles
deepest part of transversospinalis group.
better developed in cerivical and lumbar regions
contains - interspinalis, intertranscersarii, rotatores
Suboccipital Triangle contains
obilique capitis inferior, oblique capitis superior, and rectus capitais posterior major
What does flexion in the vertebral column
anterior trunk muscles
What does extenstion in vertebral column
mostly erector spinae
All others do as well except for intertransversarii
What does lateral flexion of the vertebral column
intertransversarii
Splenius capitis and cervicus
erector spinae initiates lateral flexion unilateraly
What do muscles on the opposite side of the flexion do
relax gradually
What rotates the trunk to the opposite side
multifidi, rotators, and semispinalis muscles
What rotate the truck to the same side
spenius muscles and erector spinae
What rotates the atlas/turns the face to the same side
oblique capitis inferior and rectus apitis posterior major
What extends the head bilaterally and flex to same side unilaterally
oblique capitius superior and rectus capitus posterior major
What is the suboccipital triangle innervated by
Innervated by dorsal ramus of C1
What artery goes through the suboccipital triangle
vertebral artery goes through it.
What nerve lies below the suboccipital triangle
Greater occiptal nerve is below it
