Muscles of the Back : Deep Layer Flashcards
Name the muscles in each of the 3 layers of the deep layer of the back.
superficial : splenius capitis, splenius cervicis
Intermediate: Spinalis, Longissimus, iliocostalis
Deep: Semispinalis, Multifidus, Rotatores
What 2 muscles are in the superficial layer of the deep layer of the back?
Splenius capitis, Splenius cervicis
What are the attachments for Splenius Capitis and what are the avaliable actions?
Sp of C4-T2 to Mastoid process and lateral superior nuchal line
action: unilat contrac = ipsi rot
bilat contrac = ext of the neck
What the attachments for the Splenius Cervicis and what are the avaliable actions?
SPs to T3-5 to C1-4 TVPs
actions: unilat contrac = ipsilat rot
Bilat contrac = ext of the neck
what muscles make up the intermediate layer of the back muscles?
Spinalis longissimus, iliocostalis
The spinalis sits in what spinal structure?
The laminar groove
what are the 3 sections of the spinalis muscle?
thoracis
cervicis
capitis
The spinalis muscle attaches along what spinal structures?
SPs
The Longissimus attaches along what spinal structures?
TVPS
what are the 3 sections of the longissimus called?
Thoracis
Cervicis
Capitis
What spinal structure does the longissimus attaches to at each of it’s 3 sections?
Thoracis (TVPs of thoracic spine)
Cervicis ( TVPs of cervical spine)
Capitis (mastoid process)
What are the 3 sections of the iliocostalis?
lumborum
thoracis
cervicis
What spinal structure does the iliocostalis attach long?
Lumborum ( Angle of ribs 8-12)
Thoracis (angle of ribs 1-7)
Cervicis ( TVPs of C3-6)
Collectively what are the actions avaliable to the erector spinae?
unilat = lat flex of the vertebral column bilat = ext of the vertebral column
What are the 3 muscles that make up the deep layer of the deep layer of the back?
Semispinalis
Multifidus
Rotatores
The semispinalis attaches to the vertebrae of the spine but it skips how many vertebrae approx between attachements?
skips 3-6 vertebrae
What are the 3 sections of the semispinalis called?
Thoracis
cervicis
capitis
What are the actions avaliable to the Semispinalis?
bilat = ext of head and neck unilat = contalat rot of the neck
The Multifidus attaches from what portion of the spine to what portion and skips how many vertebrae at a time?
S4 - C2
skips 1-3 vertebrae
What are the actions avaliable to the multifidus?
bilat = ext of the spine/ stabilization unilat = lat flex , contralat rot
which muscle in the deep layer of the deep layer of the back is the largest mass in the posterior neck? ( the one you can visibly see if someone exts there head)
Semispinalis
in what spinal structure is the rotatores located in?
Deepest mm in the laminar groove
what are the actions avaliable to the rotatores?
bilat = stabilization unilat = contralateral rotation
