X. Erector Spinae (Sacrospinalis Musculature) Flashcards
Which muscles represent the fourth layer of the true back?
the erector spinae or sacrospinalis muscles
Which muscles are identified as erector spinae or sacrospinalis muscles?
iliocostalis, longissimus, spinalis
What muscles are classically identified as iliocostalis muscles?
iliocostalis lumborum, iliocostalis thoracis, and iliocostalis cervicis
What is the innervation of the iliocostalis lumborum?
dorsal rami of lower thoracic and all lumbar spinal nerves
What osseous part of the vertebral column serves as an insertion for the iliocostalis thoracis?
transverse process of C7
Which subdivision of the iliocostalis primarily originates and inserts on ribs?
iliocostalis thoracis
What is the innervation of the iliocostalis thoracis?
dorsal rami of upper 6 thoracic spinal nerves (T1-T6 cord levels)
What is the innervation of the iliocostalis cervicis?
dorsal rami of T1, T2 spinal nerves, sometimes C8 spinal nerve (C8, T1, T2 cord levels)
Which erector spinae muscle is attached to the accessory process?
longissimus thoracis
What is the innervation of the longissimus thoracis?
dorsal rami of all thoracic and lumbar spinal nerves (cord levels T1-T12, L1-L5)
What is the innervation of the longissimus cervicis?
dorsal rami of C4-C8 and T1-T2 spinal nerves (C4-C8 and T1-T2 cord levels)
What is the innervation of the longissimus capitis?
dorsal rami of C1-C3 or C4 spinal nerves, (C1-C3 or C4 cord levels)
Which erector spinae muscles attach to cervical articular processes?
longissimus cervicis and longissimus capitis
What is the innervation of the spinalis thoracis?
dorsal rami of all thoracic and upper spinal nerves
What is the innervation of the spinalis cervicis?
dorsal rami of all cervical spinal nerves (C1-C8 cord levels)
