Intrinsic Muscles of the back Flashcards
Posterior serratus superior insertion
superior border of 2nd - 4th ribs
Posterior serratus superior innervation
2nd - 5th intercostal nerves
Posterior serratus superior action
elevates ribs
posterior serratus inferior origin
T11-L2 (spinous process)
posterior serratus inferior insertion
inferior border near angle 8th - 12th ribs
posterior serratus inferior innervation
anterior rami of spinal nn T9-T12
posterior serratus inferior action
depresses ribs
Posterior serratus superior origin
ligamentum nuchae (nuchal ligament) C7-T3 spinous process
iliocostalis cervicis origin
3rd - 7th ribs
iliocostalis cervicis insertion
transverse processes of C4-C6
iliocostalis cervicis innervation
spinal nerves C8-L1
posterior rami, lateral branches
iliocostalis cervicis action
Bilaterally: extends spine
Unilaterally: bends spine laterally to the same side
iliocostalis thoracis origin
7th - 12th ribs
iliocostalis thoracis insertion
1st - 6th ribs
iliocostalis thoraacis innervation
spinal nerves C8-L1
posterior rami, lateral branches
iliocostalis lumborum action
Bilaterally: extends spine
Unilaterally: ends spine laterally to same side
longissimus capitis origin
transverse processes and articular processes of C4-C7
transverse processes of T1-T3
longissimus capitis insertion
mastoid process (temporal bone)
longissimus capitis innervation
Spinal nerve C1-L5 (posterior rami, lateral branches)
longissimus capitis action
Bilaterally: Extends head
Unilaterally: flex and extends head to same side
Longissimus cervicis origin
Transverse processes of T1-T6
longissimus cervicis insertation
transverse processes of C2-C5
longissimus cervicis innervation
spinal nerves C1-L5 (posterior rami, lateral branches)
longissimus thoracis origin
sacrum
iliac crest
lumbar vertebrae (spinous processes)
lower thoracic vertebrae (transverse processes
longissimus thoracis insertion
2nd-12th ribs lumbar vertebrae (costal facets) thoracic vertebrae (transverse processes)
longissimus thoracis innervation
Spinal nerves C1-L5 (posterior rami, lateral branches)
Longissimus thoracis action
bilateral: extends the spine
unilateral: bends spine to same side
longissimus cervicis action
bilateral: extends the spine
unilateral: bends spine to same side
spinalis cervicis origin
C5-T2 (spinous processes)
spinalis cervicis insertion
C2-C5 (spinous process)
spinalis cervicis innervation
spinal nerves (posterior rami)
spinalis cervicis action
bilaterally: extends cervical and thoracic spine
spinalis thoracis origin
T10-L3 (spinous process, lateral surface)
spinalis thoracis insertion
T2-T8 (spinous process, lateral surface)
spinalis thoracis innervation
spinal nerves (posterior rami)
spinalis thoracis action
bilateral: extend cervical and thoracic spine
unilateral: bend cervical and thoracic spine to same side
splenius capitis origin
nuchal ligament
C3-C7 (spinous process)
splenius capitis insertion
Lateral superior nuchal line
mastoid process
(of occipital bone)