Intrinsic Back & Suboccipitals Flashcards
OINAs
Splenius Capitis and Cervicis Action
unilaterally: lateral flexion and ipsilateral rotation of head
bilaterally: extension of head and neck
Splenius Capitis and Cervicis PA
nuchal ligament and SP of C7-T6
Splenius Capitis and Cervicis DA
capitis: mastoid process and superior nuchal line
cervicis: TP of C1-C4
Splenius Capitis and Cervicis Innervation
dorsal rami of spinal nerves
Erector Spinae Action
unilaterally: lateral flexion of vertebral column to ipsilateral side
bilaterally: extension of vertebral column
Erector Spinae PA
thoracolumbar fascia (attaches to posterior sacrum), iliac crest, and SP of T11-L5
Erector Spinae DA
iliocostalis: lower rib angles and cervical TP
longissimus: b/w rib tubercles and angles to thoracic TP
spinalis: upper thoracic SP and cranium
Erector Spinae Innervation
dorsal rami of spinal nerves
Rotatores Action
unilaterally: contralateral rotation of vertebral column
bilaterally: local extension of vertebral column
Rotatores IA
TP of vertebrae (best at thoracic)
Rotatores SA
SP of C2-L5 (span 1-2 vertebrae)
Rotatores Innervation
dorsal rami of spinal nerves
Multifidus Action
unilaterally: contralateral rotation of vertebral column
bilaterally: extension of vertebral column
stabilizes vertebrae during local movements
Multifidus IA
posterior sacrum, PSIS, aponeurosis of erector spinae, SI ligaments, mamillary processes of lumbar vertebrae, TP of T1-T3, articular processes of C4-C7
Multifidus SA
SP of all vertebrae (fibers pass obliquely superomedially 2-4 segments superior to IA)
Multifidus Innervation
dorsal rami of spinal nerves
Semispinalis Action
extension and contralateral rotation of head, neck, and thoracic spine
Semispinalis IA
TP of C4-T12
Semispinalis SA
occipital bone, SP in cervical and thoracic regions (fibers run superomedially, spanning 4-6 segments)
Semispinalis Innervation
dorsal rami of spinal cervical nerves
Suboccipitals Action
extension of head (rectus capitis posterior major/minor, obliquus capitis superior)
ipsilateral rotation of head (rectus capitis posterior major/minor, obliques capitis inferior)
ipsilateral lateral flexion of head (obliquus capitis superior)
Suboccipitals Innervation
suboccipital nerve (dorsal ramus C1)
Rectus Capitis Posterior Major Attachment
O: SP of C2 (axis)
I: lateral inferior nuchal line
Rectus Capitis Posterior Minor Attachment
O: posterior tubercle of C1 (atlas)
I: medial inferior nuchal line
Obliquus Capitis Inferior Attachment
O: SP of C2 (axis)
I: TP of C1 (atlas)
Obliquus Capitis Superior Attachment
O: TP of C1 (atlas)
I: occipital bone b/w superior and inferior nuchal lines
