Intrinsic Back Muscle POINA's Flashcards
Origin of Splenius (capitis and cervicis)
Nuchal Ligament
SP of C7-T6
Insertion of Splenius Capitis
Mastoid process
Superior nuchal line
Fibers run superolaterally!
Insertion of Splenius Cervicis
TP of C1-C4
Same as levator! Travel buddies!
Nerve Innervation of Splenius (both)
Posterior/Dorsal Rami of Spinal Nerves
Muscle Action of Splenius (both)
Bilateral: head/neck EXTENSION
Unilateral:
IPSILATERAL head ROTATION
LATERAL neck FLEXION
Purposeful Activity of Splenius (both)
Driving, communication (shaking/nodding head)
Purposeful Activity of Iliocostalis
Maintaining upright posture for ADL’s
Origin of Iliocostalis
Thoracolumbar fascia / Common tendon which attaches to:
-SP of Lumbar spine and T11-12
-Iliac crest
-Posterior surface of sacram
SIP!
Insertion of Iliocostalis
-Cervical TP
-Lower rib angles
Include new last name!
Nerve innervation of Iliocostalis
Dorsal/Posterior Rami of Spinal Nerves
Action of Iliocostalis
Bilateral: Vertebral column extension
Unilateral: IPSILATERAL vertebral column LATERAL FLEXION
Purposeful Activity of Longissimus
Upright posture for ADL’s
Origin of Longissimus
Thoracolumbar / Common Tendon
-SP of T11-12 and lumbar spine
-Iliac crest
-Posterior surface of sacrum
Insertion of Longissimus
-B/w rib tubercles and Thoracic TP
-Mastoid Process
Include new last name!
Nerve innervation of Longissimus
Dorsal/Posterior Rami of Spinal Nerves
Action of Longissimus
Bilateral: Vertebral column EXTENSION
Unilateral: IPSILATERAL vertebral column LATERAL FLEXION
Purposeful Activity of Spinalis
Maintaining upright posture for ADL’s
Origin of Spinalis
Thoracolumbar fascia / common tendon
-SP of T11-T12
-Iliac crest
-Posterior surface of sacrum
Insertion of Spinalis
Upper thoracic and cervical SP
Include new last name!
Nerve innervation of Spinalis
Dorsal/posterior Rami of Spinal Nerves
Action of Spinalis
Bilateral: EXTENSION of vertebral column
Unilateral: IPSILATERAL vertebral column LATERAL FLEXION
Purposeful activity of Rotatores
Deep postural stability
Origin of Rotatores
TP of the vertebrae
Most prominent in THORACIC spine!
Insertion of Rotatores
SP of vertebrae through C2
Two types! Spans 1-2 segments
-Brevus = 1
-Longus = 2
Nerve innervation of Rotatores
Dorsal/posterior rami of spinal nerves
Action of Rotatores
Bilateral: Vertebral column LOCAL extension.
Unilateral: CONTRALATERAL ROTATION of vertebral column
May also act as proprioception
Purposeful activity of multifidus
Deep postural stability
Origin of multifidus
S - Sacro Iliac (SI) Ligaments
T - TP of T1-T3
A - aponeurosis of erector spinae
A - Articular processes of C4-C7
M - Mammillary processes of lumbar vertebrae
P - PSIS
P - Posterior Sacrum
Remember Stamp!
Insertion of multifidus
Entire length of SP’s
SPANS 2-4 SEGMENTS
Fibers run superomedially, and are MOST PROMINENT IN LUMBAR REGION
Nerve Innervation of Multifidus
Dorsal/Posterior Rami of Spinal Nerves
Action of Multifidus
Bilateral:
-Vertebral Column LOCAL EXTENSION
-STABILIZES vertebrae during local movement
Unilateral:
-CONTRALATERAL ROTATION of vertebral column
Purposeful activity of Semispinalis
Looking overhead, using a computer
Origin of Semispinalis
-TP of C4-T12
Insertion of Semispinalis
Fibers run superomedially to occipital bone
SP of thoracic and cervical spine
SPANS 4-6 SEGMENTS
MOST PROMINENT IN CERVICAL SPINE
DONT FORGET CAPITIS/CERVICIS/THORACIS
Nerve innervation of Semispinalis
CERVICAL Dorsal/Posterior Rami of CERVICAL Spinal Nerves
Action of Semispinalis
Bilateral:
-Head/neck/thoracic spine EXTENSION
Unilateral:
-Head/neck/thoracic spine CONTRALATERAL ROTATION
