Iliocostalis cervicis PA (Origin)
Ribs 3‐6 at angles

Iliocostalis cervicis DA (Insertion)
C4‐6 TP on post tubercles

Iliocostalis cervicis innervation
Posterior rami of lower cervical spinal nerves

Iliocostalis cervicis blood supply
Post. branches of post intercostal arteries

Iliocostalis cervicis actions
Unilaterally: ipsilateral. SB the spine 
Bilaterally: extends the spine

Iliocostalis thoracis PA (Origin)
Lower 6 ribs at the angles

Iliocostalis thoracis DA (Insertion)
Upper 6 ribs at the angles, posterior portion of the C7 TP

Iliocostalis thoracis innervation
Posterior rami of thoracic spinal nerves

Iliocostalis thoracis blood supply
Post. branches of post intercostal arteries

Iliocostalis thoracis actions
Unilaterally: ipsilateral. SB the spine 
Bilaterally: extends the spine

Iliocostalis lumborum PA (Origin)
common tendon (median sacral crest, SP T11, 12 and L1‐5 and their supraspinous ligaments and medial aspect of the posterior iliac crest

Iliocostalis lumborum DA (Insertion)
lower 6‐7 ribs at the angles

Iliocostalis lumborum innervation
Posterior rami of lumbar spinal nerves

Iliocostalis lumborum blood supply
Post. branches of post intercostal arteries

Iliocostalis lumborum actions
Unilaterally: ipsilateral. SB the spine
Bilaterally: extends the spine

Longissimus capitus PA (Origin)
TP’s of T1‐4(5) & articular processes C(4)5‐7

Longissimus capitus DA (Insertion)
mastoid process at post margin

Longissimus capitus innervation
Posterior rami of lower cervical spinal nerves

Longissimus capitus blood supply
Muscular branches of the occipital artery, Post. branches of post intercostal a.

Longissimus capitus actions
Unilaterally: ipsilateral. Rot of the head
Bilaterally: extends the head

Longissimus cervicis PA (Origin)
TP’s of T1‐4(5)

Longissimus cervicis DA (Insertion)
TP’s of C2‐6 at post tubercles

Longissimus cervicis innervation
Posterior rami of cervical and thoracic spinal nerves

Longissimus cervicis blood supply
Post. branches of post intercostal arteries

Longissimus cervicis actions
Unilaterally: ipsilateral. SB of the head 
Bilaterally: extends the spine

Longissimus thoracis PA (Origin)
In the lumbar region via a common tendon, (post. aspect of the lumbar TP’s, middle layer of the thoracolumbar fascia)

Longissimus thoracis DA (Insertion)
Tips of T1‐12 TP’s & lower 9‐10 ribs between the tubercles & angles

Longissimus thoracis innervation
Posterior rami of thoracic and lumbar spinal nerves

Longissimus thoracis blood supply
Post. branches of post intercostal arteries

Longissimus thoracis actions
Unilaterally: ipsilateral SB of the head
Bilaterally: extends the spine

Spinalis capitis PA (Origin)
Blends with semispinalis capitis

Spinalis capitis DA (Insertion)
Blends with semispinalis capitis

Spinalis capitis innervation
Posterior rami of lower cervical spinal nerves

Spinalis capitis blood supply
Post. branches of post intercostal arteries

Spinalis capitis actions
Extends the spine

Spinalis cervicis PA (Origin)
Lower lig nuchae, SP C7

Spinalis cervicis DA (Insertion)
SP C2

Spinalis cervicis innervation
Posterior rami of cerv. & thoracic spinal n

Spinalis cervicis blood supply
Post. branches of post intercostal a.

Spinalis cervicis actions
Extends the spine

Spinalis thoracis PA (Origin)
SP’s of T11‐L2

Spinalis thoracis DA (Insertion)
SP’s of T1‐4

Spinalis thoracis innervation
Posterior rami of thoracic and lumbar spinal nerves

Spinalis thoracis blood supply
Post. branches of post intercostal arteries

Spinalis thoracis actions
Extends the spine