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Serratus Posterior Superior — Origin?
Nuchal ligament
Spinous processes of C7–T3

Serratus Posterior Superior — Insertion?
Superior borders of ribs 2–5

Serratus Posterior Superior — Action?
Elevates ribs 2–5 (assists inspiration)

Serratus Posterior Superior — Innervation?
Intercostal nerves 2–5

Serratus Posterior Superior — Blood Supply?
Intercostal arteries 2–5

Serratus Posterior Inferior — Origin?
Spinous processes T11–L2


Serratus Posterior Inferior — Insertion?
Inferior borders of ribs 9–12 (near angles)

Serratus Posterior Inferior — Action?
Depresses ribs 9–12

Serratus Posterior Inferior — Innervation?
Intercostal nerves 9–11
Subcostal nerve (T12)

Serratus Posterior Inferior — Blood Supply?
Intercostal arteries 9–11

Spinalis — Origin?
Posterior iliac crest
Posterior surface of sacrum
Sacroiliac ligament
Sacral & inferior lumbar spinous processes
Supraspinous ligament

Spinalis — Insertion?
Spinous processes (upper thoracic → cervical → cranium depending on part)

Spinalis — Action?
Bilateral: Extends head, cervical & thoracic spine
Unilateral: Lateral flexion

Spinalis — Innervation?
Dorsal rami of spinal nerves

Spinalis — Blood Supply?
Lateral sacral arteries

Longissimus — Origin?
Common erector spinae tendon (same as spinalis origin):
Iliac crest
Sacrum
Lumbar spinous processes

Longissimus — Insertion?
Ribs (between tubercles & angles)
Transverse processes (thoracic & cervical)
Mastoid process (capitis portion)

Longissimus — Action?
Bilateral: Extends head, cervical, thoracic & lumbar spine
Unilateral: Lateral flexion

Longissimus — Innervation?
Dorsal rami of spinal nerves

Longissimus — Blood Supply?
Intercostal arteries
Lumbar arteries

Iliocostalis — Origin?
Common erector spinae tendon:
Iliac crest
Sacrum
Lumbar spinous processes

Iliocostalis — Insertion?
Angles of ribs
Cervical transverse processes

Iliocostalis — Action?
Bilateral: Extends vertebral column
Unilateral: Lateral flexion

Iliocostalis — Innervation?
Dorsal rami of spinal nerves

Iliocostalis — Blood Supply?
Intercostal arteries
Lumbar arteries