Spinal Nerves

Authors

Affiliations

Nathaniel Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

Innervation

Somatic Innervations

Motor Innervation

Spinal nn. Muscle Innervations
Muscle	Origin	Insertion	Innervation	Action
Psoas Minor	T12, L1 vertebrae (lateral aspect) and IVD1 [T12, L1 vertebrae (lateral aspect) and IVD](/The Archive/Anatomy/Skeletal Muscles/Lower limb muscles/Iliopsoas muscles/psoas_minor_muscle.qmd#origin) [@gilroyAtlasAnatomy2020]	Pectineal Line1 Iliopubic ramus1 Iliac fascia1 Inguinal ligament1 [Pectineal Line](/The Archive/Anatomy/Skeletal Muscles/Lower limb muscles/Iliopsoas muscles/psoas_minor_muscle.qmd#insertion) [@gilroyAtlasAnatomy2020] [Iliopubic ramus](/The Archive/Anatomy/Skeletal Muscles/Lower limb muscles/Iliopsoas muscles/psoas_minor_muscle.qmd#insertion) [@gilroyAtlasAnatomy2020] [Iliac fascia](/The Archive/Anatomy/Skeletal Muscles/Lower limb muscles/Iliopsoas muscles/psoas_minor_muscle.qmd#insertion) [@gilroyAtlasAnatomy2020] [Inguinal ligament](/The Archive/Anatomy/Skeletal Muscles/Lower limb muscles/Iliopsoas muscles/psoas_minor_muscle.qmd#insertion) [@gilroyAtlasAnatomy2020]	Spinal nn.1 L1 - L31 [Spinal nn.](/The Archive/Anatomy/Skeletal Muscles/Lower limb muscles/Iliopsoas muscles/psoas_minor_muscle.qmd#nerve) [@gilroyAtlasAnatomy2020] [L1](/The Archive/Anatomy/Skeletal Muscles/Lower limb muscles/Iliopsoas muscles/psoas_minor_muscle.qmd#nerve) - [L3](/The Archive/Anatomy/Skeletal Muscles/Lower limb muscles/Iliopsoas muscles/psoas_minor_muscle.qmd#nerve) [@gilroyAtlasAnatomy2020]	Trunk [Weak flexion](/The Archive/Anatomy/Skeletal Muscles/Lower limb muscles/Iliopsoas muscles/psoas_minor_muscle.qmd#action) [@gilroyAtlasAnatomy2020]
Splenius capitis	Nuchal lig.1 C7-T4 SP1 Nuchal lig. [@gilroyAtlasAnatomy2020] C7-T4 SP [@gilroyAtlasAnatomy2020]	Lateral third of nuchal line1 Mastoid process1 Lateral third of nuchal line [@gilroyAtlasAnatomy2020] Mastoid process [@gilroyAtlasAnatomy2020]	Spinal nn.1 Posterior rami (lateral br.)1 C1 - C61 Spinal nn. [@gilroyAtlasAnatomy2020] Posterior rami (lateral br.) [@gilroyAtlasAnatomy2020] C1 - C6 [@gilroyAtlasAnatomy2020]	Bilateral Head and neck extension [@gilroyAtlasAnatomy2020] Unilateral I/L sidebend [@gilroyAtlasAnatomy2020] I/L rotation [@gilroyAtlasAnatomy2020]
Splenius cervicis	T3-T7 SP1 T3-T7 SP [@gilroyAtlasAnatomy2020]	C1-C4 SP1 C1-C4 SP [@gilroyAtlasAnatomy2020]	Spinal nn.1 Posterior rami (lateral br.)1 C1 - C61 Spinal nn. [@gilroyAtlasAnatomy2020] Posterior rami (lateral br.) [@gilroyAtlasAnatomy2020] C1 - C6 [@gilroyAtlasAnatomy2020]	Bilateral Head and neck extension [@gilroyAtlasAnatomy2020] Unilateral I/L sidebend [@gilroyAtlasAnatomy2020] I/L rotation [@gilroyAtlasAnatomy2020]

Anterior rami:

• Serratus Posterior superior (T2-T5 ant rami)¹
• Serratus posterior inferior (T9-T12 ant rami)¹

Posterior Rami, lateral branches:

• Splenius Capitis (C1-C6)¹
• Splenius cervicis (C1-C6)¹
• Iliocostalis (C8-L1: Posterior rami, lateral br)
  • Iliocostalis Cervicis
  • Iliocostalis Thoracis
  • Iliocostalis lumborum
• Longissimus (C1-L5: posterior rami, lateral br)
  • Longissimus Capitis
  • Longissimus Cervicis
  • Longissimus Thoracis
• Spinalis
  • Spinalis Cervicis
  • Spinalis Thoracis

References

1.

Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.