Spine OIAI - Kinesiology 2

Sternocleidomastoid Origin

Mastoid process of cranium

Sternocleidomastoid Insertion

Sternum and Clavicle

Sternocleidomastoid Action

Bilateral:  cervical flexion

Unilateral:  lateral flexion and contralateral rotation

Sternocleidomastoid Innervation

Cranial nn

Scalenes Origin

C2-7

Scalenes Insertion

1^st and 2^nd ribs

Scalenes Action

Cervical flexion and side bend

Scalenes Innervation

Cervical spinal nn

Splenius Capitis Origin

Mastoid process

Splenius Capitis Insertion

C7-T3 and nuchal ligament

Splenius Capitis Action

Bilateral:  neck extension

Unilateral:  Ipsilateral rotation and side bend

Splenius Capitis Innervation

Posterior rami of C2-C3 nn

Splenius Cervicis Origin

C1-3 Transverse processes

Splenius Cervicis Insertion

T3-6 transverse processes

Splenius Cervicis Action

Bilateral:  neck extension

Unilateral:  Ipsilateral rotation and side bend

Splenius Cervicis Innervation

Dorsal rami of C5 to C8 nn

Rectus abdominis Origin

Xiphoid process and cartilage of ribs 5-7

Rectus abdominis Insertion

Pubis

Rectus abdominis Action

Trunk flexion and posterior pelvic tilt

Rectus abdominis Innervation

Thoracoabdominal nn

External obliques Origin

Iliac crest and linea alba

External obliques Insertion

Lateral ribs 4-12

External obliques Action

Bilateral:  Flex trunk; PPT

Unilateral:  Lateral flexion and contralateral rotation

External obliques Innervation

Thoracic spinal nn T7-T12

Internal obliques Origin

Ribs 9-12 & linea alba  

Internal obliques Insertion

Iliac crest

Internal obliques Action

Bilateral:  Flex trunk; PPT

Unilateral:  Lateral flexion and ipsilateral rotation

Internal obliques Innervation

Thoracoabdominal nn (T7-T11), the subcostal nerve (T12)

Transverse Abdominis (TrA) Origin

Linea alba

Transverse Abdominis (TrA) Insertion

Iliac crest, T-L Fascia, Cartilage of ribs 6-12

Transverse Abdominis (TrA) Action

Increase tension in T-L fascia

Transverse Abdominis (TrA) Innervation

Lower 5 intercostal nn (T7-T11), subcostal nn (T12)

Iliopsoas Origin

Transverse processes of T12-L5 (Psoas major), and Iliac fossa (Iliacus)

Iliopsoas Insertion

Lesser trochanter of femur

Iliopsoas Action

Hip flexion, trunk flexion, anterior pelvic tilt

Iliopsoas Innervation

Lumbar spinal nn, femoral nn

Quadratus Lumborum Origin

L1-4 transverse processes and 12^th rib

Quadratus Lumborum Insertion

Iliac crest

Quadratus Lumborum Action

Bilateral:  lumbar extension

Unilateral:  lateral flexion

Quadratus Lumborum Innervation

Subcostal nn

Transversospinals: Semispinalis, Multifidus, and rotators Origin

Spinous processes

Transversospinals: Semispinalis, Multifidus, and rotators Insertion

Transverse processes

Transversospinals: Semispinalis, Multifidus, and rotators Action

Bilateral:  lumbar extension

Unilateral:  contralateral rotation

Transversospinals: Semispinalis, Multifidus, and rotators Innervation

Posterior rami of the spinal nn

Short (deep) segmental group: Intertransversarius and interspinalis Origin

Transverse and spinous processes

Short (deep) segmental group: Intertransversarius and interspinalis Insertion

Transverse and spinous processes

Short (deep) segmental group: Intertransversarius and interspinalis Action

Lateral flexion (intertransversarius)

Extension (interspinalis)

Spinal stabilization

Short (deep) segmental group: Intertransversarius and interspinalis Innervation

Dorsal rami spinal nn

Erector spinae Origin

Common L-S tendon

Erector spinae Insertion

Ribs, transverse processes, and spinous processes

Erector spinae Action

Extend and stabilize the spine

Erector spinae Innervation

Lateral branches of the posterior rami