Deep Back: Spinotrans group

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Splenius capitus PA (Origin)

Lower ½ lig nuchae, SP C7‐T3(4) & their supraspinous ligs
Splenius capitus DA (Insertion)

Mastoid process & rough surface below lat 1/3 of sup nuchal line
Splenius capitus innervation

Lateral branches of posterior rami of middle cervical spinal nerves
Splenius capitus blood supply

Br. off the external carotid
Splenius capitus actions

Unilaterally: ipsilateral rot. & SB neck

Bilaterally: extends the neck
Splenius cervicus PA (Origin)

SP T3‐6
Splenius cervicus DA (Insertion)

Posterior tubercles of the TP C1‐2(3) (anterior to the attachment of levator scapulae)
Splenius cervicus innervation

Lateral branches of posterior rami of lower cervical spinal nerves
Splenius cervicus blood supply

Br. off the external carotid
Splenius cervicus actions

Unilaterally: ipsilateral rot. & SB neck

Bilaterally: extends the neck