has muscle insertion has muscle insertion Homo sapiens skull spinalis muscle spinalis capitis muscle Origin: spines of upper thoracic and lower cervical vertebrae; insertion: occipital bone; innervation: spinal nerves; action, extends head. SCTID:244865003 FMA:22775 musculus spinalis capitis BTO:0002622 UBERON:0011014 spinalis capitis spinal muscle of head