superficial layer of intrinsic back muscles

Question 1

splenius origin

Answer 1

ligamentum nuchae
spinous process of c7-T6

Question 2

splenius insertion

Answer 2

capitis: mastoid process and superior nuchal line

cervicis: posterior tubercles of transverse process of C1-C3 vertebrae

Question 3

splenius action

Answer 3

bilateral contraction: extend head and neck

Unilateral contraction: laterally flex the neck and head, rotate the head ipsilaterally

Question 4

splenius nerve

Answer 4

dorsal primary rami of spinal nerves C2-C6

Question 5

spenius artery

Answer 5

occipital artery
deep cervical artery