Innervation of splenius cervicis?

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Multiple Choice

Innervation of splenius cervicis?

Explanation:
Splenius cervicis is part of the intrinsic (epaxial) back muscles that act on the neck, so it receives innervation from the dorsal rami of spinal nerves. The dorsal rami carry motor to the deep posterior neck muscles and provide sensation to the back of the neck, aligning with where splenius cervicis lies and how it functions. Specifically, the cervical dorsal rami at levels C5 through C7 supply this muscle, matching its segmental origin and insertion. The ventral (anterior) rami supply the muscles of the front and sides of the neck and trunk, not these deep posterior muscles, and thoracic dorsal rami would not innervate a cervical muscle. This is why dorsal rami of C5-C7 are the correct innervation.

Splenius cervicis is part of the intrinsic (epaxial) back muscles that act on the neck, so it receives innervation from the dorsal rami of spinal nerves. The dorsal rami carry motor to the deep posterior neck muscles and provide sensation to the back of the neck, aligning with where splenius cervicis lies and how it functions. Specifically, the cervical dorsal rami at levels C5 through C7 supply this muscle, matching its segmental origin and insertion. The ventral (anterior) rami supply the muscles of the front and sides of the neck and trunk, not these deep posterior muscles, and thoracic dorsal rami would not innervate a cervical muscle. This is why dorsal rami of C5-C7 are the correct innervation.

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