Cervical Spine Flexors Flashcards
Innervation of longus colli
C2-C6 spinal nerves (ventral rami)
Action of longus colli
Cervical flexion
Cervical rotation to opposite side
May laterally flex
Action of scalenus Anterior
cervical flexion
elevates first rib in inspiration
cervical rotation to opposite side
cervical lateral bending to same side
Innervation of scalenus anterior
C4-C6 spinal nerve (ventral rami)
Action of scalenus medius
Cervical flexion
Cervical lateral bending to same side
Elevates first rib in inspiration
Cervical rotation to opposite side
Innervation of scalenus medius
C3-C8 spinal nerves (ventral rami)
Action of Scalenus posterior
Cervical lateral bending to same side
Elevates second rib in inspiration
Cervical rotation to opposite side
Innervation of scalenus posterior
C6-C8 spinal nerves (ventral rami)
Action of sternocleidomastoid
Cervical flexion Capital extension Cervical lateral bending to same side Rotation of head to opposite side Raises sternum in forced inspiration
Innervation of sternocleidomastoid
Spinal accessory nerve
C2-C3 cervical nerve (ventral rami)
Action of sternothyroid
Cervical flexion
Draws larynx down
Depression of hyoid, mandible, and tongue (after elevation)
Innervation of sternothyroid
C1-C3 cervical nerves
Action of thyrohoid
Cervical flexion
Draws hyoid downward
Elevates larynx and thyroid cartilage
Innervation of thyrohyoid
Hypoglossal (XII); C1 spinal nerve
Action of sternohyoid
Cervical flexion
Depression of hyoid
