Module 5
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, Orbicularis oculi Action: eye closure Innervation: Facial nerve (CN VII)
Zygomaticus major/minor Action: pull corners of lips upward Innervation: Facial nerve (CN VII)
Frontalis (occipitofrontailis) Action: raise eyebrows Innervation: Facial nerve (CN VII)
Buccinator Action: compress cheeks Innervation: Facial nerve (CN VII)
Masseter Action: jaw closure Innervation: Trigeminal nerve (CN V, mandibular branch)
Semispinalis Capitis Origin: Articular processes of inferior cervical & transverse process of superior
thoracic vertebrae Insertion: Occipital bone Action: Bilateral extend head
Unilateral laterally flexes neck to same side Innervation: Spinal nerves
Sternocleidomastoid Origin: Sternal end of clavicle and manubrium Insertion: Mastoid region of skull
Action: Bilateral: Neck flexion Unilateral: Turns face to opposite side Innervation:
Accessory nerve (CN XI)
Splenius Capitis Origin: Spinous process/ligaments of inferior cervical vertebraeInsertion: Mastoid
process, occipital bones of skullAction:Bilateral extend headUnilateral laterally
flexes neck to same side
Innervation: Cervical spinal nerves