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BIOL 251 Module 5 Study Guide | Skeletal Muscle & Muscular System Practice Questions | Portage Learning 2026

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Ace your BIOL 251 Module 5 preparation with this focused Portage Learning Anatomy & Physiology I study resource designed to support effective review and strengthen understanding of skeletal muscle tissue and the muscular system. This resource covers essential Module 5 concepts including muscle anatomy, muscle naming principles, facial and trunk muscles, upper and lower limb muscles, muscle actions, major muscle groups, and related anatomical terminology. Designed for students taking BIOL 251 Human Anatomy & Physiology I w/Lab, this resource supports Module 5 coursework, practice-question review, quiz preparation, and exam prep.

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Portage Anatomy and Physiology
Module 5
Final Exam Prep




** Expert-Verified Explanation
** Questions with Verified Answer
** New Edition | 2026-2027 Updated
** 100% Guaranteed Pass
** 100% Correct Answers

, 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

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