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Unit 3: The Muscular System Lab 1: Muscles of the Axial Skeleton

Unit 3: The Muscular System Lab 1: Muscles of the Axial Skeleton. Jessica Radke -Snead, RD, MS Bio 241 Anatomy & Physiology. Getting Started. Begin developing your strategy for this unit Organize your material ( ie the study guide, lectures, labs)

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Unit 3: The Muscular System Lab 1: Muscles of the Axial Skeleton

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  1. Unit 3: The Muscular SystemLab 1: Muscles of the Axial Skeleton Jessica Radke-Snead, RD, MS Bio 241 Anatomy & Physiology

  2. Getting Started • Begin developing your strategy for this unit • Organize your material (ie the study guide, lectures, labs) • Develop a system for processing this information • Start with the broad components • Muscles (categorize and group them) • Indicated origins and insertions (use your knowledge of the skeletal system to guide you) • Function (direction of fibers, type of joint) • Continue to build to your knowledge (not all-inclusive) • Histology • Characteristics of the three types of muscle tissue • Physiology of a muscle contraction • Types of muscle contraction • Characteristics of muscle contractions • Muscle metabolism

  3. Making Sense of the Muscles • Description  Location  Function • Use muscle origins and insertions to describe where the muscle is located AND what it does • Origin: attachment of one muscle tendon to the stationary bone • Insertion: attachment of the other muscle tendon to the moving bone • Action: the movement that occurs at the joint due to the muscle contraction

  4. Practice Muscle: Sternocleidomastoid Origin: Sternum and clavicle Insertion: Mastoid process of temporal bone Function: • Bilaterally: flexion of neck, with tilting of head forward and downward (try this!) • Unilaterally: lateral flexion of neck, with rotation of head downward and to the side OPPOSITE of the contracting muscle (try this!)

  5. Muscles: Head and Neck • Movements related to • Facial expression • Eyeball • Mandible, tongue and pharynx • Head and neck • Origin/Insertion requirement • M, T & P: Masseter, genioglossus, stylohyoid, digastric, temporalis • Head and neck: Sternocleidomastoid • Cadaver requirement • Facial expression: Frontalis • Head and neck: Sternocleidomastoid, splenius capitis

  6. Muscles: Head and Neck Masseter O: Maxilla and Zygomatic arch I: Angle and ramus of mandible Fx: and retracts mandible Sternocleidomastoid O: Sternum and clavicle I: Mastoid process Fx: flexion, rotation of neck

  7. Muscles: Head and Neck

  8. Muscles: Head and Neck

  9. Muscles: Head and Neck

  10. Muscles: Trunk • Muscles of • Breathing • Abdominal wall • Back (deep) • Pelvic floor and perineum • Origin/insertion requirement • Breathing: Diaphragm, internal and external intercostals • Abdominal wall: Rectus abdominis, internal and external obliques and transversusabdominis • Cadaver requirement • Breathing: Internal and external intercostals • Abdominal wall: Rectus abdominis, internal and external obliques and transversusabdominis • Back: Erector spinae (spinalis, longissimus, iliocostalis)

  11. Muscles: Trunk External Obliques O: Inferior eight ribs I: Iliac crest Fx: Compresses abs; flexion of trunk Transversusabdominis O: Iliac crest I: Xiphoid process Fx: Compresses abdomen

  12. Muscles: Trunk

  13. Lab Objectives • Exam 2 return/review • Please see me if you are struggling with course material • Lab 1: Be able to identify the location and function of each muscle, and origin/insertion if indicated • Lab 2: Cadavers will be used Wednesday • Preview and review Lab 2 muscles prior to this lab Please let me know if you need assistance—have fun!

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