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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 System Lab 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 Origin/insertion requirement
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 transversus abdominis Cadaver requirement Breathing: Internal and external intercostals Back: Erector spinae (spinalis, longissimus, iliocostalis)

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

12 Muscles: Trunk

13 Please let me know if you need assistance—have fun!
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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