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

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Presentation on theme: "Unit 3: The Muscular System Lab 1: Muscles of the Axial Skeleton Jessica Radke-Snead, RD, MS Bio 241 Anatomy & Physiology."— Presentation transcript:

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: 1.Bilaterally: flexion of neck, with tilting of head forward and downward (try this!) 2.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

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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 transversus abdominis Cadaver requirement – Breathing: Internal and external intercostals – Abdominal wall: Rectus abdominis, internal and external obliques and transversus abdominis – 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 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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