BIO 210 Muscles Lab FA2022.docx

HUMAN MUSCLES LAB Obtain a muscle figure. Using your PowerPoint and Visible Body Atlas for reference, identify each of the structures in the below Checklists and place a labeled flag on the structure. Show your instructor your labeled models or pictures of your labeled models. When you have committed the structures to memory, place a checkmark in the box beside them. ( 30 points ) As you identify them, answer the questions that follow them. ( 2 points each ) MUSCLES OF FACIAL EXPRESSION CHECKLIST Muscle name √ Muscle name √ Orbicularis Oculi √ Orbicularis Oris √ Zygomaticus Major √ Buccinator √ 1. What part of the body might “oculi” refer to? Eyes 2. Is there another word you learned in Lab 3 on the Microscope that is more familiar to you, but means the same? Oculars 3. What part of the body might “oris” refer to? Mouth 4. Is there another word you can think of that sounds the same but is more familiar to you? Oral 1

5. Why would the Zygomaticus Major have the word “major” after it? I think it has the word major after it because it is the main muscle that allows laughing. While other muscles also help, the zygomaticus major helps the most. 6. What is the buccal cavity? Cheek 7. How does question #6 relate to the 4 th muscle you were asked to identify? The muscle in the cheek allows for blowing and whistling MUSCLES OF MASTICATION CHECKLIST Muscle name √ Muscle name √ Masseter √ Temporalis √ 8. What does mastication mean? The act of chewing 9. Why is the temporalis named such? It is on the temporal bone MUSCLES OF THE NECK CHECKLIST Muscle name √ Sternocleidomastoid √ 10. Based on the three parts of the name of this muscle, can you determine which three bones OR bone markings, it attaches to? Sternum, mastoid process, and clavicle 11. Turn your head to the side. Can you palpate this muscle? What specific head motions might it allow for? Flexion, extension, and rotation 2

MUSCLES OF THE THORAX (RESPIRATION) CHECKLIST Muscle name √ Muscle name √ Muscle name √ External Intercostals √ Internal Intercostals √ Diaphragm √ 12. What does the word “intercostal” mean? Between the ribs 13. Which of the two intercostal muscles would be “deep” compared to the other? The internal intercostals would be deep compared to the external intercostal muscles. 14. Skeletal muscles normally attach to bones. What is significant about the location of the diaphragm? It enlarges the thorax MUSCLES OF THE ABDOMEN CHECKLIST Muscle name √ Muscle name √ External Oblique √ Transversus Abdominis √ Internal Oblique √ Rectus Abdominis √ 3

15. Why might we need four muscles in the abdominal area, relatively in the same location? There are multiple layer of muscles all going in different directions for strength and protection 16. List these muscles from superficial to deep. External oblique, internal oblique, transversus abdominis, and rectus abdominis 17. What do you notice about the direction of the muscle fibers in these four muscles? How do they differ from one another? They are all going in separate directions. To the side, diagonally, and up and down MUSCLES ACTING ON THE SHOULDER GIRDLE-ANTERIOR CHECKLIST Muscle name √ Serratus Anterior √ MUSCLES ACTING ON THE SHOULDER GIRDLE-POSTERIOR CHECKLIST Muscle name √ Trapezius √ 18. Look up the word “serrated”. How does it seem to relate to the Serratus Anterior? Serrated means having or denoting a jagged edge. 19. What motions might muscles that act on the shoulder girdle perform? Raises and lowers shoulders 4

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