Dajanet Smith lab manual_muscles abdomen thorax pdf

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Barstow Community College *

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Course

40901

Subject

Anatomy

Date

Oct 30, 2023

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pdf

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Uploaded by dajanets

2 PRE-LAB EXERCISES Before coming to lab, get familiar with a few muscle groups weʼll be exploring during lab. Open Visible Body Suite. Search for and select the Muscular System View “Inhalation” and find the following muscles. When you select a muscle, you can use the book icon in the content box to read the muscleʼs definition . 1. External intercostals 2. Pectoralis minor Define the following terms: 1. Flexion 2. Extension 3. Elevation 4. Depression Right external intercostal muscles Right pectoralis minor muscle

3 IN-LAB EXERCISES Use the following modules to guide your exploration of the thoracic and abdominal regions of the muscular system. As you explore the modules, locate the muscles on any charts, models, or specimen available. These muscles are located on the thorax, abdomen, and back, and serve to protect the cavities they enclose as well as provide movement. These muscle groups will have different jobs depending on where they are located. Those muscles on the chest wall around the ribs play roles in changing the size of the thoracic cavity for inspirations and expirations. Muscles located along the spine are involved in movement of the back, and muscles lining the abdomen help to protect the organs underneath while also allowing for movement of the trunk. The long names of some of these muscles can be daunting, but they are often very descriptive. You can find origins, insertions, actions, and/or locations of these muscles simply in the names. When reviewing the action of a muscle, it will be helpful to think about where the muscle is located and where the insertion is. Muscle physiology requires that a muscle will “pull” instead of “push” during contraction, and the insertion is the part that will move. Imagine that the muscle is pulling on the bone or tissue it is attached to at the insertion. Access 3D views and animated muscle actions in Visible Body Suite, which will be especially helpful to visualize muscle actions. When you select a structure in Visible Body Suite, youʼll see options to read the definition and hear the pronunciation in the content box. When you select a muscle, be sure to select the blue pin icon in the content box. This will give you the option to view origins and insertions as visible pins on the muscle (select Attachments), view the blood supply, and/or the nerve supply. In the modules below, identify the following: • Muscle location • Origin(s) and insertion(s) • Muscle action • Nerve supply

4 A. Inspiratory Muscles Search for and open the Muscular System View “Inhalation” and the Muscle Action “Ribs elevation.” Right serratus anterior muscles Right pectoralis minor muscle Right scalene muscles Diaphragm Right external intercostal muscles Right serratus posterior superior muscles

5 These muscles are responsible for inspiration during pulmonary ventilation. Although the diaphragm and, to a lesser extent, the external intercostals are primarily responsible for inspiration, additional accessory respiratory muscles can contract to assist in a more forceful inspiration. Anatomically, the diaphragm marks the division between the thoracic and abdominal cavities. Observe the openings in the diaphragm that allow the passage of the esophagus and major blood vessels. Insertion Inspiratory Muscles Origin Muscle Diaphragm External intercostal Pectoralis minor Serratus anterior Serratus posterior superior Scalenes Action Innervation

6 B. Expiratory Muscles Search for and open the Muscular System View “Exhalation” and the Muscle Action “Ribs depression.” Right serratus posterior inferior muscles Right transversus thoracis muscles Left transversus abdominis muscle Left internal oblique muscle Left rectus abdominis muscle Left internal intercostal muscles

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