Neurolemmocyte On Skeletal Muscle Model

1. Review a textbook section on skeletal muscle tissue.

2. Reexamine the microscopic structure of skeletal muscle by observing a prepared microscope slide of this tissue. Use figure 18.1 of skeletal muscle tissue to locate the following features:

skeletal muscle fiber (cell)

nuclei striations (alternating light and dark)

3. Review a textbook section on structure of a skeletal muscle.

4. Study figures 18.2 and 18.3.

5. Examine the torso and locate examples of fascia, tendons, and aponeuroses. Locate examples of tendons in your own body.

6. Complete Part A of Laboratory Report 18.

DEMONSTRATION

E xamine the fresh round beefsteak. It represents a cross section through the beef thigh muscles. Note the white lines of connective tissue that separate the individual skeletal muscles. Also note how the connective tissue extends into the structure of a muscle and separates it into small compartments of muscle tissue. Locate the epimysium and the perimysium of the deep fascia.

7. Examine the model of the skeletal muscle fiber and locate the following:

sarcolemma sarcoplasm myofibril myosin filament actin filament sarcomere A band I band

Anatomy 141

Figure 18.2 Skeletal muscle structure from the gross anatomy to the microscopic arrangement. Note the distribution pattern of the epimysium, perimysium, and endomysium.

Myofibrils

Tendon

Filaments

Figure 18.2 Skeletal muscle structure from the gross anatomy to the microscopic arrangement. Note the distribution pattern of the epimysium, perimysium, and endomysium.

Myofibrils

Tendon

Filaments

Fascicle Neuron Model

Fascicle

Axon of motor neuron

Blood vessel

Sarcoplasmic Nucleus reticulum

Fascicle

Axon of motor neuron

Blood vessel

Sarcoplasmic Nucleus reticulum

Figure 18.3 Structures of a skeletal muscle fiber.

Nucleus

Myofibrils

Cisternae of sarcoplasmic reticulum

Sarcoplasmic reticulum

Transverse tubules (sarcolemmal invagination)

Openings into transverse tubules

Figure 18.3 Structures of a skeletal muscle fiber.

Myofibrils

Cisternae of sarcoplasmic reticulum

Nucleus

Label Skeletal Muscle Fiber
Nucleus

Figure 18.4 Label the major features of the upper limb.

H zone M line Z line sarcoplasmic reticulum cisternae transverse tubules

Prime Movers Anatomy

8. Complete Part B of the laboratory report.

9. Review a textbook section on skeletal muscle actions.

10. Provide labels for figure 18.4.

11. Locate the biceps brachii and its origins and insertions in the torso and in your own body.

12. Make various movements with your upper limb at the shoulder and elbow. For each movement, determine the location of the muscles functioning as prime movers and as antagonists. (Remember, when a prime mover contracts, its antagonist must relax.)

13. Complete Part C of the laboratory report.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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