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D I S S E C T I O N
EXERCISE
Dissection and Identification of Fetal Pig Muscles
Time Allotment: Muscle dissection; 4 hours.
Multimedia Resources: See Appendix D for a list of multimedia offerings.
The Anatomy of the Fetal Pig (CBS, 62 minutes, VHS, DVD)
Fetal Pig (DryLab Plus) (ED, CD-ROM)
The Fetal Pig: A Technological Dissection (ED, CD-ROM)
Solution:
Carboglycerine solution
30 grams fungicide (Benomyl, Sigma)
250 milliliters glycerine
1 liter water
Mix together and store in a closed container.
Advance Preparation
335
Comments and Pitfalls
Answers to Questions
Activity 3: Dissecting Trunk and Neck Muscles
Superficial Muscles of the Posterior Trunk and Neck (pp. 711–712)
Activity 4: Dissecting Forelimb Muscles
Upper Forelimb Muscles (p. 713)
Activity 5: Dissecting Hindlimb Muscles
Muscles of the Posterolateral Hindlimb (pp. 713–716)
Muscles of the Anteromedial Hindlimb (pp. 716–717)
Dissection Review
Many human muscles are modified from those of the pig (or any quadruped) as a result of the requirements of an upright posture. The following questions refer to these differences.
1. How does the human trapezius muscle differ from the pig’s? humans have one large single trapezius muscle, but the pig has three separate muscles the
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clavotrapezius, the acromiotrzpezius, and the spinotrapezius
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2. How does the deltoid differ? the deltoid muscle of a pig is a thin band in humans it is thick and fleshy.
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3. How does the extent and orientation of the human sartorious muscle differ from its relative position in the pig? the human satorius is a thin straplike muscle running obliquely across the anterior thigh. the pigs
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is flat and covers most of the anterolateral thigh.
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4. Explain the differences in terms of differences in function. the human sartorius acts to adduct the thigh and flex the hip. upon contrsction, the human
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sartorius produces flexion at the knee and lateral rotation of the hip
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5. The human rectus abdominis is definitely divided by four transverse tendons (tendinous intersections). These tendons are absent or difficult to identify in the pig. How do these tendons affect the human upright posture? these tendons support the abdominal muscular wall so that the viscera are not allowed to
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become pendulous in the upright posture of humans
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336
Dissection Exercise 1
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