Skeletal Muscle Dissection

1. The purpose of a skeletal muscle dissection is to separate the individual muscles from any surrounding tissues and thus expose the muscles for observation. To do a muscle dissection, follow these steps:

a. Use the appropriate figure as a guide and locate the muscle to be dissected in the specimen.

b. Use a blunt probe to separate the muscle from the surrounding connective tissue along its natural borders. The muscle should separate

Figure 24.3 The dotted lines indicate the shallow skin i

Figure 24.3 The dotted lines indicate the shallow skin i

Concise Fetal Pig Dissection Chart

smoothly. If the border appears ragged, you probably have torn the muscle fibers. Because the fetal pig's muscles are incompletely developed, they are easily damaged and hard to distinguish, especially in small to medium sizes.

2. If it is necessary to transect a superficial muscle to observe a deeper one, use scissors to transect the muscle about halfway between its origin and insertion. Then, reflect the cut ends, leaving their attachments intact.

3. The following procedures will instruct you to dissect some of the larger and more easily identified muscles of the fetal pig. In each case, the procedure will include the names of the muscles to be dissected, figures illustrating their locations, and tables listing the origins, insertions, and actions of the muscles. Compare the muscle origins and insertions to the fetal pig skeleton (fig. 24.4). (More detailed dissection instructions can be obtained by consulting an additional guide or atlas for fetal pig dissection.)

on the male and female fetal pig to view the underlying muscles.

Male Female Skeleton

As you dissect each muscle, study the figures and tables in a textbook and identify any corresponding (homologous) muscles of the human body. Also locate these homologous muscles in the torso or models of the human upper and lower limbs.

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