Procedure

1. Review textbook sections on muscles of facial expression, muscles of mastication, and muscles that move the head and vertebral column.

2. As a review activity, label figures 20.1, 20.2, and 20.3.

3. Locate the following muscles in the torso and in your own body whenever possible:

epicranius (frontalis and occipitalis)

orbicularis oculi orbicularis oris buccinator zygomaticus platysma masseter temporalis medial pterygoid lateral pterygoid sternocleidomastoid splenius capitis semispinalis capitis longissimus capitis (of erector spinae group)

4. Demonstrate the action of these muscles in your own body.

5. Locate the origins and insertions of these muscles in the human skull and skeleton.

6. Complete Parts A, B, and C of Laboratory Report 20.

Web Quest

Determine the origin, insertion, action, nerve innervation, and blood supply of all the major muscles.

Identify muscles and detailed explanations from an interactive site.

Find information about these topics at http:// www.mhhe.com/biosci/abio/martinlmwq.mhtml

Girdle InsertionsErector Spinae Nerve SupplyHuman Heart Block Surgery
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