Question

gross anatomy of skeletal muscles
it is beyond the scope of this book to describe the hundreds of skeletal muscles of the human body. we describe only the most important (1 ) here. all the superficial muscles we consider are summarized in tables 6 - 3 and 6 - 4 and illustrated in the overall body views shown later in the chapter (figures 9.22 and 9.23)
head and neck muscles
the head muscles (figure 6.16, p. 204) are an interesting group. they have many specific functions but are usually (2 ) into two large categories - facial muscles and chewing muscles. facial muscles are unique because they insert into soft tissues, such as other muscles or skin. when they pull on the skin of the face, they permit us to express ourselves by frowning, smiling, and so forth. the chewing muscles begin to (3 ) down food for the body. all head and neck muscles we describe are paired except for the platysma, occipitalis, frontalis, and occipitalis.
facial muscles
frontalis
the frontalis, which covers the frontal bone, runs from the (4 ) aponeurosis to the skin of the eyebrows, where it inserts. this muscle allows you to raise your eyebrows, as in surprise, and to wrinkle your forehead. at the posterior end of the cranial aponeurosis is the occipitalis muscle, which covers the (5 ) aspect of the skull and pulls the scalp posteriorly.

1. grouped 2. break 3. cranial 4. posterior 5. muscles
2. break 2. cranial 3. posterior 4. muscles 5. grouped
3. cranial 2. posterior 3. muscles 4. grouped 5. break
4. posterior 2. muscles 3. grouped 4. break 5. cranial
5. muscles 2. grouped 3. break 4. cranial 5. posterior

Explanation:

1. In the context, it is stated that only the most important "muscles" are described, fitting the first blank.
2. Head muscles are "grouped" into two large categories, which is a common way to classify them in anatomy, filling the second blank.
3. Chewing muscles are responsible for "breaking" down food for the body, which is their main function, so this fills the third blank.
4. The frontalis muscle runs from the "cranial" aponeurosis to the skin of the eyebrows, which is a correct anatomical description for the fourth blank.
5. The occipitalis muscle covers the "posterior" aspect of the skull and pulls the scalp posteriorly, fitting the fifth blank.

Answer:

1. muscles
2. grouped
3. break
4. cranial
5. posterior