Questions: Seminspinalis extends and rotates the head. The femoris is a four-headed muscle in the thigh.

Seminspinalis extends and rotates the head.

The femoris is a four-headed muscle in the thigh.
Transcript text: Seminspinalis $\square$ extends and rotates the head. The $\square$ femoris is a four-headed muscle in the thigh.
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Solution

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The answer is:

  1. Semispinalis capitis extends and rotates the head.
  2. The quadriceps femoris is a four-headed muscle in the thigh.

Explanation:

  1. Semispinalis capitis: This muscle is part of the semispinalis group of muscles, which are located in the back and are responsible for extending and rotating the head. The term "capitis" refers to the head, indicating that this muscle acts on the head.

  2. Quadriceps femoris: The quadriceps femoris is a large muscle group located in the front of the thigh. It is called "quadriceps" because it consists of four distinct muscles: the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius. These muscles work together to extend the knee and are crucial for walking, running, and jumping.

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