Problem Analysis:
The image provided is an
inferior view of the skull, and the task involves identifying a specific bone and its associated joint, as well as describing the movement that occurs at that joint. Let's break this down step by step.
#### Step 1: Identify Bone #4
From the labeled diagram, we need to identify what bone corresponds to label
#4. Based on the inferior view of the skull,
bone #4 is the
occipital bone. The occipital bone is located at the base of the skull and is easily identifiable due to its large size and the presence of the
foramen magnum (the large opening through which the spinal cord passes).
#### Step 2: Identify the Vertebra That Forms a Joint with the Occipital Bone
The occipital bone forms a joint with the
first cervical vertebra, also known as the
atlas (C1). This joint is called the
atlanto-occipital joint. The atlas is named after the Greek mythological figure Atlas, who held up the sky, as it supports the weight of the head.
-
Name: Atlas
-
Number: C1
-
Nickname: None (Atlas is already a nickname/reference)
#### Step 3: Describe the Movement at the Atlanto-Occipital Joint
The atlanto-occipital joint allows for
flexion and extension of the head. This means the head can move forward (flexion) and backward (extension) relative to the neck. This joint is crucial for nodding movements (e.g., when you say "yes").
Final Answers:
1.
What vertebra (name, #, and nickname) creates a joint with #4 on the picture above?
-
Answer: The first cervical vertebra (C1), also known as the
atlas.
2.
What movement occurs at the joint noted in question #1 above?
-
Answer: Flexion and extension of the head.
Boxed Final Answer:
\[
\boxed{
\text{1. Atlas (C1)} \\
\text{2. Flexion and extension}
}
\]
Parent Tip: Review the logic above to help your child master the concept of blank skull worksheet.
