Multiple Choice
The pectoral girdle is a structure formed by which of the following?
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7. The Skeletal System
The Pectoral Girdle
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Why does the pectoral girdle allow more freedom of movement compared to the pelvic girdle?
A
The pectoral girdle is not directly attached to the vertebral column.
B
The pectoral girdle is supported by stronger ligaments.
C
The pectoral girdle is fused to the rib cage.
D
The pectoral girdle has more bones than the pelvic girdle.
Verified step by step guidance1
Understand the anatomical structure of the pectoral girdle: The pectoral girdle consists of the clavicles and scapulae, which are connected to the sternum and not directly attached to the vertebral column. This allows for greater range of motion.
Compare the attachment of the pectoral girdle to the pelvic girdle: The pelvic girdle is directly attached to the vertebral column through the sacrum, providing stability but limiting movement.
Examine the role of ligaments: The pectoral girdle is supported by ligaments that allow for flexibility and movement, whereas the pelvic girdle has stronger ligaments that provide stability for weight-bearing functions.
Consider the fusion of bones: The pelvic girdle is fused to the sacrum and coccyx, which restricts movement, while the pectoral girdle is not fused to the rib cage, allowing for more mobility.
Analyze the number of bones: The pectoral girdle has fewer bones compared to the pelvic girdle, which contributes to its ability to move more freely.
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