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10. Muscles

10. Muscles / Origin and Insertion / Problem 1

Which of the following muscles has its origin, insertion, and action incorrectly paired?

A

Biceps brachii - Origin: scapula; Insertion: radius; Action: elbow flexion, forearm supination.

B

Vastus intermedius - Origin: femur; Insertion: tibial tuberosity; Action: knee extension.

C

Rectus abdominis - Origin: pubis; Insertion: sternum and costal cartilages of ribs 5-7; Action: vertebral column rotation and flexion.

D

Masseter - Origin: maxilla and mandible near molar; Insertion: orbicularis oris; Action: hip extension, cheek compression.

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