The serratus anterior is a fan-shaped muscle located between the lateral thorax wall and the scapula. It is divided into superior, intermediate, and inferior parts, originating from the first to ninth ribs. The muscle is innervated by the thoracic longus nerve and functions to displace the shoulder blade and elevate the ribs, aiding in respiration. The inferior part supports arm elevation above 90 degrees.

Where is the serratus anterior muscle primarily located?

• On the posterior side of the arm

• In the lower back region

• On the anterior side of the thigh

• Between the lateral thorax wall and the scapula

Which part of the serratus anterior muscle is the strongest?

• Superior part

• Medial part

• Intermediate part

• Inferior part

What nerve innervates the serratus anterior muscle?

• Thoracic longus nerve

• Femoral nerve

• Sciatic nerve

• Radial nerve

How does the serratus anterior muscle assist in respiration?

• By compressing the lungs

• By elevating the ribs

• By expanding the diaphragm

• By contracting the abdominal muscles

What role does the inferior part of the serratus anterior play in arm movement?

• It restricts arm movement

• It flexes the wrist

• It stabilizes the elbow joint

• It supports arm elevation above 90 degrees