Lec 1 Thoracic wall quiz

What is the function of the external intercostal muscles?

• Depress ribs

• Elevate ribs

• Adduct the upper limb

• Flex the upper limb

Answer explanation

The function of the external intercostal muscles is to elevate ribs.

Which nerve provides motor innervation to the diaphragm?

• Femoral nerve

• Sciatic nerve

• Phrenic nerve

• Vagus nerve

Answer explanation

The phrenic nerve provides motor innervation to the diaphragm, making it the correct choice.

At what vertebral level is the caval opening of the diaphragm located?

• T12

• L1

• T10

• T8

Answer explanation

The caval opening of the diaphragm is located at the T8 vertebral level.

What is the main arterial supply to the diaphragm?

• Superior phrenic artery

• Inferior phrenic artery

• Pericardiacophrenic artery

• Azygous vein

Answer explanation

The main arterial supply to the diaphragm is the Inferior phrenic artery.

Which muscle forms part of the anterior wall of the axilla region?

• Serratus posterior superior

• Pectoralis major

• Transversus thoracis

• Levatores costarum

Answer explanation

The pectoralis major muscle forms part of the anterior wall of the axilla region.

What is the primary role of the intercostal muscles in respiration?

• Adduct the upper limb

• Depress the ribs

• Flex the upper limb

• Support intercostal space

Answer explanation

The primary role of the intercostal muscles in respiration is to support the intercostal space, aiding in the expansion and contraction of the rib cage during breathing.

Which structure does not pass through the diaphragm?

• Inferior vena cava

• Oesophagus

• Aorta

• Trachea

Answer explanation

The trachea does not pass through the diaphragm, unlike the inferior vena cava, oesophagus, and aorta.

What is the function of the scalene muscles?

• Fix 1st and 2nd rib

• Flex the upper limb

• Elevate ribs during forced inspiration

• Depress inferior ribs

Answer explanation

The function of the scalene muscles is to fix the 1st and 2nd rib in place.

Which bone forms part of the thoracic wall?

• Patella

• Femur

• Humerus

• Ribs

Answer explanation

The bone that forms part of the thoracic wall is the Ribs.

What is the main function of the diaphragm during inspiration?

• Depress the ribs

• Contract the abdominal muscles

• Elevate the ribs

• Increase thoracic volume

Answer explanation

During inspiration, the main function of the diaphragm is to increase thoracic volume by contracting and moving downward, creating a negative pressure that allows air to enter the lungs.