Muscles of the pectoral region

Question 1

What is the innervation, function and blood supply of the pectoralis major?

Answer 1

• Lateral and medial pectoral nerves
• Pectoral branch of the thoraco-acromial artery
• Adducts and medially rotates upper limb. Draws the scapula anteroinferiorly. Flex the upper limb.

Question 2

What is the innervation, function and blood supply of the pectoralis minor?

Answer 2

• Medial pectoral nerve
• Thoraco- acromial and internal thoracic artery
• Stabilises the scapula by drawing it anteroinferiorly against the thoracic wall

Question 3

What is the innervation, function and blood supply of the Serratus anterior?

Answer 3

• Long thoracic nerve.
• Lateral thoracic artery
• Rotates the scapula, allowing the arm to be raised over 90 degrees. It also holds the scapula against the ribcage.

Question 4

What happens in a wing scapula?

Answer 4

• Damage to long thoracic nerve caused by traction injury of upper limb.

Question 5

What is the innervation, function and blood supply of the subclavius?

Answer 5

• Nerve to Subclavius.
• Clavicular branch of thoraco-acromial
• Anchors and depresses the clavicle.