Muscles of the Chest, Shoulder, & Upper Arm

What are the four muscles of the pectoral region?

What is the function of the pectoralis major muscle?

• Extends the upper limb

• Adducts and medially rotates the upper limb

• Flexes the lower limb

• Abducts the upper limb

Which nerves innervate the pectoralis major muscle?

• Radial and ulnar nerves

• pectoral nerves

• Phrenic nerves

• Axillary nerve

The pectoralis minor muscle originates from the (a)   and inserts into the ​ (b)   process of the ​ (c)   .

• 1st-2nd ribs

• 3rd-5th ribs
• 9th-11th ribs

• coracoid
• scapula
• acromion 
• clavicle

What is the function of the pectoralis minor muscle?

• Flexes the elbow

• Stabilises the scapula by drawing it anteroinferiorly

• Extends the shoulder

• Rotates the forearm

What is the function of the serratus anterior muscle?

• Depresses the clavicle

• Rotates and protracts the scapula

• Flexes the elbow

• Extends the wrist

Which nerve innervates the serratus anterior muscle?

• Long thoracic nerve

• Median nerve

• Ulnar nerve

• Radial nerve

What is the primary function of the subclavius muscle?

• Elevates the scapula

• Anchors and depresses the clavicle

• Flexes the shoulder

• Rotates the humerus

Where does the subclavius muscle originate?

• Lateral aspects of ribs 1-8

• Junction of the 1st rib and its costal cartilage

• Medial border of the scapula

• Superior surface of the clavicle

What clinical sign is produced if the long thoracic nerve is damaged?

• Winging of the scapula

• Foot drop

• Carpal tunnel syndrome

• Tennis elbow