Anatomy and Embryology Quiz

What is the origin of the serratus anterior muscle?

• By digitations from the upper 8 ribs

• From the spine of the scapula

• From the lower 5 ribs

• From the clavicle

Which nerve supplies the serratus anterior muscle?

• Long thoracic nerve

• Medial pectoral nerve

• Axillary nerve

• Radial nerve

What action does the serratus anterior muscle perform?

• Adduction of the shoulder

• Extension of the shoulder

• Protraction of the scapula

• Flexion of the shoulder

What is the deformity called when the medial border of the scapula is drawn backwards?

• Policeman's tip

• Claw hand

• Flat shoulder

• Winged scapula

What forms the base of the axilla?

• The skin and fascia

• The subscapularis

• The pectoralis major

• The humerus

Which structure is NOT a boundary of the apex of the axilla?

• Outer border of the first rib

• Superior border of scapula

• Pectoralis minor

• Middle third of the clavicle

What is the primary function of the brachial plexus?

• To connect the spine to the brain

• To control the diaphragm

• To supply the upper limb

• To supply the lower limb

Which of the following is a branch from the roots of the brachial plexus?

• Dorsal scapular nerve

• Musculo-cutaneous nerve

• Axillary nerve

• Ulnar nerve

What is the main action of the deltoid muscle's anterior fibers?

• Abduction of the shoulder

• Flexion and medial rotation

• Extension of the shoulder

• Protraction of the scapula

What is the most common cause of injury to the axillary nerve?

• Trauma to the neck

• Overuse of the arm

• Dislocation of the shoulder

• Fracture of the surgical neck of the humerus