Intermediate Scalene Muscles Quiz

Q1. From which cervical vertebral processes does anterior scalene principally arise?

• Posterior tubercles of C5-T1
• Bodies of T1-T4
• Spinous processes of C1-C4
• Anterior tubercles of C3-C6 transverse processes

Q2. From which cervical vertebral processes does middle scalene principally arise?

• Posterior tubercles of C2-C7 transverse processes
• Anterior tubercles of C1-C3 only
• Spinous processes of C5-T2
• Bodies of C3-C7

Q3. What surface landmark on the first rib receives anterior scalene?

• Head of the first rib
• Tubercle for serratus anterior
• Scalene tubercle
• Costal groove

Q4. How does anterior scalene separate the subclavian vessels?

• Both vessels pass anterior to the muscle
• The vein is anterior and the artery is posterior to anterior scalene
• The artery is anterior and the vein is posterior
• Both vessels pass posterior to middle scalene

Q5. What is the relationship of the phrenic nerve to anterior scalene?

• It descends posterior to middle scalene
• It lies within the subclavian artery
• It passes through the muscle belly
• It descends on the anterior surface of anterior scalene

Q6. Which fascial layer invests the scalene muscles?

• Prevertebral fascia
• Pretracheal fascia
• Buccopharyngeal fascia
• Investing fascia only

Q7. What is the interscalene interval?

• The space between anterior and middle scalene
• The space between platysma and skin
• The space between sternohyoid and sternothyroid
• The interval between the two carotid arteries

Q8. Which structure does not normally pass through the interscalene interval?

• Brachial plexus trunks
• Subclavian vein
• Subclavian artery
• Brachial plexus roots

Q9. What is the principal motor innervation of the scalene muscles?

• Vagus nerve only
• Anterior rami of cervical spinal nerves
• Accessory nerve only
• Facial nerve

Q10. What forms the floor of much of the posterior triangle deep to its fascial covering?

• Infrahyoid muscles only
• Pharyngeal constrictors only
• Prevertebral muscles including the scalenes
• Muscles of mastication