Posterior Triangle

Question 1

What are the boundaries of the posterior triangle

Answer 1

1) Sternocleidomastoid
2) trapezius muscle
3) middle third of clavicle

Question 2

What are the nerves of the posterior triangle

Answer 2

• accessory nerve
• parts of the brachial plexus
• cutaneous cervical nerves

Question 3

Role of the accessory nerve

Answer 3

• supplies Sternocleidomastoid and trapezius
  Three parts
  Upper - elevates scapula
  Middle - retraction of scapula
  Lower fibres go inferiority

Question 4

What are the lymph nodes

Answer 4

Small bean shaped
- filter lymph
- offer defence against the spread of infection
- returned to larger veins

Question 5

What are the superficial lymph nodes

Answer 5

Drain lymph in face, neck and scalp

Question 6

What are the deep lymph nodes

Answer 6

Left jugular trunk passes thoracic artery, left subclavian vein