Innervation of the thoracic cage and viscera

Question 1

How do ribs 1-7 attach to the sternum?

Answer 1

Costal cartilage

Question 2

Rhizotomy

Answer 2

Selective section of nerve roots for pain relief or spastic paralysis

Question 3

Spinal nerve innervation of heart

Answer 3

T1-5

Arm pain sx of heart attack because T1-3 dermatome

Question 4

Which are the atypical intercostal nerves and why?

Answer 4

1 has no cutaneous branch
2 runs in internal surface not intercostal groove
7 and 11 become thoracic-abdominal walls of anterior abdomen

Question 5

Innervation of the thoracic wall

Answer 5

Thoracic aorta
Subclavian artery
Axillary artery

Question 6

Sympathetic impact on thoracic organs

Answer 6

Fight or flight
Increases rate and strength of contraction, dilates coronary arteries
T1-5

Question 7

Parasympathetic impact on thoracic organs

Answer 7

Decreases rate and strength of contraction, constricts coronary arteries
CN 3,7,9 and 10
S2-4

Question 8

Sympathomimetics and parasympathetic antagonists

Answer 8

Used in asthma as bronchodilators (salbutamol B2 agonist)

Ipratropium is a p/s antagonist