Thorax

Question 1

Structure passing through thoracic inlet

Answer 1

Muscles - sternohyoid, sternothyroid
Tubes- trachea, esophagus
Arteries- brachiocephalic trunk, left subclavian, left common carotid, internal thoracic, superior intercostal arteries
Nerves- recurrent laryngeal nerve, vagus nerve
Sympathetic chains
Thoracic nerve
Phrenic nerve
Veins-
Brachiocephalic veins
1st posterior intercostal veins
Inferior thyroid veins

Question 2

Sibsons fascia attachments

Answer 2

Apex- transverse process of C7 vertebra
Base- inner boundary of cartilagenous part of first rib
Superior surface- subclavian vessels
Inferior surface- cervical pleura

Question 3

Functions of sibsons fascia

Answer 3

It protects the cervical pleura which protects the apex of the lung
It resists intra thoracic pressure during inspiration and exhalation such that neck is not puffed up and down during respiration

Question 4

Boundaries of mediastinum

Answer 4

Anterior- sternum
Posterior - vertebral column
Superior- superior thoracic aperture
Inferior- diaphragm
One each side- mediastinal pleura