Top 150+ Solved Thorax MCQ Questions Answer
Q. With regard to the cutaneous innervation of the thorax and abdomen:
a. above the 2nd rib, the skin is supplied by the cervical plexus (C4)
b. loss of a single spinal segment will produce a sensory deficit
c. it is supplied segmentally by the anterior primary rami of T1 to L1
d. T8 supplies skin at the level of the umbilicus
e. the lower eight thoracic nerves pass beyond the costal margin to supply the skin of the abdominal wall
Q. With regard to the diaphragm, which is NOT true?
a. in full expiration, the right dome ascends to the level of the nipple
b. the central tendon lies at the level of the xiphisternal joint
c. the longest fibres arise from the 9th costal cartilage
d. the branches of the phrenic nerves run over the thoracic surface radially
e. it is pierced by inferior vena cava at T8 level and by oesophagus at T10 level
Q. The trachea:
a. bifurcates at a variable level according to respiration
b. is supplied by the superior thyroid arteries
c. commences at C5 level
d. is non elastic and is supported by cartilaginous rings
e. is in contact with the recurrent laryngeal nerve on the right
Q. Which is NOT located at the level of the lower border of T4 vertebra?
a. the most superior part of the arch of the aorta
b. azygous vein enters the superior vena cava
c. thoracic duct reaches the left side of the oesophagus as it ascends
d. ligamentum arteriosum
e. superficial and deep parts of the cardiac plexus
Q. In the anatomical position, the heart:
a. has a right border comprised of right atrium and right ventricle
b. has an anterior (sternocostal) surface comprised of right atrium, right ventricle and a strip of left ventricle
c. has a posterior surface comprised of left atrium, four pulmonary veins and left ventricle
d. has an inferior (diaphragmatic) surface comprised of left atrium, inferior vena cava and right ventricle
e. all of the above are true
Q. Which is NOT USUALLY supplied by the right coronary artery?
a. sinoatrial nodal artery
b. atrioventricular nodal artery
c. conus artery
d. right bundle of HIS
e. posterior part of the interventricular septum
Q. With regard to lymphatic drainage in the thorax, which is NOT true?
a. the anterior intercostal spaces drain into parasternal nodes thence to brachiocephalic veins
b. mid-part of oesophagus drains to the paraaortic nodes beside the descending aorta
c. the lower posterior intercostal groups of nodes drain into cysterna chyli
d. the heart drains into the tracheobronchial nodes thence to mediastinal, lymph trunks
e. the mediastinal lymph trunks lie alongside the trachea
Q. With regard to the oesophagus, which is NOT true?
a. the upper part is supplied by the recurrent laryngeal nerve
b. the upper third has skeletal muscle whereas the lower two thirds is smooth muscle
c. the narrowest part is where it passes through the diaphragm
d. oesophageal pain can be referred to the neck, arm and thoracic wall
e. pierces the diaphragm at the level of T10 vertebral body
Q. With respect to the blood supply of the hearts, which answer is INCORRECT?
a. the left coronary artery and its branches are the main blood supply to the interventricular septum
b. the coronary sinus receives the great cardiac vein
c. anterior cardiac veins drain directly into the right atrium
d. the sinoatrial nodes is, in a majority of cases, supplied by the left coronary artery
e. the right coronary artery gives off a marginal branch at the inferior border of the heart
Q. With regard to the phrenic nerve:
a. its fibres are exclusively motor
b. it is predominantly sensory
c. the right phrenic nerve lies anterior to the right lung root
d. it divides into anterior posterior and medial divisions on the thoracic surface of the diaphragm
e. it divides into anterior posterior and medial divisions on the abdominal surface of the diaphragm
Q. Regarding the cardiac veins:
a. the great cardiac vein accompanies the posterior descending interventricular artery
b. the middle cardiac vein ends in the right atrium
c. the anterior cardiac vein ends in the right atrium
d. the small cardiac vein accompanies the circumflex branch of the left coronary artery
e. the oblique veins of the left atrium end in the left atrium
Q. With regard to the intercostal neurovascular bundle:
a. it maintains a close association with the superior posterior aspect of its own rib
b. it travels in a neurovascular plane between external and internal muscle layers
c. the artery has a longer course around the body wall than the nerve
d. the nerve is always inferior to the artery
e. the vein may travel below the nerve
Q. A needle inserted between the xiphoid process and 7th left intercostal cartilage for the purpose of pericardiocentesis passes through all the following structures EXCEPT:
a. central tendon of diaphragm
b. serous pericardium
c. rectus sheath
d. fibrous pericardium
e. pleura
Q. The parietal pleura in an average sized adult male:
a. projects 3cm above the medial third of the upper surface of the clavicle
b. projects 2cm beyond the thoracic outlet
c. projects 1cm above the inner border of the first rib
d. does not project above the upper surface of the clavicle
e. none of the above
Q. Regarding the chest wall:
a. the intercostal artery runs between the external and internal intercostal muscles
b. the muscles of outer thoracic wall layer are serratus posterior superior, serratus posterior inferior only
c. the 5th posterior intercostal vein, artery and nerve run on the lower border of the 5th rib
d. the order of structures in the intercostal space are artery, vein, nerve
e. the 1st intercostal nerve supplies skin over the anterior chest wall