Q.12
All are true regarding axillary artery except?
A. It is a continuation of subclavian artery
B. It is crossed by pectoralis minor muscle
C. It extends from outer border of second rib to the lower border of teres minor.
D. The second part of part of axillary artery is posterior to pectoralis minor musc
Explanation :
Axillary artery extends from outer border of first rib to the lower border of teres major.
Pectoralis minor crosses the axillary artery and divides it into 3 parts.
First part – superior to the muscle.
Second part – posterior to the muscle.
Third part – inferior to the muscle.
Q.14
Regarding ansa cervicalis, all are true except?
A. Superior root is the continuation of the descending part of hypoglossal nerve
B. Inferior root is derived from the 4th cervical spinal nerve
C. Supplies the sternohyoid muscle
D. Lies embedded in the anterior wall of the carotid sheath
Explanation :
Inferior root of ansa cervicalis is derived from 2nd and 3rd cervical spinal nerves.
Ansa cervicalis is a thin nerve loop that lies embedded in the anterior wall of the carotid sheath.
It supplies sternohyoid, sternothyroid and inferior belly of omohyoid.
Fibers of the superior root are derived from the first cervical nerve.
Q.15
Roof the fourth ventricle is formed by all of the following except?
A. Inferior medullary velum
B. Superior medullary velum
C. Obex
D. Median eminence
Explanation :
Median eminence is seen in the floor of the fourth ventricle.
Roof of the fourth ventricle is formed by:
Superior medullary velum
Inferior medullary velum
Superior cerebellar peduncle
Tela choroidea of the the fourth ventricle
Taeniae with the obex
