Q____________Upper limb - soniashaik

[ArchivalUser]

After a forceps delivery of a male infant, the baby presents with his left upper limb adducted, internally rotated, and flexed at the wrist. The startle reflex is absent on the ipsilateral side. Which part of the brachial plexus was most likely injured during this delivery?
A. Lateral cord
B. Medial cord
C. Roots of the lower trunk
D. Root of the middle trunk
E. Roots of the upper trunk

[ArchivalUser]

E. Upper trunk

paralysis of abductor muscles = deltoid and supraspinatus
paralysis of lateral rotator muscle = infraspinatus
paralysis of forearm pronator = biceps

mmc is traumatic delivery, also Erb's palsy and a violent stretch of the head away from the shoulder