BRS: Gross Anatomy Exam Questions & Answers | 100 Questions with 100% Correct Answers | Updated 2024 | Guaranteed A+

BRS: Gross Anatomy Exam Questions & Answers | 100 Questions with 100% Correct Answers | Updated 2024 | Guaranteed A+ If a stab wound lacerated the posterior humeral circumflex artery passing through the quadrangular space on the shoulder region, which of the following nerves would be injured? A) Radial nerve B) Axillary nerve C) Thoracodorsal nerve D) Suprascapular nerve E) Accessory nerve - answerB) The axillary nerve runs posteriorly to the humerous, accompanying the posterior humeral circumflex artery through the quadrangular space and innervating the teres minor and deltoid muscles - none of the other nerves pass through the quadrangular space A victim of an automobile absent is unable to abbduct her left arm. This indicated damage to which of the following parts of the brachial plexus? A) Middle trunk & posterior cord B) Middle trunk & lateral cord C) Lower trunk & lateral cord D) Upper trunk & posterior cord E) Lower trunk & medial cord - answerD) Both upper trunk and posterior cord are damaged - abductors of the arm are deltoid (axillary nerve from posterior cord) and supraspinatus (suprascapular nerve from upper trunk) - middle and lower trunk give rise to no branches - lateral and medial cords supply no abductors of the arm In order for an engineer to construct a prosthetic arm, he will need to know that which of the following muscles flexes the elbow and is innervated by the radial nerve? A) Flexor digitorum longus B) Brachioradialis C) Brachialis D) Extensor digitorum longus E) Biceps brachii - answerB) Brachioradialis is innervated by radial nerve and functions to flex the elbow - flexor digitorum longus and extensor digitorum longus don't act in the elbow - biceps brachii and brachialis flex the elbow and are innervated by musculocutaneous nerve A little boy was playing on a playground when he fell and struck his arm against the swing set. He ran to the school nurse complaining of which of the following conditions as a result of injuring the radial nerve in the groove of the humerus? A) Numbness over the medial side of the forearm B) Inability to oppose the thumb C) Weakness in pronating the arm D) Weakness in abducting the arm F) Inability to extend the hand - answerF) Radial nerve innervates the extensor muscles of the hand - numbness would occur on the posterior aspects of the arm and forearm - skin over the medial side is innervated by medial antebrachial cutaneous nerve - inabliity to oppose thumb or weakness in controlled by medial nerve - pronator forearm is from opponens pollicis, pronator teres, and pronator quadratus - abductors of the arm, deltoid and supraspinatus, are innervated by axillary nerve and upper trunk of brachial plexus A soccer play falls to the ground and fractures the medial epicondyle of the humerus. Which of the following symptoms might she present with when seeing a physician in the ER? A) Impaired abduction of the hand B) Carpal tunnel syndrome C) Wrist drop D) Thenar atrophy E) Inability to seat on medial part of the hand - answerE) this fracture might injure the ulnar nerve which supplies the skin of the medial side of the hand causing no cutaneous sensation and lack of sweating in this area - abduction of hand: flexor carpi radialis (median nerve) and extensor carpi radialis longus/brevis (radial nerves) - carpel tunnel and thenar arrophy result in a lesion of the median nerve whereas a wrist drop results from a lesion of the radial nerve After winning a boxing match, a 24-year-old man is unable to abduct his fingers. Which of the following nerves is injured? A) Ulnar nerve B) Median nerve C) Radial nerve D) Musculocutaneous nerve E) Axillary nerve - answerA) Ulnar n innervates dorsal interossei which are the only abductors of the fingers - little finger is by