Arm Questions and Answers
Radial nerve
The major nerve of the upper limb that is most at risk of injury by a fracture of the midshaft of the humerus.
Ulnar nerve
The major nerve of the upper limb that is most at risk of injury by a fracture of the medial epicondyle of the humerus.
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Arm Questions and Answers
Radial nerve - answer The major nerve of the upper limb that is most at risk of injury
by a fracture of the midshaft of the humerus.
Ulnar nerve - answer The major nerve of the upper limb that is most at risk of injury
by a fracture of the medial epicondyle of the humerus.
Colles' fracture - answer -A fracture of the distal end of the radius in which the
fracture extends transversely through the distal radius and results in the distal fragment
being both posteriorly displaced and posteriorly angulated. -Typically occurs in
osteoporitic patients when they fall with an outstretched hand
Elbow joint - answer -A synovial joint.
-Where the head of the radius articulates with the capitulum of the humerus and the
trochlear notch of the ulna articulates with the trochlea of the humerus.
-Provides for flexion and extension of the forearm.
Proximal radioulnar joint - answer -Synovial joint
-Joint in which the head of the radius articulates with the radial notch of the ulna.
-Provides for pronation and supination of the forearm
Annular ligament - answer A "C"-shaped ligament that surrounds the head of the
radius in the proximal radioulnar joint.
-Helps stabilize the articulation of the head of the radius with the radial notch of the
ulna.
Distal radialulnar joint - answer -Joint in which the head of the ulna articulates with
the ulnar notch of the radius.
-Provides for pronation and supination of the forearm
Pulled elbow - answer -Occurs mostly in younger children
-Annular ligament becomes entrapped between the head of the radius and the
capitulum of the humerus.
-Xrays will not show any displacement of the head of the radius.
-Must stabilize the child's elbow and palpate the head of the radius with one hand, then
slowly and firmly supinate and flex the forearm with the other hand.
Musculocutaneous nerve - answer -Innervates all of the anterior arm muscles.
-2 most important: biceps brachii and brachialis
Biceps brachii - answer Chief supinator and major flexor of the forearm.
Brachialis - answer The chief flexor of the forearm.
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