Updated: 4/2/2017

Anterior interosseous nerve

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Topic
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N/A
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Questions
1
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Evidence
2
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Topic
https://upload.orthobullets.com/topic/10107/images/graphic-2.large.jpg
https://upload.orthobullets.com/topic/10107/images/ain lineage.jpg
https://upload.orthobullets.com/topic/10107/images/anterior_interosseous_lesion1345527186191.jpg
Course
  • Origins
    • arises from the median nerve at the radiohumeral joint line
    • C5-T1 roots
      • medial and lateral cord of brachial plexus
        • median nerve
          • AIN
            • branch to FDP 
            • branch to FPL
            • branch to pronator quadratus
  • Course  
    • arises 5-8 cm distal to lateral epicondyle
    • passes between two heads of pronator teres
    • runs along the volar surface of the FDP 
    • courses distally along the interosseous membrane
    • terminates in PQ near wrist joint
Motor Innervation
  • Motor
    • deep forearm muscles
      •  flexor digitorum profundus  - radial half
      •  flexor pollicis longus 
      •  pronator quadratus 
Sensory Innervation
  • Sensory
    • sensory fibers to volar wrist joint capsule
    • no cutaneous innervation
Clinical Conditions
  • AIN compressive neuropathy 
  • Pediatric supracondylar fractures 

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Questions (1)

(OBQ11.255) A 4-year-old male falls from monkey bars and sustains an extension supracondylar humerus fracture with a neurologic deficit. Which of the following muscles is most likely affected?

QID: 3678
1

Extensor digitorum communis

11%

(505/4424)

2

Pronator quadratus

69%

(3034/4424)

3

Flexor carpi radialis

11%

(479/4424)

4

Flexor digitorum profundus to small/ring fingers

6%

(271/4424)

5

Flexor carpi ulnaris

3%

(119/4424)

L 3 C

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Evidence (2)
VIDEOS & PODCASTS (1)
EXPERT COMMENTS (1)
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