Nerve Variation

Question 1

Age has a negative correlation to brain size due to atrophy with the worst atrophy seen in males and in the L hemisphere

Answer 1

Gur et al., (1991)

Question 2

Visual cortex varies in its distribution through the occipital lobe

Answer 2

Uylings et al., (2005)

Question 3

Variation of the inferior alveolar nerve

Affects dental anaesthesia

Answer 3

Auluck et al., (2005)

Question 4

Auriculotemporal branch of the trigeminal

Textbook normal of 2 roots but 50% of cadavers had only one root while 37.5% had 2 and rest had 3 or 4

Answer 4

Gulekon et al., (2005)

Question 5

Various interconnecting pathways up and down the sympathetic chain (e.g. intrathoracic Nerve of Kuntz) which could affect efficacy of surgical procedures

Answer 5

Ramasroop et al., (2001)

Question 6

Lumbar ganglia not distributed segmentally and suggested just scattered going down the the lumbar vertebrae as opposed to symetrical paired arrangement
Found between 2 and 6

Answer 6

Murata et al., (2003)

Question 7

Accidental anesthetisation of the phrenic nerve occurred in 36-67% of interscalene nerve block resulting in paralysis of the ipsilateral hemidiaphragm

Answer 7

Gupta et al., (2009)

Question 8

Variation regarding the divisions of the sciatic nerve

Most common pattern is both passing under piriformis but 6 types in total including tibial not always under

Answer 8

Pokorny et al., (2006)

Question 9

Sural nerve variation
A combination of tibial and common peroneal in 61.7%, in 32.3% was a continuation of the tibial
Union sites also varied from popliteal fossa to the ankle and was asymetric in 80%

Answer 9

Mahakkanukrauh and Comsung, (2002)