[Functional anatomy of the facial nerve]. / Anatomie fonctionnelle du nerf facial.
Neurochirurgie
; 55(2): 113-9, 2009 Apr.
Article
em Fr
| MEDLINE
| ID: mdl-19298978
ABSTRACT
Embryologic individualization of the facial nerve primordium occurs early and emphasizes trigeminofacial connections and variations in the transitional zone (TZ). In the brainstem, the specific nuclei of the facial nerve are located within five columns corresponding to the main functions. Three-quarters of the fibers are of the special visceral efferent group (SVE). Central connections of the facial motonucleus are numerous, particularly with the trigeminal complex but also the cochlear nerves. Only endoneurium surrounds facial nerve fibers in the cerebellopontine angle; central nervous system tissue offers a small extracellular space, lacking collagen and funicular plexus, without epiperineurium nerve fibers are therefore more susceptible to injury. The segment of a nerve that reveals both CNS and PNS components is referred to as the transition zone. It should be regarded as a "locus minor resistae" because of poor vascularization and CNS myelin deficiency. The acousticofacial reflex is often absent in patients with hemifacial spasm. Early (R1) and late (R2) responses of the trigeminofacial reflex (blink reflex) in patients with hemifacial spasm are of major interest in understanding both peripheral and central mechanisms.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Nervo Facial
Limite:
Animals
/
Humans
Idioma:
Fr
Revista:
Neurochirurgie
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
França