Encyclopedia entry
Trochlear (CN IV) Nerve
Abstract
Variations in the branches and orbital course of the trochlear nerve have been described. The nerve has been reported to send a branch to M. orbicularis palpebrarum (orbicularis oculi) and to join sensory nerves (frontal, suprtrochlear, infratrochlear, and nasal). These branches probably represent an aberrant course of sensory fibers from the trigeminal nerve. One variation in the orbital course consists of the trochlear piercing (instead of coursing over) M. levator palpebrae superioris on its way to the superior oblique muscle.
Variations in the branches and orbital course of the trochlear nerve have been described.
The nerve has been reported to send a branch to M. orbicularis palpebrarum (orbicularis oculi) and to join sensory nerves (frontal, suprtrochlear, infratrochlear, and nasal). These branches probably represent an aberrant course of sensory fibers from the trigeminal nerve. One variation in the orbital course consists of the trochlear piercing (instead of coursing over) M. levator palpebrae superioris on its way to the superior oblique muscle.
Riferimenti dell’opera originale
Elenco riportato come compare nella fonte, senza normalizzazione dei formati bibliografici.
- Cordier, -. et -. Coulouma. (1932) Recherches sur les nerfs du sinus carotidien et sur leurs variations. Assoc. Anatomistes Comptes Rendus 27:161-178.
- Benninghoff, A. (1952) Lehrbuch der Anatomie des Menschen. Urban & Schwarzenberg, Munich, 1952.
- Cruveilhier, -. (1851) Traité d'Anatomie Descriptive, 3rd ed., G. Doin & Cie., Paris.
- Huber, G.C., Ed. (1930) Piersol's Human Anatomy, 9th ed., L.B. Lippincott Co., Philadelphia.
- Jackson, C.M., Ed. (1933) Morris' Human Anatomy, 9th ed., P. Blakiston's Son & Co., Inc., Philadelphia.
- Kopsch, F. (1908) Rauber's Lehrbuch der Anatomie des Menschen, Georg Thieme, Leipzig.
- Schaefer, E.A., Symington, J. and T.H. Bryce, Eds. (1915) Quain's Anatomy, 11th ed., Longmans, Green, and Co., London.
- Whitnall, S.E. (1932) The Anatomy of the Human Orbit, 2nd ed., Oxford University Press, London.
Anatomical classification
- Systems:
- Nervous system
Content provenance
Adaptation
Adaptation of «Trochlear (CN IV) Nerve — Illustrated Encyclopedia of Human Anatomic Variation: Opus I: Muscular System» by Ronald A. Bergman, Adel K. Afifi, Ryosuke Miyauchi. Source: https://www.anatomyatlases.org/AnatomicVariants/NervousSystem/Text/TrochlearNerve.shtml Original work distributed under the CC BY-NC-SA 4.0 licence (https://creativecommons.org/licenses/by-nc-sa/4.0/deed.it). Adaptation by Redazione AIVA. Changes from the original: Testo originale inglese riprodotto integralmente e riorganizzato nel formato scheda del portale (sintesi, testo, riferimenti), senza modificarne le affermazioni. La traduzione italiana non è ancora stata eseguita, e la pagina lo dichiara. Le figure non sono state copiate: sono collegate alla pagina d’origine. This publication is not approved or endorsed by the authors of the original work.
Licence
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