An anatomical Variation of the Lesser Occipital Nerve in the “Carefree part” of the Posterior Triangle

Ravindra, Swamy S; Sirasanagandla, Srinivasa Rao; Nayak, Satheesha B.; M, Rao Kg; Patil, Jyothsna

doi:10.7860/jcdr/2014/7423.4276

Cited by 9 publications

(6 citation statements)

References 12 publications

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“…In this case, a normal LON was observed with an additional branch superficial to it that arose from the SAN. Previous cases have been described in which the LON itself arises from the SAN [5], or when there are communicating branches between the two nerves [13]. However, the case reported herein is unique in that it had a normal LON with an additional cutaneous branch arising from the SAN overlying it.…”

Section: Discussionmentioning

confidence: 67%

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Cutaneous Branch of the Spinal Accessory Nerve: Case Report With Potential Relevance to Occipital Neuralgia

Patel¹,

Watson

Olewnik

et al. 2021

Cureus

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We describe a case in which a cutaneous branch was found arising from the spinal accessory nerve, a nerve typically characterized as a purely motor nerve. Although reported anatomical variations of the lesser occipital and spinal accessory nerves are uncommon, rare variants have been reported. Such anatomy might result in unexpected patient presentations or rare complications following spinal accessory nerve injury.

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Section: Discussionmentioning

confidence: 67%

“…One instance described a variation of the LON in which it provided communicating branches to the SAN [13].…”

Section: Discussionmentioning

confidence: 99%

Cutaneous Branch of the Spinal Accessory Nerve: Case Report With Potential Relevance to Occipital Neuralgia

Patel¹,

Watson

Olewnik

et al. 2021

Cureus

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“…Duplication of the LON has been reported by Lucas et al and Gupta et al [4,5], while Madhavi and Holla reported a case in which the LON was triplicated bilaterally [6]. Another rare variation reported was the passage of the LON through the "carefree" region of the posterior triangle [7]. Rarely, the LON has been seen arising from the spinal accessory nerve, but these cases have also had C2 connections to the latter nerve and thus probably represent the C2 fibers of the LON "hitchhiking" along the accessory nerve [8].…”

Section: Discussionmentioning

confidence: 92%

A Rare Anatomical Variation of the Lesser Occipital Nerve

Chabot¹,

Iwanaga²,

Dumont³

et al. 2021

Cureus

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The lesser occipital nerve (LON) is a cutaneous branch of the cervical plexus that arises from the second and sometimes the third spinal nerve and innervates the scalp. During routine dissection of the neck, the LON was observed to arise directly from the spinal accessory nerve. The aberrant nerve measured 1.9 mm in diameter and 10.2 cm in length. Although anatomical variations of the LON such as duplication and triplication have been observed, we believe the origination of this nerve directly and exclusively from the spinal accessory nerve is exceedingly rare. The current case adds to the sparse literature on the variations of the LON and might be of interest to clinicians treating neurological conditions or surgeons operating in the area.

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“…A smaller proportion of LONs (15% of individuals) were observed at different locations from the mid-super cial surface of the SCM muscle to within 1 cm of the GON. Sirasanagandla et al stated a case report in which the LON's course was similar to the LON-III but pierced the TM fascia at a lower level 10 . Tubbs et al dissected 10 cadavers and used the notion of 'type' for the rst time 11 .…”

Section: Morphological Featuresmentioning

confidence: 99%

Morphological and morphometric anatomy of the lesser occipital nerve and its possible clinical relevance

Sağlam,

Coşkun,

Gayretli

2024

Preprint

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The lesser occipital nerve (LON) has one of the most variations among occipital nerves. We aimed to investigate morphological and morphometric features of LON. Twenty-four cadavers were dissected bilaterally. LON was classified into 3 types. The number of branches and the perpendicular distances of the point where LON emerged from the posterior border of sternocleidomastoid muscle (SCM) to vertical and transverse lines passing through external occipital protuberance (EOP) were determined. The shortest distance between LON and greater auricular nerve (GAN), and linear distance of LON to its branching point were measured. The most common variant was Type 1 (30 sides, 62.5%), followed by Type 2 (12 sides, 25%) and Type 3 (6 sides, 12.5%), respectively. On 48 sides, 2-9 branches of LON were observed. The perpendicular distance of said point to vertical and transverse lines was meanly 63.69±11.28 mm and 78.83±17.21 mm, respectively. The shortest distance between LON and GAN was meanly 16.62±10.59 mm. The linear distance of LON to its branching point was meanly 31.24±15.95 mm. The findings reported in this paper may help clinicians in estimating the location of the nerve and/or its branches for block or decompression surgery as well as preservation of LON during related procedures.

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An anatomical Variation of the Lesser Occipital Nerve in the “Carefree part” of the Posterior Triangle

Cited by 9 publications

References 12 publications

Cutaneous Branch of the Spinal Accessory Nerve: Case Report With Potential Relevance to Occipital Neuralgia

Cutaneous Branch of the Spinal Accessory Nerve: Case Report With Potential Relevance to Occipital Neuralgia

A Rare Anatomical Variation of the Lesser Occipital Nerve

Morphological and morphometric anatomy of the lesser occipital nerve and its possible clinical relevance

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