open access

Ahead of Print
Case report
Published online: 2020-10-27
Submitted: 2020-07-24
Accepted: 2020-10-18
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An unusual anatomical variant of the left phrenic nerve encircling the transverse cervical artery

J. H. Lee, H. T. Kim, I. J. Choi, Y. R. Heo, Y. W. Jung
DOI: 10.5603/FM.a2020.0131
·
Pubmed: 33124034

open access

Ahead of Print
CASE REPORTS
Published online: 2020-10-27
Submitted: 2020-07-24
Accepted: 2020-10-18

Abstract

During educational dissection of cadavers, we encountered anatomical variability of the left phrenic nerve. In this cadaver, nerve fibers from C3 and C4 descended and crossed behind the transverse cervical artery (TCA), a branch of the thyrocervical trunk, at the level of the anterior scalene muscle. On the other hand, nerve fibers from C5 descended obliquely above the TCA and then joined the fibers from C3-4 on the medial side of the anterior scalene muscle to form the phrenic nerve. To our knowledge, the encircling of the TCA by the left phrenic nerve in the neck has not yet been reported and may pose as a potential risk for nerve compression during movement of the neck. We discuss several types of anatomical variants of the phrenic nerve and the associated risk during thorax and neck dissection procedures.

Abstract

During educational dissection of cadavers, we encountered anatomical variability of the left phrenic nerve. In this cadaver, nerve fibers from C3 and C4 descended and crossed behind the transverse cervical artery (TCA), a branch of the thyrocervical trunk, at the level of the anterior scalene muscle. On the other hand, nerve fibers from C5 descended obliquely above the TCA and then joined the fibers from C3-4 on the medial side of the anterior scalene muscle to form the phrenic nerve. To our knowledge, the encircling of the TCA by the left phrenic nerve in the neck has not yet been reported and may pose as a potential risk for nerve compression during movement of the neck. We discuss several types of anatomical variants of the phrenic nerve and the associated risk during thorax and neck dissection procedures.

Get Citation

Keywords

phrenic nerve, transverse cervical artery, variation

About this article
Title

An unusual anatomical variant of the left phrenic nerve encircling the transverse cervical artery

Journal

Folia Morphologica

Issue

Ahead of Print

Article type

Case report

Published online

2020-10-27

DOI

10.5603/FM.a2020.0131

Pubmed

33124034

Keywords

phrenic nerve
transverse cervical artery
variation

Authors

J. H. Lee
H. T. Kim
I. J. Choi
Y. R. Heo
Y. W. Jung

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