Inferior trunk of brachial plexus
Truncus inferior plexus brachialis
- Synonym: Lower trunk
- Related terms: Inferior trunk; Inferior trunk; Lower trunk; Brachial plexus : Inferior trunk; Lower trunk
Definition
The inferior trunk of brachial plexus is located in the floor of the posterior triangle of the neck and constitutes a part of the supraclavicular portion of the brachial plexus. It is formed by the union of the C8 and T1 nerve roots (ventral rami).
The supraclavicular portion of the brachial plexus is composed of three trunks: the superior, middle, and inferior trunks. Each of these trunks, including the inferior one, divides into two divisions: an anterior division and a posterior division.
References
Polcaro L, Charlick M, Daly DT. Anatomy, Head and Neck: Brachial Plexus. [Updated 2023 Aug 14]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK531473/
Drake, R.L., Vogl, A.W., and Mitchell, A.W.M. (2010). ‘Chapter 2: The Back’, in Gray’s anatomy for students. (2nd ed.) Churchill Livingstone Elsevier, Philadelphia PA 19103, pp.95-99 & Fig. 2.44 & 2.45.
Johnson EO, Vekris M, Demesticha T, Soucacos PN. Neuroanatomy of the brachial plexus: normal and variant anatomy of its formation. Surg Radiol Anat. 2010 Mar;32(3):291-7.
