Intermediate Branch of Posterior Ramus of First Lumbar Nerve (Right)
Ramus posterior intermedius nervi lumbalis primi
Read moreQuick Facts
Origin: Lateral branch of posterior ramus of the first lumbar nerve (L1).
Course: Continues dorsally and caudally.
Branches: None.
Supply: Lumbar fibers of longissimus thoracis muscle.
Related parts of the anatomy
Origin
After the posterior ramus of the first lumbar nerve (L1) has traversed through the intertransverse ligament and medial intertransverse muscle, it divides into medial and lateral branches. The lateral branch continues a short distance before giving rise to an intermediate branch.
Course
The intermediate branch passes dorsally and caudally through the intertransverse space and enters the longissimus thoracis muscle. It remains intermuscular (Bogduk, Wilson and Tynan, 1982).
Branches
There are no named branches.
Supplied Structures & Function
The intermediate branch supplies the lumbar fibers of longissimus thoracis muscle.
References
Bogduk, N., Wilson, A. S. and Tynan, W. (1982) 'The human lumbar dorsal rami', J Anat, 134(Pt 2), pp. 383-97.
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Lumbar Nerves
The ileoinguinal nerve arises from the first lumbar nerve, giving branches to the obliquus internus muscle and to the skin covering the mons pubis and labia majora.
