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The ilioinguinal nerve is a branch of the first lumbar nerve (L1). It separates from the first lumbar nerve along with the larger iliohypogastric nerve . It emerges from the lateral border of the psoas major just inferior to the iliohypogastric , and passes obliquely across the quadratus lumborum and iliacus .
A labelled diagram of the nerves of the lumbar plexus in humans. Items portrayed in this file ... ilioinguinal nerve. lateral cutaneous nerve of thigh. nerve to psoas ...
The lateral cutaneous nerve of the thigh may have multiple branches. [1] Its position with relation to the ASIS can be very variable. [3] It may partially pass through sartorius muscle rather than over its surface. [1] It may be absent, and the sensory supply replaced by branches of the femoral nerve and the ilioinguinal nerve. [1]
The iliohypogastric nerve originates from the superior branch of the anterior ramus of spinal nerve L1. [2] It also receives fibers from T12 via the subcostal nerve. [2] The branch below it is the ilioinguinal nerve. [2]
Lumboinguinal nerve (green) and Ilioinguinal nerve (purple). In modern texts, these two regions are often considered to be innervated by the genitofemoral nerve. Medial cluneal nerves (pink) - labeled as "post. division of sacral" Inferior cluneal nerves (pink region, not designated with its own section)
3 nerves: genital branch of the genitofemoral nerve (L1/2), sympathetic and visceral afferent fibres, ilioinguinal nerve (N.B. outside spermatic cord but travels next to it) Note that the ilioinguinal nerve passes through the superficial ring to descend into the scrotum, but does not formally run through the canal.
The three terminal branches of this nerve are the iliohypogastric, ilioinguinal, and the genitofemoral nerves. L1 supplies many muscles, either directly or through nerves originating from L1. They may be innervated with L1 as single origin, or be innervated partly by L1 and partly by other spinal nerves. The muscles are: quadratus lumborum (partly)
The anterior scrotal nerves are branches of the ilioinguinal nerve. The nerves innervates the scrotum in males. The equivalent nerves in the female are the anterior labial nerves .