Plan of lumbar plexus . (Ilioinguinal visible at upper left.)
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| colspan="2" |The lumbar plexus and its branches. (Ilioinguinal visible at upper left.)
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|Latin n. ilioinguinalis
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|[subject #212 ]
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|Innervates
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|From
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|MeSH [
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|Dorlands/Elsevier [/ ]
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The Ilioinguinal Nerve , smaller than the Iliohypogastric nerve , arises with it from the first lumbar nerve .
It emerges from the lateral border of the Psoas major just below the iliohypogastric , and, passing obliquely across the Quadratus lumborum and Iliacus , perforates the Transversus abdominis , near the anterior part of the iliac crest , and communicates with the iliohypogastric nerve between the Transversus and the Obliquus internus .
The nerve then pierces the Obliquus internus, distributing filaments to it, and, accompanying the spermatic cord through the subcutaneous inguinal ring , is distributed to the skin of the upper and medial part of the thigh , to the skin over the root of the penis and upper part of the scrotum in the male, and to the skin covering the mons pubis and labium majus in the female.
The size of this nerve is in inverse proportion to that of the iliohypogastric.
Occasionally it is very small, and ends by joining the iliohypogastric; in such cases, a branch from the iliohypogastric takes the place of the ilioinguinal, or the latter nerve may be altogether absent.
External links
Major nerve s (also see Peripheral nervous system )
Cranial nerves I olfactory | II optic | III oculomotor | IV trochlear | V trigeminal | V1 ophthalmic (lacrimal , frontal , supratrochlear , supraorbital , nasociliary , ciliary ganglion ) | V2 maxillary (sphenopalatine ganglion ) | V3 mandibular (buccal - auriculotemporal - lingual - inferior alveolar - otic ganglion ) | VI abducens | VII facial (chorda tympani , nervus intermedius ) | VIII vestibulocochlear (cochlear , vestibular ) | IX glossopharyngeal | X vagus (recurrent laryngeal , Alderman's nerve ) | XI accessory | XII hypoglossal
Posterior spinal nerve s:greater occipital
C1-C4 - Cervical plexus : lesser occipital | greater auricular | lesser auricular | phrenic | ansa cervicalis
C5-C8, T1 - Brachial plexus : supraclavicular branches (dorsal scapular , suprascapular , long thoracic ) | lateral cord musculocutaneous , lateral antibrachial cutaneous , lateral head of median nerve ) | medial cord ulnar , medial head of median nerve , medial antibrachial cutaneous , medial brachial cutaneous ) | posterior cord axillary , radial )
T2-T11: intercostal
T12, L1-L5 - Lumbar plexus : iliohypogastric | ilioinguinal | genitofemoral | lateral femoral cutaneous | femoral | obturator
S1-S4 - Sacral plexus : gluteal | posterior femoral cutaneous | tibial | sciatic | sural | common peroneal
S2-S5 - Pudendal plexus : perforating cutaneous | pudendal | visceral | muscular | anococcygeal
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