Lumbosacral trunk

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Nerve: Lumbosacral trunk
Plan of lumbar plexus.
Dissection of side wall of pelvis showing sacral and pudendal plexuses.
Latin	truncus lumbosacralis
Gray's	subject #212 948
From	L4-L5
Dorlands / Elsevier	t_20/12826064

The lumbosacral trunk is nervous tissue that connects the lumbar plexus with the sacral plexus.

[edit] Structure

The lumbosacral trunk comprises the whole of the anterior division of the fifth and a part of that of the fourth lumbar nerve; it appears at the medial margin of the psoas major and runs downward over the pelvic brim to join the first sacral nerve.

The anterior division of the third sacral nerve divides into an upper and a lower branch, the former entering the sacral plexus and the latter the pudendal plexus.

[edit] External links

• SUNY Labs 43:15-0103 - "The Female Pelvis: The Posterolateral Pelvic Wall"
• Anatomy at MUN nerve/lumbnerv
• Norman/Georgetown posteriorabdomen
• Human anatomy at Dartmouth figures/chapter_30/30-6.HTM

v • d • e Nerves: spinal nerves Cervical (8) C1, C2, C3, C4, C5, C6, C7, C8 anterior (Cervical plexus, Brachial plexus) - posterior (Posterior branches of cervical nerves, Suboccipital - C1, Greater occipital - C2, Third occipital - C3) Thoracic (12) T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 anterior (Intercostal, Intercostobrachial - T2, Thoraco-abdominal nerves - T7-T11, Subcostal - T12) - posterior (Posterior branches of thoracic nerves) Lumbar (5) L1, L2, L3, L4, L5 anterior (Lumbar plexus, Lumbosacral trunk) - posterior (Posterior branches of the lumbar nerves, Superior cluneal L1-L3) Sacral (5) S1, S2, S3, S4, S5 anterior (Sacral plexus) - posterior (Posterior branches of sacral nerves, Medial cluneal nerves) Coccygeal (1) anterior (Coccygeal plexus) - posterior (Posterior branch of coccygeal nerve)