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The last lumbar vertebra and the sacrum seen from the ventral side.

The Last Lumbar Verebra and the Sacrum

The last lumbar vertebra and the sacrum seen from the ventral side.

Right lumbar and sacral plexuses, schematic, viewed from in front The darkly shaded trunks are derivatives of the dorsal half of the plexus.

Lumbar and Sacral Nerve Plexuses

Right lumbar and sacral plexuses, schematic, viewed from in front The darkly shaded trunks are derivatives…

Sacral and pelvic ligaments-left lateral aspect. Labels: a, superior sacro-iliac ligament; b, sacral ligament; c, lateral sacro-iliac ligament; d. sacro-sciatic ligament.

Sacral and Pelvic Ligaments

Sacral and pelvic ligaments-left lateral aspect. Labels: a, superior sacro-iliac ligament; b, sacral…

Sacral and pelvic ligaments-inferior aspect. Labels: a, intertransverse lumbar ligament; b and c, capsular ligaments of lumbar and sacro-lumbar transverse articulation; d, inferior sacro-iliac ligament; e, obturator ligament; f, ligament of the ischio-pubic symphysis.

Sacral and Pelvic Ligaments

Sacral and pelvic ligaments-inferior aspect. Labels: a, intertransverse lumbar ligament; b and c, capsular…

A large, triangular bone at the base of the vertebral column at the upper and back part of the pelvic cavity.

Sacrum

A large, triangular bone at the base of the vertebral column at the upper and back part of the pelvic…

The vertebrae of the sacrum.

The Sacrum

The vertebrae of the sacrum.

"Showing the distribution of some of the great plexuses of the sympathetic nerve in the lumbar and sacral regions." — Blaisedell, 1904

Plexuses of the Sympathetic Nerves

"Showing the distribution of some of the great plexuses of the sympathetic nerve in the lumbar and sacral…