Lumbar intervertebral foramen anatomy

The anatomic perimeters on Kambin’s triangle (Kambin’s triangle outlined in red).

Superior and inferior corporotransverse ligament (L), inter-transverse ligament (asterisk).

Superior and inferior extraforaminal ligament (L).

(A) Schematic drawing of a lumbar artery and its branch in the extraforaminal
region. L: lumbar vertebra.

(B) Anastomotic branches originating from the middle trunk (L4) enters the L5-S1 intervertebral foramen. L5
spinal branch (black arrowhead) and the anastomotic branch (white arrowhead) and the anastomotic branch (white arrowhead) between L4 and L5. L4-5 Kambin’s triangle (black triangle).

Schematic drawing of the intervertebral foramen. The various intervertebral foraminal ligaments, intraforaminal ligaments, and nerve root and vessels: superior and inferior corporopedicular ligament (L); ligamentum flavum; superior, mid-, and inferior transforaminal ligament (L); intraforaminal ligament (L). NR, nerve root; A, artery; V, vein.

After the facets are removed, posterior schematic drawings of the lumbar artery and its branches in the intraforaminal area. (A) The spinal branch (white arrowhead) penetrates the sheath of the spinal nerve (SN).

After the facets are removed, posterior schematic drawings of the lumbar artery and its branches in the intraforaminal area.(B) The ganglionic branches (black arrowhead) are supplies to DRG. DRG, dorsal root ganglion; lumbar A, lumbar artery.

Exiting nerve root at the left L4.

Epiduroscopic view of ventral anatomical structures of the spinal dura.

Schematic drawing of the intraspinal canal
structures seen from endoscopic transforaminal (left L4–5) approach. PLL, posterior longitudinal ligament.

(A) Intraspinal canal ligaments and veins. Hoffmann ligaments (asterisk) at the ventral dura. meningovertebral ligaments (star) at the dorsal dura. (B) Intraspinal canal epidural veins. SN, spinal nerve; LF,
ligamentum flavum; PLL, posterior longitudinal ligament; V, vein.