Anatomy Atlas

Vertebral venous plexus

Plexus venosi vertebrales
Also: Batson plexus
VeinHigh-yielddraftCardio

Valveless network of veins inside and around the vertebral column that connects the pelvic, abdominal, thoracic and intracranial veins. It explains how prostate and breast cancer spread to the spine.

Core anatomy

Location

Internal plexus in the epidural space; external plexus around the outside of the vertebrae.

Formation

Basivertebral veins from the vertebral bodies, spinal veins, and segmental veins.

Course

Extends from the sacrum to the skull, communicating with the dural venous sinuses through the foramen magnum.

Tributaries
  • Basivertebral veins (from the vertebral bodies)
  • Veins of the spinal cord
  • Intervertebral veins
Drains into

Intervertebral veins → vertebral, posterior intercostal (azygos vein system), lumbar and lateral sacral veins → caval systems.

Relations

The internal plexus lies in the epidural fat within the epidural space.

Notes

The plexus has no functional valves, so flow can reverse with changes in intra-abdominal or intrathoracic pressure (coughing, straining, Valsalva). It provides a route that bypasses the lungs and liver.

Mentioned in

Generated automatically from links in other entries.

Vertebral venous plexusPanel A is a cross-section through a lumbar vertebra, oriented as on axial CT. Basivertebral veins drain the vertebral body backward into the anterior internal vertebral venous plexus, which lies in the epidural space on the back of the body beside the posterior longitudinal ligament. A posterior internal plexus lies in front of the laminae. External plexuses lie in front of the vertebral body and around the laminae and spinous process. Intervertebral veins leave through the intervertebral foramina to the lumbar veins, which drain to the inferior vena cava. Panel B shows the plexus as a valveless channel from the skull to the pelvis, connected to the dural venous sinuses, vertebral veins, posterior intercostal veins and azygos system, lumbar veins and inferior vena cava, and pelvic veins including the prostatic plexus. Flow can reverse with coughing or straining, so tumor cells and bacteria from the pelvis can reach the spine without passing through the lungs or liver.A · Lumbar cross-sectionIVCAortaAnterior external plexusBasivertebral veins(from the vertebral body)Anterior internal plexus(epidural, beside the PLL)Dural sac(cauda equina)Posterior internal plexusPosterior external plexusLumbar vein→ IVCIntervertebral vein(via the foramen)Epidural fatSpinous processViewed from below as on axial CT/MRI · anterior ↑ ·patient's right on the viewer's left · not to scaleB · Valveless connectionsSkullNeckThoraxAbdomenPelvisDural venous sinuses (via foramen magnum)Vertebral veinsPosterior intercostal veins → azygosLumbar veins → IVCPelvic veins (prostatic, lateral sacral)↑ prostate cancer → lumbar spineNo valves: coughing or straining can reverse flow,so tumor cells or bacteria reach the spine (and eventhe brain) without passing through the lungs or liver.

Swipe sideways to see the whole diagram →

Vertebral venous plexus (Batson). A: lumbar cross-section, oriented as on axial CT. The internal plexus lies in the epidural space; the external plexus lies outside the vertebra. B: the plexus is a valveless channel from the skull to the pelvis, which is why pelvic tumors (classically prostate) and infections can reach the vertebrae.
Original schematic, created for this atlas.

Clinical correlations

Vertebral metastases PANCE

Mechanism / lesion

Tumor cells from the pelvis and trunk (classically prostate, also breast, lung, kidney) travel through the valveless plexus to the vertebral bodies and even the brain without passing through the lungs.

Classic presentation

Back pain from spinal metastases; prostate cancer metastases to the lumbar spine and pelvis are typically osteoblastic (sclerotic). Risk of spinal cord compression.

Spread of infection

Mechanism / lesion

Pelvic or urinary infections can seed the vertebrae and disc through the plexus (vertebral osteomyelitis/discitis).

Classic presentation

Back pain, fever and elevated inflammatory markers; MRI shows discitis/osteomyelitis.

Epidural bleeding

Mechanism / lesion

The thin-walled internal plexus can bleed during epidural catheter placement, especially with anticoagulation.

Classic presentation

Blood in the epidural needle or catheter; rarely a spinal epidural hematoma with cord compression.

High-yield PANCE pearls

  • Batson plexus (valveless) → prostate cancer metastases to the lumbar spine (osteoblastic).
  • Pathway bypasses the lungs, allowing spread from pelvis to spine and brain.

Imaging anatomy

X-ray

Osteoblastic (sclerotic, dense) lesions in prostate cancer; osteolytic lesions in many other cancers.

CT

Characterizes blastic vs lytic lesions and fracture risk.

MRI

Most sensitive for marrow metastases and epidural extension.

Key views & landmarks
  • Bone scan or PET (e.g. PSMA PET in prostate cancer) for skeletal staging

Physical exam

Strength / function testing

Percussion tenderness over the spine; neurologic exam for cord compression; digital rectal exam in men with new spinal lesions of unknown primary.

Self-quiz

Q1.

A 70-year-old man has low back pain. Radiographs show multiple sclerotic lesions in the lumbar vertebrae and pelvis. Through which route did the tumor most likely spread?

Show answer

B

Prostate cancer spreads to the lumbar spine and pelvis through the valveless vertebral venous plexus, producing osteoblastic lesions.

Q2.

Which feature of the vertebral venous plexus allows retrograde spread of tumor cells?

Show answer

B

The plexus is valveless, so rises in intra-abdominal pressure can reverse flow toward the vertebrae and cranium.

Q3.

Osteoblastic vertebral metastases in a man are most characteristic of which primary cancer?

Show answer

B

Prostate cancer classically produces osteoblastic (sclerotic) metastases; renal, thyroid and myeloma lesions are typically lytic.

Q4.

Which veins drain the vertebral bodies into the internal vertebral venous plexus?

Show answer

D

The basivertebral veins drain the vertebral bodies backward into the internal (epidural) plexus. The intervertebral veins then carry blood out to the posterior intercostal (azygos), lumbar and lateral sacral veins.

Q5.

Superiorly, the vertebral venous plexus communicates with which veins?

Show answer

A

The plexus extends from the sacrum to the skull and connects with the dural venous sinuses through the foramen magnum. Because it is valveless, tumor cells can reach the spine and brain without passing through the lungs.

Flashcards

See also