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Dorsal carpal branch of radial artery

The dorsal carpal branch of the radial artery is a small but vital vessel that arises from the radial artery near the distal end of the radius, just before the artery curves dorsally around the wrist. It contributes significantly to the dorsal carpal network, which provides collateral circulation to the wrist and hand.

This artery participates in the formation of the dorsal carpal arch, an important vascular structure that supplies the dorsal aspect of the carpal bones, intercarpal joints, and adjacent tendons. Its anastomoses ensure adequate blood supply to the dorsal hand and serve as collateral routes during arterial occlusions of the forearm or hand.

Synonyms

  • Dorsal wrist branch of the radial artery

  • Dorsal carpal radial branch

Origin, Course, and Termination

Origin: Arises from the radial artery near the level of the radial styloid process, just before the artery winds dorsally around the wrist.
Course:

  • Passes medially across the dorsum of the wrist, deep to the extensor tendons of the thumb (extensor pollicis longus and brevis).

  • Runs transversely across the dorsal wrist, overlying the carpal bones and intercarpal ligaments.

  • Lies beneath the extensor retinaculum, joining vessels from the ulnar and anterior interosseous arteries.
    Termination: Forms the dorsal carpal arch, which gives off dorsal metacarpal arteries to the second, third, and fourth interspaces.

Relations

Anteriorly: Carpal bones and dorsal ligaments of the wrist
Posteriorly: Extensor tendons of thumb and fingers
Laterally: Radial styloid process and tendons of abductor pollicis longus and extensor pollicis brevis
Medially: Anastomoses with the dorsal carpal branch of the ulnar artery and perforating branches of the anterior interosseous artery

Branches

  • Articular branches: Supply the carpal bones and wrist joint capsule

  • Anastomotic branches: Contribute to the dorsal carpal arch

  • Dorsal metacarpal arteries: Arise from the dorsal carpal arch and continue distally to supply the metacarpal spaces

Function

  • Arterial supply: Provides oxygenated blood to the dorsal wrist, carpal bones, and extensor tendons

  • Collateral circulation: Forms part of the dorsal carpal anastomotic network, ensuring continuous perfusion to the hand

  • Support of tendon function: Supplies peritendinous tissue of extensor tendons

  • Clinical role: Maintains dorsal hand perfusion in cases of radial or ulnar artery compromise

Clinical Significance

  • Collateral importance: Key contributor to the dorsal carpal arch, maintaining blood flow to the wrist during arterial compression or trauma

  • Vascular injury: Can be damaged in dorsal wrist lacerations or fractures of the distal radius

  • Aneurysm formation: Rare, may present as a pulsatile swelling on dorsal wrist

  • Surgical relevance: Important consideration in wrist flap surgeries and radial artery harvesting

  • Arterial variations: May arise higher or lower on the radial artery, or be duplicated, affecting surgical and imaging interpretation

MRI Appearance

T1-weighted images:

  • Appears as a flow void (dark linear structure) due to fast-moving blood

  • Surrounding fat: bright, providing good contrast with vessel walls

  • Thrombosis or slow flow: may appear intermediate or hyperintense within the lumen

T2-weighted images:

  • Normal flowing blood: dark flow void

  • Vessel wall: thin, low signal line

  • Thrombus or wall thickening: intermediate-to-bright depending on stage and composition

  • Surrounding edema or hematoma: bright hyperintense signal

STIR:

  • Normal vessel: dark

  • Inflammation or perivascular edema: bright hyperintense signal

  • Useful for evaluating traumatic or inflammatory vascular changes

Proton Density Fat-Saturated (PD FS):

  • Artery: dark, linear flow void

  • Thrombosis or inflammation: bright signal along the vessel wall

  • Excellent for identifying perivascular soft-tissue changes

T1 Fat-Sat Post-Contrast:

  • Normal artery: brisk, homogeneous enhancement

  • Stenosis or occlusion: focal non-enhancing segment

  • Aneurysm or vascular inflammation: irregular or concentric wall enhancement

MRA (Magnetic Resonance Angiography) Appearance

Normal:

  • Appears as a small, enhancing branch from the distal radial artery coursing medially over the dorsal wrist

  • Best seen on 3D contrast-enhanced MRA or time-of-flight (TOF) sequences
    Pathology:

  • Occlusion: abrupt loss of vascular signal

  • Aneurysm: focal bulbous dilation with bright enhancement

  • Collateral flow: visualized as fine serpentine enhancing channels over dorsal wrist in chronic occlusion

CT Appearance

Non-Contrast CT:

  • Vessel not directly visible unless calcified

  • Arterial calcification appears as fine linear hyperdense lines along the dorsal wrist

  • Provides anatomic context with clear visualization of bones and tendons

Post-Contrast CT (standard):

  • Artery enhances as a fine tubular structure traversing the dorsal carpus

  • Differentiated from veins by timing of enhancement and caliber

  • Useful for identifying aneurysm, vessel wall irregularity, or hematoma

CTA (CT Angiography) Appearance

Normal:

  • The artery appears as a contrast-filled slender branch from the radial artery near the wrist, running horizontally across the dorsal carpus to form the dorsal carpal arch

  • Clearly depicted on arterial-phase CTA with thin-slice 3D reconstructions
    Pathology:

  • Stenosis or occlusion: abrupt cutoff or tapering of contrast column

  • Aneurysm: focal saccular or fusiform enhancement

  • Trauma: irregularity or extravasation of contrast indicating vascular injury

  • Collateral network: visible as multiple fine enhancing channels between radial and ulnar dorsal carpal branches

MRI images

dorsal carpal branch of the radial artery axial cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000

MRI images

dorsal carpal branch of the radial artery axial cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000_00001

MRI images

dorsal carpal branch of the radial artery axial cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000_00002

MRI images

dorsal carpal branch of the radial artery coronal cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000

MRI images

dorsal carpal branch of the radial artery coronal cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000_00001

MRI images

dorsal carpal branch of the radial artery sag cross sectional anatomy 3T MRI AI enhanced radiology image-img-00000-00000