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Proper palmar digital arteries (hand)

The proper palmar digital arteries are slender but vital arteries that supply the fingers, running along their lateral sides. They originate from the common palmar digital arteries, which arise from the superficial palmar arch, and continue distally along the phalanges to supply the skin, nail bed, digital pulps, and flexor tendons.

Each finger receives two proper palmar digital arteries, positioned on its medial and lateral aspects, while the thumb has specialized branches from the princeps pollicis artery. Their small caliber and superficial course make them important in digital ischemia, trauma assessment, flap planning, and high-resolution vascular imaging.

Synonyms

  • Proper digital arteries

  • Palmar digital branches

  • Volar digital arteries

Origin, Course, and Distribution

Origin:

  • Arise from the common palmar digital arteries, themselves branches of the superficial palmar arch.

Course:

  • Travel along the sides of the fingers, deep to the palmar aponeurosis and superficial transverse ligaments.

  • Accompany the proper palmar digital nerves along the lateral margins of each phalanx.

  • Remain superficial enough to supply skin, yet deep to remain protected along the fibrous sheath.

Distribution:

  • Supply the pulp, skin, nail bed, periosteum, distal phalanx, and interphalangeal joints.

  • Distal branches form terminal arcades in the fingertip pulp.

Relations

  • Anteriorly: Fibrous digital sheath and flexor tendon system

  • Posteriorly: Phalanges and periosteum

  • Medially/Laterally: Proper palmar digital nerves (running parallel)

  • Superficially: Palmar skin and subcutaneous tissue

  • Deeply: Lateral groove beside the flexor tendon sheath

Function

  • Provide arterial supply to the skin, pulp, nail bed, and phalangeal bones

  • Support fine tactile function by perfusing high–sensory density areas

  • Maintain thermoregulation through digital vascular networks

  • Crucial for healing capacity after fingertip injuries

MRI Appearance

T1-weighted images

  • Arteries appear as dark flow voids due to rapid blood movement.

  • Surrounding fat in the fingers appears bright, increasing visibility of the vessel path.

  • Cortical bone is low signal; digital soft tissues show intermediate signal.

T2-weighted images

  • Proper palmar digital arteries remain dark (flow void).

  • Slightly brighter background tissues improve contrast against the artery.

  • Venous structures may appear larger compared to arteries on T2.

STIR

  • Arteries: dark flow voids.

  • Fat suppression makes surrounding tissue darker, improving contrast.

  • Flexor tendon sheaths and synovial tissue show intermediate-to-dark signal.

T1 Fat-Saturated Post-Contrast

  • Arteries show strong, bright enhancement throughout their course.

  • Clear delineation of vessel continuity along phalanges.

  • Digital pulps enhance uniformly, highlighting terminal arcades.

  • CT Appearance

    Non-Contrast CT

  • Arteries are not directly visible unless calcified (rare in fingers).

  • Bony details of the phalanges clearly seen.

  • Post-Contrast CT

  • Proper palmar digital arteries appear as thin enhancing linear vessels along the sides of the fingers.

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  • Soft tissues appear uniform without distinct vascular definition.

MRI image

Proper palmar digital arteries MRI coronal image-img-00000-00000

MRI image

Proper palmar digital arteries MRI axial image-img-00000-00000