Anatomical Course of Digital Nerves and Arteries in the Toe
The digital nerves and arteries of the toe run along the medial and lateral sides of each digit in neurovascular bundles, with the arteries (proper digital arteries) positioned plantar to the nerves, traveling from the plantar metatarsal arteries distally along the toe to supply the skin, joints, and soft tissues.
Arterial Anatomy
The arterial supply follows a predictable pattern from proximal to distal:
Plantar Digital Arteries (Primary Supply)
- The proper digital arteries are the dominant blood supply to the toes, arising from the plantar metatarsal arteries 1
- These arteries measure 0.93 to 1.37 cm in length as proper digital vessels 1
- The medial proper digital arteries are larger (1.2-1.26 mm diameter) compared to lateral proper digital arteries (0.66-0.99 mm diameter) 1
- An additional 2.3 to 2.83 cm of pedicle length can be obtained by including the plantar metatarsal arteries if needed 1
Dorsal Digital Arteries (Minimal Contribution)
- The dorsal metatarsal arteries produce small or absent dorsal digital arteries in 72.5% of cases 1
- When present, the medial dorsal digital artery can supply the proximal interphalangeal (PIP) joint, capsule, ligaments, and adjacent bone 2
- The dorsal arterial contribution is generally insufficient as a primary blood supply
Vascular Architecture
- The proper digital arteries supply the PIP joints through a system of transverse and longitudinal arches 1
- There are seven distinct patterns of arterial supply documented in the first web space, with significant anatomical variation 3
Neural Anatomy
The digital nerves accompany the arteries in neurovascular bundles:
Common and Proper Digital Nerves
- Digital nerves provide sensory innervation to the toes for tactile sensation and proprioception 4
- The nerves run alongside the arteries in the medial and lateral aspects of each toe 5
- The dorsomedial cutaneous nerve supplies the medial aspect of the great toe, branching from the medial dorsal cutaneous nerve (itself from the superficial peroneal nerve) 6
Anatomical Relationships
- The neurovascular bundles travel in the subcutaneous tissue along the sides of each digit
- Nerves are positioned slightly dorsal to their accompanying arteries within the bundle 5
Clinical Pitfalls
Imaging Challenges
- Digital nerves and arteries are difficult to distinguish from each other on MRI due to their small caliber and similar appearance 5, 4
- High-frequency ultrasound is superior for differentiating nerves from adjacent vasculature 5
- The small size and distal location make imaging technically demanding, requiring optimized protocols 4
Surgical Considerations
- The medial proper digital artery is the main blood supply and must be preserved during procedures 1
- Injury to digital nerves during surgery can result in painful neuromas, sensory deficits, and neuropathic pain 6, 4
- Anatomical variations are common—preoperative imaging cannot reliably predict the exact arterial pattern 3