U01.11.012 Neurovascular pairing

Written by

Learning Objectives

Identify the neurovascular pairs that do not follow standard naming conventions.
Correlate specific bone landmarks (humerus, malleolus) with their adjacent nerves and vessels.
Predict clinical deficits based on the location of trauma (e.g., midshaft vs. surgical neck fractures).

The humerus is a classic “board favorite” because different fracture sites injure different pairs.

Location	Nerve	Artery
Axilla / Lateral Thorax	Long thoracic	Lateral thoracic
Surgical Neck of Humerus	Axillary	Posterior circumflex humeral
Midshaft of Humerus	Radial	Deep brachial (Profunda brachii)
Distal Humerus / Cubital Fossa	Median	Brachial

These pairs are critical for assessing peripheral pulses and nerve function following lower limb trauma or compartment syndrome.

Popliteal Fossa: The Tibial nerve and Popliteal artery run together. A baker cyst or knee dislocation can threaten both.
Posterior to the Medial Malleolus: The Tibial nerve and Posterior tibial artery pass through the tarsal tunnel here.
- Clinical: This is where you palpate the posterior tibial pulse. Compression here leads to Tarsal Tunnel Syndrome.

Clinical Notes & Corrections:

Mastectomy Risk: During axillary node dissection, the “lateral thoracic” pair (Long thoracic N. + Lateral thoracic A.) is at high risk. Damage to the nerve leads to a winged scapula.
The Profunda Brachii: In a midshaft humerus fracture, the Deep brachial artery is the vessel most likely to be damaged along with the radial nerve.
Supracondylar Fractures: In children, a supracondylar fracture of the distal humerus is a surgical emergency because it can compromise the Brachial artery and Median nerve.

Memory Hooks:

Surgical Neck: Axillary nerve is Around the neck.

Midshaft: Radial nerve stays in the Radial groove with the Deep Brachial (Radial=Deep).

Medial Malleolus: Tom, Dick, and Nervous Harry (Tibialis posterior, Flexor Digitorum longus, Artery, Nerve, Flexor Hallucis longus).