Lesson 1Path of Radial Nerve in Armpit and Upper Arm: Links to Armpit Blood Vessels, Upper Arm Bone Head, and Latissimus Dorsi MuscleIn this part, we track the radial nerve through the armpit and upper arm area, explaining its connections to the armpit artery, upper arm bone head, latissimus dorsi muscle, and nearby tissue layers, highlighting spots where it can get squeezed, injury dangers, and ways to access it during operations.
Relations to axillary artery and veinCourse around humeral head and neckRelations to latissimus dorsi and teres majorFascial tunnels and potential compression sitesSurgical approaches in the proximal armLesson 2Main Markers for Locating at Bedside and Operation Access: Outer Elbow Bump, Radial Bone Head, Twisting Channel, Supinator PassageThis part points out dependable outer and inner markers for finding the radial nerve and its offshoots, helping with patient checks at the bedside, sound wave scans, and operation access near the outer elbow bump, radial bone head, twisting channel, and supinator passage.
Palpation of lateral epicondyle and radial headLocating the spiral groove on the humerusIdentifying the supinator tunnel regionUltrasound landmarks for radial branchesSafe windows for surgical approachesLesson 3Key Tiny Tissue Structure: Outer Nerve Cover, Middle Nerve Cover, Inner Nerve Cover, Nerve Blood Supply and Effects on Injury and HealingWe explain the tiny structure of the radial nerve, covering the outer cover, middle cover, inner cover, and blood vessels inside, showing how these parts react to pulling, squeezing, and cutting, and how they affect healing, lump formation, and fixing methods.
Epineurial structure and surgical handlingPerineurium and fascicular organizationEndoneurial tubes and axonal supportVasa nervorum and ischemic vulnerabilityMicroanatomy and regeneration patternsLesson 4Arm Plexus Roots and Role in Radial Nerve (C5–T1): Back Cord Building and Body VariationsThis part looks at how roots from C5 to T1 build the back cord and radial nerve, noting space links in the neck and armpit, common body differences, and how these affect muscle weakness, feeling loss, and electrical test results.
C5–T1 root contributions to radial nerveTopography of trunks, divisions, and cordsPosterior cord formation and branching patternCommon root and cord anatomical variantsClinical impact of high or low root lesionsLesson 5Back Interosseous Nerve (PIN): Entry via Supinator (Frohse Arch), Muscle Branches to Forearm Straighteners, Usual Branch PatternHere we look closely at the back interosseous nerve, from passing through the supinator and Frohse arch to its muscle branches for forearm straighteners, describing usual and different branch patterns and their part in specific weaknesses and operation plans.
Entry beneath ECRB to supinatorArcade of Frohse anatomy and variantsIntramuscular course within supinatorMotor branches to wrist and finger extensorsPatterns in selective PIN palsiesLesson 6Twisting (Radial) Channel Structure: Spot Relative to Upper Arm Bone, Branches to Triceps and Anconeus, Blood Vessel LinksThis part studies the twisting channel part, describing its place on the back of the upper arm bone, links to triceps and anconeus branches, nearby blood structures, and why this area is at risk in breaks, trapping, and medical procedures.
Surface and radiographic localizationRelations to triceps and anconeus branchesContact with posterior humeral cortexRadial collateral and profunda brachii vesselsRisk zones in humeral shaft fracturesLesson 7Ending Muscle and Feeling Areas: Straightener Section Muscles, Triceps, Brachioradialis, Anconeus, Finger Straighteners, and Back Hand Feeling MapThis part maps the ending muscle and feeling areas, connecting each radial nerve branch to certain straightener muscles, triceps, brachioradialis, anconeus, and back hand skin zones, to aid exact bedside finding and electrical test reading.
Motor map of triceps and anconeusInnervation of wrist and finger extensorsBrachioradialis and ECRL innervation zonesDorsal hand and thumb sensory territoriesPatterns of overlap with median and ulnarLesson 8Common Body Variations Affecting Patient Signs: Early Split, Extra Branches, Changing Supply to Brachioradialis and ECUWe go over common radial nerve body variations, like early split, extra branches, and changing supply to brachioradialis and ECU, stressing how these change patient signs, nerve signal tests, and operation hopes.
High radial bifurcation patternsAccessory branches to triceps or brachialisVariable innervation of brachioradialisECU and ECRB innervation variantsImpact on EMG and nerve conduction testsLesson 9Split at Outer Elbow Bump/Elbow: Surface Feeling Branch and Deep Branch (Back Interosseous Nerve) Body DetailsWe check the radial nerve split near the outer elbow bump, comparing the surface feeling branch and deep muscle branch (PIN), their bundle setup, links to the radial bone head, and effects for trapping, shots, and operation release.
Anatomy at the lateral epicondyleBranching into superficial and deep branchesRelations to radial head and joint capsuleFascicular topography at the bifurcationEntrapment and iatrogenic injury risksLesson 10Forearm Path of Surface Branch: Under-Skin Route, Branches to Back of Hand and Thumb Side BoxThis part tracks the surface radial nerve along the forearm, detailing its under-skin path, tissue layers, branches to the back of the hand and thumb side box, and how this structure guides feeling tests, blocks, and operation cuts.
Course deep to brachioradialisTransition to subcutaneous positionBranches to dorsum of hand and fingersAnatomic snuffbox relations and branchesSites of Wartenberg syndrome compression
