Anatomy

The brachial plexus (C5–T1) and the five terminal nerves it spawns, mapped to the fractures, dislocations, and birth injuries that classically damage them — with the wrist-drop, ape-hand, claw-hand, benediction, and waiter's-tip signs that boards love to test, and the proximal-vs-distal lesion levels that change the picture.

A board-focused walkthrough of the 12 cranial nerves — modality, brainstem nucleus, exit foramen, and the signature lesion for each — anchored by the classic reflex arcs, ocular-motor palsies, and deviation rules Step 1 loves to test.

A Step 1–focused walkthrough of the lumbosacral plexus that maps each lower-limb nerve to its roots, motor and sensory territory, classic injury mechanism, and signature deficit/gait, anchored by high-yield vignettes (foot drop, Trendelenburg, meralgia paresthetica) and a mechanism → nerve reverse-lookup. Two comparison tables and the genuine anatomy mnemonics (PED/TIP, \"sound side sags,\" NAVEL) tie it together.

A high-yield Step 1 neuroanatomy lesson mapping the Circle of Willis and the ACA/MCA/PCA plus vertebrobasilar territories directly onto the deficits the boards test — cortical stroke patterns, brainstem syndromes, and the aneurysm/hemorrhage correlations. Built around the rule that knowing which artery feeds which cortex lets you predict every lesion.

A board-focused walkthrough of the three tested spinal cord tracts — dorsal columns, spinothalamic, and lateral corticospinal — anchored on where each decussates, then applied to the classic cord lesions (Brown-Séquard, syringomyelia, anterior spinal artery infarct, subacute combined degeneration, Friedreich ataxia, tabes dorsalis, and ALS).

A board-focused walk through the inguinal canal — its MALT walls, deep/superficial rings, and spermatic-cord coverings — building to the point exams test hardest: separating indirect, direct, and femoral hernias by their relation to the inferior epigastric vessels and the pubic tubercle, then covering the nerve injuries of hernia repair, the cremasteric reflex, and gonadal (para-aortic) vs scrotal (inguinal) lymphatic drainage.

A high-yield Step 1 anatomy lesson organizing the entire GI tract by its embryologic blood supply — foregut/celiac, midgut/SMA, hindgut/IMA — and deriving innervation, referred-pain maps, collateral/watershed circulation, and the classic ischemic, compression, and rotational-anomaly vignettes from that single scheme.

A Step 1 high-yield tour of cardiac anatomy — chamber/surface relations, coronary artery territories with their MI/ECG correlations, nodal blood supply and venous drainage, and pericardial anatomy — anchored to the injury and vignette patterns the boards actually test.