ANATOMY MOST IMPORTANT MUST-KNOW POINTS (10 MIN REVISION)
1️⃣ General Anatomy & Embryology
• Anatomical position → Supine? ❌ Standing, palms facing forward
• Median plane → Divides body into equal right & left halves
• Superficial fascia → Contains fat, cutaneous nerves & vessels
• Deep fascia → Encloses muscles and forms intermuscular septa
• Tendon → Muscle → bone attachment
• Ligament → Bone → bone attachment ⭐
• Dermatomes → Skin supplied by a single spinal nerve
• Myotome → Muscles supplied by a single spinal nerve
• Sclerotome → Vertebral body + intervertebral disc
• Neural crest → PNS ganglia, Schwann cells, melanocytes, adrenal medulla ⭐
• Notochord → Nucleus pulposus of intervertebral disc
• Somites → Sclerotome + myotome + dermatome
• 1st pharyngeal arch → Mandible, muscles of mastication, CN V3
• 2nd arch → Muscles of facial expression, CN VII
• 3rd arch → Stylopharyngeus, CN IX
• 4th & 6th arches → Pharyngeal/laryngeal muscles, CN X ⭐
• Meckel cartilage → 1st arch cartilage
• Reichert cartilage → 2nd arch cartilage
2️⃣ Upper Limb
• Brachial plexus → C5–T1 ⭐
• Roots → Trunks → Divisions → Cords → Branches
• Erb palsy → C5–C6 → Waiter's tip deformity ⭐
• Klumpke palsy → C8–T1 → Claw hand
• Long thoracic nerve → Serratus anterior → Winged scapula
• Axillary nerve → Deltoid + teres minor; surgical neck of humerus
• Radial nerve → Extensors of arm/forearm; spiral groove ⭐
• Median nerve → Most forearm flexors + thenar muscles
• Ulnar nerve → Interossei + adductor pollicis
• Ulnar nerve injury → Clawing of 4th & 5th fingers
• Anatomical snuffbox → Scaphoid forms floor; radial artery passes through ⭐
• Scaphoid → Most commonly fractured carpal bone
• Lunate → Most commonly dislocated carpal bone
• Carpal tunnel → Median nerve + 9 flexor tendons ⭐
• Biceps → Musculocutaneous nerve
• Triceps → Radial nerve
• Deltoid → Axillary nerve
• Ape thumb → Median nerve injury
• Froment sign → Ulnar nerve palsy
3️⃣ Lower Limb
• Femoral nerve → Anterior compartment of thigh
• Obturator nerve → Medial compartment of thigh
• Sciatic nerve → Posterior thigh + most muscles below knee ⭐
• Common peroneal nerve → Winds around neck of fibula ⭐
• Common peroneal injury → Foot drop
• Tibial nerve → Posterior compartment of leg
• Deep peroneal nerve → Anterior compartment of leg
• Superficial peroneal nerve → Lateral compartment of leg
• Trendelenburg sign → Superior gluteal nerve injury
• Gluteus maximus → Inferior gluteal nerve
• Gluteus medius/minimus → Superior gluteal nerve
• Femoral triangle → NAVEL from lateral → medial ⭐
• Femoral sheath → Femoral artery, vein & canal
• Adductor canal → Femoral vessels + saphenous nerve
• Great saphenous vein → Passes anterior to medial malleolus
• Small saphenous vein → Passes posterior to lateral malleolus
• ACL → Prevents anterior displacement of tibia ⭐
• PCL → Prevents posterior displacement of tibia
• Medial meniscus → More commonly injured; attached to MCL
• Q-angle → Increased in genu valgum
4️⃣ Thorax
• Intercostal nerves → Anterior rami of T1–T11
• VAN → Vein, artery, nerve in costal groove ⭐
• Intercostal neurovascular bundle → Between internal & innermost intercostal muscles
• Internal thoracic artery → Branch of subclavian artery
• Phrenic nerve → C3, C4, C5 → diaphragm ⭐
• Vagus nerve → Parasympathetic supply to thoracic viscera
• Right recurrent laryngeal nerve → Loops around right subclavian artery
• Left recurrent laryngeal nerve → Loops under arch of aorta ⭐
• Diaphragm openings → T8 IVC, T10 esophagus, T12 aorta
• Coronary arteries → Branches of ascending aorta
• SA node → Usually supplied by RCA
• AV node → Usually supplied by RCA
• LAD → Anterior interventricular septum + anterior LV
• RCA → Right heart + inferior wall
• Mitral valve → Left atrium → left ventricle
• Tricuspid valve → Right atrium → right ventricle
5️⃣ Abdomen
• Celiac trunk → Foregut ⭐
• Superior mesenteric artery → Midgut
• Inferior mesenteric artery → Hindgut
• Foregut → Up to proximal 2/3 duodenum
• Midgut → Distal 1/3 duodenum to proximal 2/3 transverse colon
• Hindgut → Distal 1/3 transverse colon to upper anal canal
• Portal vein → Splenic vein + SMV
• Portal triad → Portal vein + hepatic artery + bile duct ⭐
• Pringle maneuver → Compresses portal triad
• Bare area of liver → Not covered by peritoneum
• Calot triangle → Cystic duct, common hepatic duct, cystic artery
• McBurney point → 1/3 from ASIS to umbilicus
• Appendix → Base at convergence of taeniae coli ⭐
• Meckel diverticulum → Rule of 2s
• SMA → Midgut blood supply
• IMV → Usually drains into splenic vein
• Kidney → Retroperitoneal except? → All retroperitoneal except kidneys are retroperitoneal; spleen is intraperitoneal
• Right kidney → Lower than left
• Left renal vein → Passes anterior to aorta
6️⃣ Pelvis & Perineum
• Pudendal nerve → S2–S4 ⭐
• Pudendal nerve → Main somatic nerve of perineum
• Ischioanal fossa → Fat-filled space beside anal canal
• Internal pudendal artery → Branch of internal iliac artery
• Pelvic diaphragm → Levator ani + coccygeus
• Levator ani → Puborectalis, pubococcygeus, iliococcygeus
• Puborectalis → Maintains anorectal angle ⭐
• Ureter → Passes under uterine artery in females → “Water under the bridge”
• Ureter → Passes under ductus deferens in males
• Broad ligament → Double layer of peritoneum
• Cardinal ligament → Major support of uterus
• Prostate → Inferior to bladder, surrounds prostatic urethra
• Internal iliac artery → Main artery of pelvis
7️⃣ Head & Neck
• Facial nerve → Muscles of facial expression ⭐
• Trigeminal nerve → Main sensory nerve of face
• V1 → Ophthalmic
• V2 → Maxillary
• V3 → Mandibular + motor to muscles of mastication
• Cavernous sinus → Contains CN III, IV, V1, V2 & VI ⭐
• CN VI → Most vulnerable nerve in cavernous sinus
• Optic nerve → CN II
• Parasympathetic to pupil → CN III
• Facial artery → Crosses mandible anterior to masseter
• External carotid branches → SALFOPM
• Internal carotid → No branches in neck
• Thyroid gland → Supplied mainly by superior & inferior thyroid arteries
• Recurrent laryngeal nerve → Motor supply to all intrinsic laryngeal muscles except cricothyroid ⭐
• External laryngeal nerve → Cricothyroid muscle
• Cricothyroid → Tenses vocal cords
• Vocal cord → Recurrent laryngeal nerve
• Tongue anterior 2/3 sensation → V3
• Taste anterior 2/3 → CN VII
• Posterior 1/3 sensation + taste → CN IX
• Motor tongue → CN XII except palatoglossus → CN X
8️⃣ Neuroanatomy
• UMN lesion → Spasticity, hyperreflexia, Babinski ⭐
• LMN lesion → Flaccidity, fasciculations, hyporeflexia
• Internal capsule → Major compact pathway for motor fibers
• MCA → Lateral cerebral hemisphere
• ACA → Medial frontal/parietal cortex
• PCA → Occipital lobe ⭐
• Broca area → Motor speech
• Wernicke area → Language comprehension
• Hippocampus → Memory consolidation
• Amygdala → Fear/emotional processing
• Basal ganglia → Movement regulation
• Substantia nigra → Dopamine
• Subthalamic nucleus lesion → Hemiballismus
• Cerebellar lesion → Ipsilateral ataxia
• Medial medullary syndrome → Pyramid + medial lemniscus + hypoglossal
• Lateral medullary syndrome → PICA → Wallenberg syndrome ⭐
• Anterior spinal artery → Supplies anterior 2/3 of spinal cord
• Dorsal columns → Fine touch, vibration, proprioception
• Spinothalamic tract → Pain & temperature
9️⃣ Cranial Nerves — MUST KNOW
• CN I → Smell
• CN II → Vision
• CN III → Most eye movements + pupil constriction
• CN IV → Superior oblique
• CN V → Facial sensation + mastication
• CN VI → Lateral rectus
• CN VII → Facial expression + taste anterior 2/3
• CN VIII → Hearing + balance
• CN IX → Taste posterior 1/3 + stylopharyngeus
• CN X → Palate, pharynx, larynx ⭐
• CN XI → SCM + trapezius
• CN XII → Tongue movements
• LR6 SO4 → Lateral rectus CN VI, superior oblique CN IV
• All other extraocular muscles → CN III ⭐
• Parasympathetic ganglia → Ciliary, pterygopalatine, submandibular, otic
• Gag afferent → CN IX
• Gag efferent → CN X
🔟 Histology & Applied Anatomy
• Hyaline cartilage → Most common cartilage
• Elastic cartilage → Pinna, epiglottis
• Fibrocartilage → Intervertebral disc, pubic symphysis ⭐
• Type I collagen → Bone, tendon, skin
• Type II collagen → Cartilage
• Type III collagen → Reticulin fibers
• Type IV collagen → Basement membrane
• Skeletal muscle → Peripheral nuclei
• Cardiac muscle → Central nuclei + intercalated discs
• Smooth muscle → Single central nucleus, no striations
• Liver → Classical lobule centered on central vein
• Kidney → Cortex contains glomeruli; medulla does not ⭐
• Thyroid → Follicles filled with colloid
• Parathyroid → Chief cells + oxyphil cells
• Lymph node → Cortex = B cells; paracortex = T cells
• Spleen → White pulp = lymphoid; red pulp = blood filtration
• Hassall corpuscles → Thymic medulla ⭐
• Pacinian corpuscles → Deep pressure/vibration
• Meissner corpuscles → Fine touch
• Merkel cells → Light touch
• Ruffini endings → Skin stretch
🔥 LAST-MINUTE ANATOMY PEARLS
• Surgical neck of humerus → Axillary nerve
• Neck of fibula → Common peroneal nerve
• Midshaft humerus → Radial nerve
• Medial epicondyle → Ulnar nerve
• Carpal tunnel → Median nerve
• Guyon's canal → Ulnar nerve
• Tarsal tunnel → Tibial nerve
• Anatomical snuffbox → Scaphoid + radial artery
• Fracture of surgical neck → Axillary nerve ⭐
• Fracture of midshaft humerus → Radial nerve
• Fracture of neck of fibula → Common peroneal nerve
• Posterior dislocation of hip → Sciatic nerve risk
• Epidural hematoma → Middle meningeal artery
• Subdural hematoma → Bridging veins
• Subarachnoid hemorrhage → Circle of Willis aneurysm
• Berry aneurysm → Common cause of SAH
• Pterion fracture → Middle meningeal artery ⭐
• Uncal herniation → CN III compression → Dilated pupil
• Tonsillar herniation → Medulla compression → Respiratory arrest
📌 Save this for your last 10-minute Anatomy revision before NEET PG.
All the best 💫🩺