Master Anatomy
for PMDC NLE Step 1

Core Concepts

Anatomy is the study of the body's structure. For PMDC NLE Step 1, prioritize clinically relevant gross anatomy, neuroanatomy, and basic embryology.

• General Anatomy:
  • Planes: Sagittal, Coronal, Transverse. Terms: Superior/Inferior, Anterior/Posterior, Medial/Lateral, Proximal/Distal.
  • Joints: Synovial (capsule, fluid, cartilage), Fibrous, Cartilaginous.
• Neuroanatomy (High-Yield):
  • Cranial Nerves (I-XII): Name, basic function, and classic deficits (e.g., CN VII: Bell's Palsy, CN X: uvula deviation).
  • Brain: Lobes (function), CSF flow, major cerebral arteries (Circle of Willis, MCA, ACA, PCA territories & stroke symptoms).
  • Spinal Cord: Major tracts (Corticospinal, Spinothalamic, Dorsal Column). Dermatomes & Myotomes. Cauda Equina Syndrome.
  • Autonomic NS: Sympathetic (thoracolumbar) vs. Parasympathetic (craniosacral).
• Cardiovascular System:
  • Heart: Chambers, valves, coronary arteries (LAD, RCA).
  • Major Vessels: Aorta branches, carotid, subclavian, femoral arteries. SVC, IVC, jugular, hepatic portal system.
  • Lymphatics: Key drainage areas (axillary, inguinal), thoracic duct termination.
• Respiratory System: Lungs (lobes, segments), pleura. Diaphragm (Phrenic nerve C3-C5).
• Gastrointestinal System:
  • Major organs. Blood Supply: Celiac trunk (foregut), SMA (midgut), IMA (hindgut).
  • Peritoneum: Omenta, Mesenteries. Common hernia sites (inguinal canal).
• Musculoskeletal System:
  • Upper Limb: Brachial plexus (Median, Ulnar, Radial nerve injuries), Rotator Cuff, Carpal Tunnel Syndrome.
  • Lower Limb: Femoral triangle. Sciatic nerve (Common Peroneal injury: foot drop). Knee ligaments (ACL, PCL).
  • Spine: Vertebral anatomy, intervertebral discs.

Clinical Presentation

• Nerve Injuries:
  • Radial: Wrist drop. Ulnar: Claw hand. Median: Ape hand. Common Peroneal: Foot drop. Phrenic: Diaphragmatic paralysis.
• Referred Pain: Diaphragm (shoulder tip), Appendicitis (periumbilical to RLQ).
• Hernias: Inguinal (direct/indirect), femoral.
• Cranial Nerve Lesions: Diplopia, ptosis, facial droop, dysphagia.
• Compartment Syndromes: Pain out of proportion, pallor, paresthesia, pulselessness, paralysis.

Diagnosis (Gold Standard)

Anatomical knowledge underpins physical examination and imaging interpretation.

• Physical Examination: Palpation (pulses, nodes, landmarks), Auscultation (heart, lung, bowel sounds), Neurological exam (CN, dermatomes, myotomes, reflexes).
• Imaging:
  • X-ray: Fractures, dislocations.
  • CT Scan: Detailed bone, acute hemorrhage, cross-sectional anatomy.
  • MRI: Soft tissue (brain, spinal cord, ligaments, tendons).
  • Ultrasound: Abdominal/pelvic organs, vascular flow.

Management (First Line)

Surgical and interventional management relies on precise anatomical understanding to ensure efficacy and prevent injury.

• Surgical Approaches: Knowledge of incision sites (e.g., McBurney's), anatomical layers, and vital structures.
• Vascular Access: Central Venous Catheters (Internal Jugular, Subclavian, Femoral Vein) – knowing landmarks and adjacent structures.
• Nerve Blocks: Precise needle placement guided by anatomical landmarks.

Exam Red Flags