I. THORAX
- Lungs in detail with suitable diagram ⭐
- Mediastinum & its applied ⭐
- Thoracic duct ⭐
- Root of lung ⭐
- Bronchopulmonary segments
- Aorta and its branches ⭐
- Right Atrium of Heart
- Coronary artery
- Portal Vein ⭐
- Conducting system of Heart
- Azygos vein and its tributaries
- Pericardium
1) Lungs ⭐
Definition
Paired respiratory organs present in thoracic cavity for exchange of gases.
Structure
• Apex above 1st rib • Base rests on diaphragm • Costal, Mediastinal, Diaphragmatic surfaces • Right – 3 lobes, oblique & horizontal fissure • Left – 2 lobes, oblique fissure, cardiac notch
Blood Supply
• Pulmonary artery – Deoxygenated blood • Pulmonary veins – Oxygenated blood • Bronchial arteries – Nutrition
Functions
• Oxygenation of blood • Removal of CO₂ • Acid-base balance
Applied
• Pneumonia • Pleural effusion • Pneumothorax
2) Mediastinum ⭐
Definition
Central space between two lungs containing vital thoracic organs.
Divisions
• Superior • Inferior – Anterior, Middle, Posterior
Main Contents
• Heart & pericardium • Great vessels • Trachea • Esophagus • Thoracic duct
Functions
• Protects vital structures • Passage for vessels & nerves
Applied
• Mediastinal mass • Widened mediastinum (trauma)
3) Thoracic Duct ⭐
Definition
Largest lymphatic channel of body.
Course
• Begins at cisterna chyli (L1–L2) • Enters thorax via aortic opening • Opens at left venous angle
Drainage
• Both lower limbs • Abdomen • Left thorax • Left upper limb • Left head & neck
Applied
• Chylothorax • Injury during thoracic surgery
4) Root of Lung ⭐
Definition
Short tubular structure connecting lung to mediastinum.
Contents
• Main bronchus • Pulmonary artery • Pulmonary veins • Bronchial vessels • Nerves & lymphatics
Arrangement
• Right – Bronchus above artery • Left – Artery above bronchus
Applied
• Lung carcinoma spread • Enlarged lymph nodes
5) Bronchopulmonary Segments
Definition
Anatomical and functional units of lung supplied by segmental bronchus.
Number
• Right – 10 • Left – 8–10
Features
• Pyramidal shape • Independent blood supply • Separated by connective tissue
Applied
• Segmentectomy possible • Localized infection
6) Aorta & Branches ⭐
Definition
Largest artery arising from left ventricle.
Parts
• Ascending aorta • Arch of aorta • Descending thoracic aorta
Major Branches
• Right & Left coronary • Brachiocephalic trunk • Left common carotid • Left subclavian • Posterior intercostal arteries
Applied
• Aortic aneurysm • Coarctation of aorta
7) Right Atrium
Definition
Right upper chamber receiving venous blood.
Openings
• Superior vena cava • Inferior vena cava • Coronary sinus
Internal Features
• Crista terminalis • Pectinate muscles • Fossa ovalis
Applied
• Atrial septal defect • Atrial enlargement
8) Coronary Artery
Definition
Arteries supplying myocardium.
Types
• Right coronary artery • Left coronary artery
Important Branches
• LAD (Anterior interventricular) • Circumflex • Right marginal
Applied
• Myocardial infarction • Angina
9) Portal Vein ⭐
Definition
Vein carrying nutrient-rich blood from GIT to liver.
Formation
• Superior mesenteric vein • Splenic vein
Tributaries
• Gastric veins • Cystic vein
Applied
• Portal hypertension • Esophageal varices • Caput medusae
10) Conducting System of Heart
Components
• SA node • AV node • Bundle of His • Right & Left bundle branches • Purkinje fibers
Function
• Initiates and conducts cardiac impulse • Maintains heart rhythm
Applied
• Heart block • Arrhythmia
11) Azygos Vein
Definition
Vein draining posterior thoracic wall.
Formation
• Right ascending lumbar vein • Right subcostal vein
Tributaries
• Posterior intercostal veins • Hemiazygos • Accessory hemiazygos
Applied
• Enlarged in SVC obstruction • Collateral circulation
12) Pericardium
Definition
Fibroserous sac enclosing heart.
Layers
• Fibrous pericardium • Serous – Parietal & Visceral
Functions
• Protects heart • Prevents overdistension • Fixes heart in position
Applied
• Pericarditis • Cardiac tamponade • Pericardial effusion
Here is the corrected and properly numbered list as per your request ("123 ashi numbering"):
III. ABDOMEN AND PELVIS
- Stomach—part, blood supply, nerve supply applied ⭐
- Liver in detail ⭐
- Pancreas in detail and Relations of head of Pancreas
- Vermiform appendix and its position
- Opening in the diaphragm
- Uterus with its applied
- Ligament of uterus ⭐
- Spleen with suitable diagram
- Kidney with diagram
- Pouch of Douglas ⭐
- Portal vein ⭐
- Stomach bed
- Greater Omentum ⭐
- Rectus sheath
- Mesentery
- Perineum ⭐
- Meckel's diverticulum
- Peritoneum—greater sac and lesser sac
- Blood supply of appendix
- Pudendal Nerve list they proper number
STOMACH ⭐
Location
• Epigastric + left hypochondrium • J-shaped organ between esophagus & duodenum
Parts
• Cardia – Esophageal opening • Fundus – Above cardiac level • Body – Main part • Pylorus – Opens into duodenum
Blood Supply
• Left gastric – From celiac trunk • Right gastric – From hepatic artery • Left gastroepiploic – From splenic • Right gastroepiploic – From gastroduodenal • Short gastric – From splenic
Nerve Supply
• Vagus – Increases motility & secretion • Sympathetic (celiac plexus) – Decreases activity
Functions
• Food storage • Mechanical churning • HCl & pepsin secretion • Begins protein digestion
Applied
• Peptic ulcer – Common in lesser curvature • Carcinoma – Spread via lymphatics • Pyloric stenosis – Projectile vomiting
LIVER ⭐
Location
• Right upper abdomen • Protected by ribs
Surfaces
• Diaphragmatic – Smooth • Visceral – Related to stomach, kidney, colon
Lobes
• Right – Largest • Left • Caudate • Quadrate
Blood Supply
• Hepatic artery – 20% oxygenated blood • Portal vein – 80% nutrient-rich blood
Venous Drainage
• Hepatic veins → IVC
Functions
• Bile production • Carbohydrate metabolism • Protein synthesis • Detoxification • Storage of glycogen, iron
Applied
• Cirrhosis – Fibrosis of liver • Hepatitis – Inflammation • Portal hypertension – Ascites, varices
PANCREAS ⭐
Situation
• Retroperitoneal organ • Lies behind stomach
Parts
• Head – In C-loop of duodenum • Neck • Body • Tail – Near spleen
Functions
• Exocrine – Trypsin, amylase, lipase • Endocrine – Insulin, glucagon
Relations of Head
• Posterior – IVC, bile duct • Anterior – Transverse colon • Medial – SMA & SMV • Lateral – Duodenum
Applied
• Acute pancreatitis – Severe epigastric pain • Carcinoma head – Obstructive jaundice
VERMIFORM APPENDIX ⭐
Length
• 8–10 cm narrow tube
Base
• At junction of 3 taenia coli
Positions
• Retrocecal – Most common • Pelvic • Subcecal • Pre-ileal • Post-ileal
Blood Supply
• Appendicular artery (end artery)
Applied
• Appendicitis – Periumbilical → Right iliac pain • Can rupture if untreated
OPENINGS IN DIAPHRAGM ⭐
T8
• IVC • Right phrenic nerve
T10
• Esophagus • Vagus nerves
T12
• Aorta • Thoracic duct • Azygos vein
Applied
• Hiatus hernia – Stomach protrudes into thorax
UTERUS ⭐
Situation
• Between bladder & rectum
Parts
• Fundus • Body • Cervix
Position
• Anteverted (tilted forward) • Anteflexed (bent forward)
Blood Supply
• Uterine artery (from internal iliac)
Functions
• Menstrual cycle • Fetal development • Labor contractions
Applied
• Prolapse – Weak support • Fibroid – Benign tumor • Carcinoma cervix
LIGAMENTS OF UTERUS ⭐
True Ligaments
• Transverse cervical – Main support • Uterosacral – Posterior support • Pubocervical – Anterior support
False Ligaments
• Broad ligament – Peritoneal fold • Round ligament – Maintains anteversion
Applied
• Weak ligaments → Uterine prolapse
SPLEEN ⭐
Location
• Left hypochondrium • Between 9th–11th ribs • Intraperitoneal organ
Features
• 2 surfaces – Diaphragmatic, Visceral • 2 poles – Anterior, Posterior • 2 borders – Superior (notched), Inferior
Relations
• Stomach • Left kidney • Colon • Tail of pancreas
Blood Supply
• Splenic artery (from celiac trunk) • Splenic vein → Portal vein
Functions
• RBC destruction • Immune response • Blood reservoir
Applied
• Splenomegaly • Rupture → Internal bleeding
KIDNEY ⭐
Location
• Retroperitoneal • T12–L3 level • Right slightly lower
External Features
• Upper & lower pole • Medial border – Hilum • Lateral border – Convex
Hilum (Anterior → Posterior)
• Renal vein • Renal artery • Renal pelvis
Internal Structure
• Cortex • Medulla • Renal pyramids
Blood Supply
• Renal artery (from abdominal aorta)
Functions
• Urine formation • Electrolyte balance • BP regulation
Applied
• Renal stone • Hydronephrosis
POUCH OF DOUGLAS ⭐
Definition
Rectouterine pouch in females.
Location
• Between uterus & rectum • Lowest peritoneal point
Importance
• Fluid collects here • Examined via posterior fornix
Applied
• Abscess • Ectopic rupture fluid
PORTAL VEIN ⭐
Formation
• SMV + Splenic vein
Course
• Behind neck of pancreas • Enters liver at porta hepatis
Function
• Carries nutrient-rich blood to liver
Applied
• Portal hypertension • Varices • Caput medusae
STOMACH BED
Structures Behind Stomach
• Pancreas • Left kidney • Spleen • Diaphragm • Transverse colon
Clinical Importance
• Posterior ulcer may erode pancreas
GREATER OMENTUM ⭐
Definition
Large peritoneal fold from greater curvature.
Structure
• 4-layered fold • Hangs like apron
Functions
• Fat storage • Infection control (policeman of abdomen)
Applied
• Omental patch in ulcer
RECTUS SHEATH
Formation
• Aponeurosis of 3 abdominal muscles
Contents
• Rectus abdominis • Superior & inferior epigastric vessels
Applied
• Hematoma • Surgical incision site
MESENTERY
Definition
Double layer of peritoneum attaching intestine to posterior wall.
Contents
• Blood vessels • Nerves • Lymphatics
Function
• Supports small intestine
PERINEUM ⭐
Definition
Area below pelvic diaphragm.
Divisions
• Urogenital triangle • Anal triangle
Contents
• External genitalia • Anal canal
Applied
• Episiotomy • Perineal tear
MECKEL’S DIVERTICULUM
Definition
Congenital remnant of vitelline duct.
Rule of 2
• 2 inches long • 2 feet from ileocecal junction • 2% population
Applied
• Bleeding • Mimics appendicitis
PERITONEUM ⭐
Types
• Parietal • Visceral
Greater Sac
• Main peritoneal cavity
Lesser Sac
• Behind stomach • Communicates via epiploic foramen
Applied
• Peritonitis • Ascites
BLOOD SUPPLY OF APPENDIX
Artery
• Appendicular artery • Branch of ileocolic artery
Importance
• End artery → Gangrene risk
PUDENDAL NERVE
Origin
• S2–S4
Course
• Leaves pelvis • Enters perineum
Supply
• Perineal muscles • External genitalia
Applied
• Pudendal nerve block • Incontinence
Same format maintain 👍 Compact + exam-oriented detail.
HISTOLOGY OF LUNGS ⭐
Bronchus
• Pseudostratified ciliated columnar epithelium • Goblet cells present • Cartilage plates • Smooth muscle
Bronchioles
• No cartilage • Simple ciliated columnar / cuboidal epithelium • Prominent smooth muscle
Alveoli
• Simple squamous epithelium • Type I pneumocytes – Gas exchange • Type II pneumocytes – Surfactant • Alveolar macrophages present
Applied
• Asthma – Bronchial narrowing • Emphysema – Alveolar destruction
HISTOLOGY OF LIVER ⭐
Structural Unit
• Hepatic lobule
Components
• Central vein in center • Hepatocytes in plates • Sinusoids between plates • Kupffer cells (macrophages)
Portal Triad
• Branch of hepatic artery • Branch of portal vein • Bile duct
Applied
• Cirrhosis – Fibrosis • Fatty liver
HISTOLOGY OF ESOPHAGUS ⭐
Layers
• Mucosa • Submucosa • Muscularis externa • Adventitia
Epithelium
• Stratified squamous non-keratinized
Muscle Type
• Upper 1/3 – Skeletal • Middle – Mixed • Lower 1/3 – Smooth
Applied
• GERD • Barrett’s esophagus
HISTOLOGY OF KIDNEY ⭐
Cortex
• Renal corpuscles • Proximal & distal convoluted tubules
Medulla
• Loop of Henle • Collecting ducts
Renal Corpuscle
• Glomerulus • Bowman’s capsule
Special Feature
• PCT – Brush border • DCT – No brush border
Applied
• Glomerulonephritis • Renal failure
SKELETAL vs CARDIAC vs SMOOTH MUSCLE ⭐
Skeletal Muscle
• Striated • Multinucleated • Voluntary • Peripheral nuclei
Cardiac Muscle
• Striated • Single nucleus • Involuntary • Intercalated discs
Smooth Muscle
• Non-striated • Single nucleus • Involuntary • Spindle shaped cells
Applied
• Myocardial infarction • Muscular dystrophy
EPITHELIUM CLASSIFICATION ⭐
Simple Epithelium
• Simple squamous – Alveoli • Simple cuboidal – Kidney tubules • Simple columnar – Intestine
Stratified Epithelium
• Stratified squamous – Skin • Stratified cuboidal • Stratified columnar
Special Types
• Pseudostratified – Respiratory tract • Transitional – Urinary bladder
Functions
• Protection • Absorption • Secretion • Filtration