Branch
General anatomy
What It Covers
Bones, joints, muscles, cartilage, blood vessels, nerves
How It Is Tested
Short notes, viva
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Anatomy Notes for MBBS 1st Year
Anatomy is the largest subject of Phase 1 MBBS, and it sets the foundation for every clinical subject that follows. These notes give you a region-by-region summary of high-yield gross anatomy, plus neuroanatomy, histology, embryology, genetics and the clinical anatomy points examiners expect in theory papers and viva.
SME-reviewed. Updated 2026.
Open these Anatomy notes in the GeckoMed app Quick Summary: What You Must Know
- Anatomy in 1st Year covers gross anatomy, general anatomy, histology, embryology, neuroanatomy and genetics under the NMC Competency Based Medical Education (CBME) curriculum.
- Every structure is answered in the same sequence: location, relations, blood supply, nerve supply, lymphatic drainage, applied anatomy.
- Nerve injuries of the upper and lower limb are among the most tested applied topics.
- Diaphragm openings: inferior vena cava at T8, oesophagus at T10, aorta at T12.
- Portocaval anastomoses explain oesophageal varices, caput medusae and haemorrhoids in portal hypertension.
- Histology is scored mainly through labelled diagrams and identifying features.
- Embryology questions focus on derivatives and congenital anomalies.
Anatomy Syllabus at a Glance
| Branch | What It Covers | How It Is Tested |
|---|---|---|
| General anatomy | Bones, joints, muscles, cartilage, blood vessels, nerves | Short notes, viva |
| Upper limb | Pectoral region, axilla, arm, forearm, hand, joints | Long essays, spotters, osteology |
| Lower limb | Gluteal region, thigh, leg, foot, joints | Long essays, spotters, osteology |
| Thorax | Thoracic wall, lungs, pleura, heart, mediastinum | Long essays, spotters, radiology |
| Abdomen and pelvis | Abdominal wall, peritoneum, gastrointestinal organs, kidneys, pelvic organs | Long essays, spotters |
| Head and neck | Scalp, face, neck triangles, glands, cranial cavity, orbit | Long essays, spotters |
| Neuroanatomy | Spinal cord, brainstem, cerebellum, cerebrum, ventricles, blood supply | Long essays, viva |
| Histology | Basic tissues and organ histology | Short notes with diagrams, slide identification |
| Embryology | General and systemic embryology | Short notes, models |
| Genetics | Chromosomes, karyotype, inheritance, chromosomal disorders | Short notes, viva |
Branch
Upper limb
What It Covers
Pectoral region, axilla, arm, forearm, hand, joints
How It Is Tested
Long essays, spotters, osteology
Branch
Lower limb
What It Covers
Gluteal region, thigh, leg, foot, joints
How It Is Tested
Long essays, spotters, osteology
Branch
Thorax
What It Covers
Thoracic wall, lungs, pleura, heart, mediastinum
How It Is Tested
Long essays, spotters, radiology
Branch
Abdomen and pelvis
What It Covers
Abdominal wall, peritoneum, gastrointestinal organs, kidneys, pelvic organs
How It Is Tested
Long essays, spotters
Branch
Head and neck
What It Covers
Scalp, face, neck triangles, glands, cranial cavity, orbit
How It Is Tested
Long essays, spotters
Branch
Neuroanatomy
What It Covers
Spinal cord, brainstem, cerebellum, cerebrum, ventricles, blood supply
How It Is Tested
Long essays, viva
Branch
Histology
What It Covers
Basic tissues and organ histology
How It Is Tested
Short notes with diagrams, slide identification
Branch
Embryology
What It Covers
General and systemic embryology
How It Is Tested
Short notes, models
Branch
Genetics
What It Covers
Chromosomes, karyotype, inheritance, chromosomal disorders
How It Is Tested
Short notes, viva
General Anatomy: Key Points
| Topic | Must-Know Point |
|---|---|
| Types of joints | Fibrous, cartilaginous and synovial |
| Synovial joints | Classified by shape, for example hinge, ball-and-socket, pivot |
| Hilton's law | The nerve supplying a joint also supplies the muscles moving it and the skin over their insertions |
| Cartilage types | Hyaline, elastic and fibrocartilage |
| Bone ossification | Intramembranous and endochondral |
Topic
Types of joints
Must-Know Point
Fibrous, cartilaginous and synovial
Topic
Synovial joints
Must-Know Point
Classified by shape, for example hinge, ball-and-socket, pivot
Topic
Hilton's law
Must-Know Point
The nerve supplying a joint also supplies the muscles moving it and the skin over their insertions
Topic
Cartilage types
Must-Know Point
Hyaline, elastic and fibrocartilage
Topic
Bone ossification
Must-Know Point
Intramembranous and endochondral
Upper Limb Notes
Brachial plexus: Formed by the ventral rami of C5 to T1. Arranged as roots, trunks (upper C5 to C6, middle C7, lower C8 to T1), divisions, cords (lateral, posterior, medial) and terminal branches.
| Nerve Injury | Common Site or Cause | Classic Result |
|---|---|---|
| Erb's palsy (C5, C6) | Upper trunk injury | Waiter's tip position |
| Klumpke's palsy (C8, T1) | Lower trunk injury | Claw hand, may include Horner's syndrome |
| Axillary nerve | Fracture of surgical neck of humerus, shoulder dislocation | Deltoid paralysis, sensory loss over the regimental badge area |
| Radial nerve | Fracture of shaft of humerus (spiral groove) | Wrist drop |
| Ulnar nerve | Injury near the medial epicondyle | Ulnar claw hand, loss of fine finger movements |
| Median nerve | Carpal tunnel syndrome, injury at the wrist | Ape thumb deformity, thenar wasting |
Nerve Injury
Erb's palsy (C5, C6)
Common Site or Cause
Upper trunk injury
Classic Result
Waiter's tip position
Nerve Injury
Klumpke's palsy (C8, T1)
Common Site or Cause
Lower trunk injury
Classic Result
Claw hand, may include Horner's syndrome
Nerve Injury
Axillary nerve
Common Site or Cause
Fracture of surgical neck of humerus, shoulder dislocation
Classic Result
Deltoid paralysis, sensory loss over the regimental badge area
Nerve Injury
Radial nerve
Common Site or Cause
Fracture of shaft of humerus (spiral groove)
Classic Result
Wrist drop
Nerve Injury
Ulnar nerve
Common Site or Cause
Injury near the medial epicondyle
Classic Result
Ulnar claw hand, loss of fine finger movements
Nerve Injury
Median nerve
Common Site or Cause
Carpal tunnel syndrome, injury at the wrist
Classic Result
Ape thumb deformity, thenar wasting
Other high-yield points:
- Rotator cuff: supraspinatus, infraspinatus, teres minor and subscapularis.
- Carpal tunnel contents: the median nerve and nine flexor tendons.
- Anatomical snuffbox: the scaphoid lies in its floor and the radial artery crosses it.
[Diagram: Brachial plexus with roots, trunks, divisions, cords and branches]
Lower Limb Notes
| Topic | Must-Know Point |
|---|---|
| Femoral triangle | Bounded by the inguinal ligament, sartorius and adductor longus. Contents from lateral to medial: femoral nerve, artery, vein, canal |
| Sciatic nerve | Root value L4 to S3. Gluteal injections are given in the upper outer quadrant to avoid it |
| Common peroneal (fibular) nerve | Injury at the neck of the fibula causes foot drop |
| Superior gluteal nerve | Injury causes a positive Trendelenburg sign |
| Knee joint | The anterior cruciate ligament prevents forward displacement of the tibia on the femur |
| Unhappy triad | Anterior cruciate ligament, medial collateral ligament and medial meniscus injured together |
| Great saphenous vein | Passes in front of the medial malleolus and drains into the femoral vein at the saphenous opening; incompetent valves cause varicose veins |
| Arches of the foot | Medial longitudinal, lateral longitudinal and transverse |
Topic
Femoral triangle
Must-Know Point
Bounded by the inguinal ligament, sartorius and adductor longus. Contents from lateral to medial: femoral nerve, artery, vein, canal
Topic
Sciatic nerve
Must-Know Point
Root value L4 to S3. Gluteal injections are given in the upper outer quadrant to avoid it
Topic
Common peroneal (fibular) nerve
Must-Know Point
Injury at the neck of the fibula causes foot drop
Topic
Superior gluteal nerve
Must-Know Point
Injury causes a positive Trendelenburg sign
Topic
Knee joint
Must-Know Point
The anterior cruciate ligament prevents forward displacement of the tibia on the femur
Topic
Unhappy triad
Must-Know Point
Anterior cruciate ligament, medial collateral ligament and medial meniscus injured together
Topic
Great saphenous vein
Must-Know Point
Passes in front of the medial malleolus and drains into the femoral vein at the saphenous opening; incompetent valves cause varicose veins
Topic
Arches of the foot
Must-Know Point
Medial longitudinal, lateral longitudinal and transverse
[Diagram: Femoral triangle with boundaries and contents]
Thorax Notes
| Topic | Must-Know Point |
|---|---|
| Diaphragm openings | Inferior vena cava at T8, oesophagus at T10, aorta at T12 |
| Intercostal neurovascular bundle | Lies in the costal groove along the lower border of the rib in the order vein, artery, nerve; needles are inserted along the upper border of the rib below |
| Coronary arteries | The left coronary artery divides into the anterior interventricular (left anterior descending) and circumflex arteries |
| Right main bronchus | Shorter, wider and more vertical, so inhaled foreign bodies lodge more often on the right |
| Bronchopulmonary segments | Ten on the right; usually eight to ten on the left because some segments fuse |
| Thoracic duct | Begins at the cisterna chyli and drains into the junction of the left subclavian and left internal jugular veins |
| Pleural recesses | Fluid collects first in the costodiaphragmatic recess |
Topic
Diaphragm openings
Must-Know Point
Inferior vena cava at T8, oesophagus at T10, aorta at T12
Topic
Intercostal neurovascular bundle
Must-Know Point
Lies in the costal groove along the lower border of the rib in the order vein, artery, nerve; needles are inserted along the upper border of the rib below
Topic
Coronary arteries
Must-Know Point
The left coronary artery divides into the anterior interventricular (left anterior descending) and circumflex arteries
Topic
Right main bronchus
Must-Know Point
Shorter, wider and more vertical, so inhaled foreign bodies lodge more often on the right
Topic
Bronchopulmonary segments
Must-Know Point
Ten on the right; usually eight to ten on the left because some segments fuse
Topic
Thoracic duct
Must-Know Point
Begins at the cisterna chyli and drains into the junction of the left subclavian and left internal jugular veins
Topic
Pleural recesses
Must-Know Point
Fluid collects first in the costodiaphragmatic recess
[Diagram: Heart with coronary arteries and their branches]
Abdomen and Pelvis Notes
| Topic | Must-Know Point |
|---|---|
| Inguinal hernia | Indirect hernia passes lateral to the inferior epigastric vessels through the deep ring; direct hernia bulges medial to them through Hesselbach's triangle |
| McBurney's point | Junction of the lateral one-third and medial two-thirds of a line from the anterior superior iliac spine to the umbilicus |
| Appendix | The retrocaecal position is the most common |
| Epiploic foramen | Connects the greater sac with the lesser sac |
| Liver segments | Eight functional (Couinaud) segments, the basis of segmental resection |
| Portocaval anastomoses | Lower oesophagus, anal canal, umbilicus, retroperitoneum and bare area of the liver |
| Pudendal nerve | Root value S2 to S4 |
| Uterus | Normally anteverted and anteflexed; supported by the pelvic floor and ligaments such as the transverse cervical ligament |
Topic
Inguinal hernia
Must-Know Point
Indirect hernia passes lateral to the inferior epigastric vessels through the deep ring; direct hernia bulges medial to them through Hesselbach's triangle
Topic
McBurney's point
Must-Know Point
Junction of the lateral one-third and medial two-thirds of a line from the anterior superior iliac spine to the umbilicus
Topic
Appendix
Must-Know Point
The retrocaecal position is the most common
Topic
Epiploic foramen
Must-Know Point
Connects the greater sac with the lesser sac
Topic
Liver segments
Must-Know Point
Eight functional (Couinaud) segments, the basis of segmental resection
Topic
Portocaval anastomoses
Must-Know Point
Lower oesophagus, anal canal, umbilicus, retroperitoneum and bare area of the liver
Topic
Pudendal nerve
Must-Know Point
Root value S2 to S4
Topic
Uterus
Must-Know Point
Normally anteverted and anteflexed; supported by the pelvic floor and ligaments such as the transverse cervical ligament
[Diagram: Portal venous system with sites of portocaval anastomosis]
Head and Neck Notes
| Topic | Must-Know Point |
|---|---|
| Scalp layers | Skin, connective tissue, aponeurosis, loose areolar tissue, pericranium (SCALP). The loose areolar layer is the danger area because emissary veins can spread infection inward |
| Facial nerve palsy | Lower motor neuron lesion (Bell's palsy) paralyses the whole half of the face; upper motor neuron lesion spares the upper face |
| Parotid gland | The facial nerve passes through it; the parotid duct opens opposite the upper second molar |
| Danger area of the face | Infection can spread to the cavernous sinus through facial and ophthalmic veins |
| Cavernous sinus | Oculomotor, trochlear, ophthalmic and maxillary nerves lie in its lateral wall; the internal carotid artery and abducent nerve pass through it |
| Thyroid gland | The recurrent laryngeal nerve is closely related to the inferior thyroid artery; the external laryngeal nerve runs with the superior thyroid artery |
| Little's area | Site of Kiesselbach's plexus on the nasal septum, the common source of nosebleeds |
Topic
Scalp layers
Must-Know Point
Skin, connective tissue, aponeurosis, loose areolar tissue, pericranium (SCALP). The loose areolar layer is the danger area because emissary veins can spread infection inward
Topic
Facial nerve palsy
Must-Know Point
Lower motor neuron lesion (Bell's palsy) paralyses the whole half of the face; upper motor neuron lesion spares the upper face
Topic
Parotid gland
Must-Know Point
The facial nerve passes through it; the parotid duct opens opposite the upper second molar
Topic
Danger area of the face
Must-Know Point
Infection can spread to the cavernous sinus through facial and ophthalmic veins
Topic
Cavernous sinus
Must-Know Point
Oculomotor, trochlear, ophthalmic and maxillary nerves lie in its lateral wall; the internal carotid artery and abducent nerve pass through it
Topic
Thyroid gland
Must-Know Point
The recurrent laryngeal nerve is closely related to the inferior thyroid artery; the external laryngeal nerve runs with the superior thyroid artery
Topic
Little's area
Must-Know Point
Site of Kiesselbach's plexus on the nasal septum, the common source of nosebleeds
[Diagram: Cavernous sinus in coronal section]
Neuroanatomy Notes
| Topic | Must-Know Point |
|---|---|
| Spinal cord | Ends at about the L1 to L2 level in adults; lumbar puncture is done below this level |
| Dorsal column | Carries fine touch, vibration and proprioception |
| Lateral spinothalamic tract | Carries pain and temperature |
| Brown-Séquard syndrome | Same-side loss of motor function and dorsal column sensation, opposite-side loss of pain and temperature below the lesion |
| Internal capsule | Corticospinal fibres pass through the posterior limb; supplied by lenticulostriate branches of the middle cerebral artery |
| Circle of Willis | Formed by the anterior cerebral, anterior communicating, internal carotid, posterior communicating and posterior cerebral arteries |
| CSF circulation | Lateral ventricles, interventricular foramen, third ventricle, cerebral aqueduct, fourth ventricle, subarachnoid space, arachnoid granulations |
Topic
Spinal cord
Must-Know Point
Ends at about the L1 to L2 level in adults; lumbar puncture is done below this level
Topic
Dorsal column
Must-Know Point
Carries fine touch, vibration and proprioception
Topic
Lateral spinothalamic tract
Must-Know Point
Carries pain and temperature
Topic
Brown-Séquard syndrome
Must-Know Point
Same-side loss of motor function and dorsal column sensation, opposite-side loss of pain and temperature below the lesion
Topic
Internal capsule
Must-Know Point
Corticospinal fibres pass through the posterior limb; supplied by lenticulostriate branches of the middle cerebral artery
Topic
Circle of Willis
Must-Know Point
Formed by the anterior cerebral, anterior communicating, internal carotid, posterior communicating and posterior cerebral arteries
Topic
CSF circulation
Must-Know Point
Lateral ventricles, interventricular foramen, third ventricle, cerebral aqueduct, fourth ventricle, subarachnoid space, arachnoid granulations
[Diagram: Circle of Willis]
Histology Notes
| Tissue or Organ | Identifying Features |
|---|---|
| Hyaline cartilage | Homogeneous matrix, chondrocytes in lacunae, isogenous groups, perichondrium |
| Compact bone | Haversian systems with concentric lamellae around a central canal |
| Skeletal muscle | Striations, multiple peripheral nuclei |
| Cardiac muscle | Striations, branching fibres, central nucleus, intercalated discs |
| Thymus | Lobules with cortex and medulla, Hassall's corpuscles |
| Duodenum | Brunner's glands in the submucosa |
| Thyroid | Colloid-filled follicles lined by cuboidal epithelium |
| Trachea | Pseudostratified ciliated columnar epithelium with goblet cells, C-shaped hyaline cartilage |
Tissue or Organ
Hyaline cartilage
Identifying Features
Homogeneous matrix, chondrocytes in lacunae, isogenous groups, perichondrium
Tissue or Organ
Compact bone
Identifying Features
Haversian systems with concentric lamellae around a central canal
Tissue or Organ
Skeletal muscle
Identifying Features
Striations, multiple peripheral nuclei
Tissue or Organ
Cardiac muscle
Identifying Features
Striations, branching fibres, central nucleus, intercalated discs
Tissue or Organ
Thymus
Identifying Features
Lobules with cortex and medulla, Hassall's corpuscles
Tissue or Organ
Duodenum
Identifying Features
Brunner's glands in the submucosa
Tissue or Organ
Thyroid
Identifying Features
Colloid-filled follicles lined by cuboidal epithelium
Tissue or Organ
Trachea
Identifying Features
Pseudostratified ciliated columnar epithelium with goblet cells, C-shaped hyaline cartilage
For full slide-wise preparation, see histology slides identification and histology important questions.
Embryology and Genetics Notes
| Topic | Must-Know Point |
|---|---|
| Germ layers | Ectoderm (nervous system, epidermis), mesoderm (muscle, bone, heart, kidney), endoderm (gut lining, liver, lungs) |
| Pharyngeal pouches | First: middle ear cavity and auditory tube. Second: palatine tonsil. Third: inferior parathyroid and thymus. Fourth: superior parathyroid and ultimobranchial body |
| Midgut rotation | 270 degrees anticlockwise around the superior mesenteric artery |
| Meckel's diverticulum | Remnant of the vitellointestinal duct |
| Tetralogy of Fallot | Ventricular septal defect, pulmonary stenosis, overriding aorta, right ventricular hypertrophy |
| Chromosomal disorders | Down syndrome (trisomy 21), Turner syndrome (45,X), Klinefelter syndrome (47,XXY) |
Topic
Germ layers
Must-Know Point
Ectoderm (nervous system, epidermis), mesoderm (muscle, bone, heart, kidney), endoderm (gut lining, liver, lungs)
Topic
Pharyngeal pouches
Must-Know Point
First: middle ear cavity and auditory tube. Second: palatine tonsil. Third: inferior parathyroid and thymus. Fourth: superior parathyroid and ultimobranchial body
Topic
Midgut rotation
Must-Know Point
270 degrees anticlockwise around the superior mesenteric artery
Topic
Meckel's diverticulum
Must-Know Point
Remnant of the vitellointestinal duct
Topic
Tetralogy of Fallot
Must-Know Point
Ventricular septal defect, pulmonary stenosis, overriding aorta, right ventricular hypertrophy
Topic
Chromosomal disorders
Must-Know Point
Down syndrome (trisomy 21), Turner syndrome (45,X), Klinefelter syndrome (47,XXY)
Key Mnemonics
PYQ-Style Questions
Questions from these topics regularly appear in university Anatomy papers. Here are examples of the question style:
- Describe the brachial plexus. Add a note on Erb's palsy. (Long essay)
- Describe the inguinal canal. Add a note on inguinal hernia. (Long essay)
- Write a short note on portocaval anastomoses.
- Write a short note on the cavernous sinus.
- Describe the blood supply of the heart. Add a note on its applied anatomy.
Practise with real papers: MBBS Anatomy Question Papers | RGUHS | KNRUHS | TNMGRMU | NTRUHS | WBUHS | KUHS | RUHS
Frequently Asked Questions
What topics are covered in Anatomy in MBBS 1st Year?
Gross anatomy of all body regions, general anatomy, neuroanatomy, histology, embryology and genetics, as per the NMC CBME curriculum.
How should I use these Anatomy notes for exams?
Use them for rapid revision after reading your textbook. Pair each region with its diagrams, then test yourself on your university's previous year question papers and viva questions.
Which Anatomy topics are most important for 1st Year exams?
Brachial plexus and limb nerve injuries, inguinal canal, heart and its blood supply, portal circulation, cavernous sinus, internal capsule and the histology of core organs are consistently high-yield.
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