Introduction to Anatomy – Comprehensive Study Notes

Introduction to Anatomy – Context & Administrative Points

• Course: SOMS1912 – Human Systems 1; introductory lecture titled “Introduction to Anatomy”.
• Lecturer: Dr Christina Byun, Anatomy | School of Biomedical Sciences, UNSW.
  • Contact: christina.byun@unsw.edu.au
• Copyright notice displayed (Section 113P, Copyright Act 1968).
• Opening meme slide (“WAIT A SECOND… THIS ISN’T THE ENGLISH CLASS”) used to pivot from etymology to science.

What is Anatomy?

• Term derives from Greek
  • ana = “up”; temno = “I cut” → literal meaning: “I cut up” → dissection.
• Core discipline within biological sciences; foundation for all clinical health sciences.
• Historical practice: cadaveric dissection → modern correlation to imaging, virtual simulations.

Mandatory Pre-Lab Module – Ethics, Health & Safety

• Compulsory completion before Week 1 lab; unlocks subsequent modules.
• Components:
  • Two short videos (Part 1 & Part 2) – introduce ethics of human tissue use, regulations, PPE, lab conduct.
  • Online quiz – assesses comprehension; prerequisite to lab entry.
• Emphasises respect for donors, safe handling of biological material, and legal obligations.

Anatomical Terminology – The “Secret Language”

• Purpose: precise, universally agreed descriptors; avoids colloquialisms.
• Etymological examples:
  • Muscle (Latin musculus = “little mouse”): belly + tendon resemble mouse body + tail.
  • Sigmoid (Greek letter sigma “ς”): S-shaped curves—seen in sigmoid sinus & sigmoid colon.
  • Extensor hallucis brevis: Latin names convey action (extensor), target structure (great toe = hallux), length (brevis).
• Significance: understanding roots aids memory, decoding unfamiliar terms, exam performance.

Many Branches of Anatomy

• Systemic / Regional Anatomy – body systems vs. body regions.
• Clinical / Radiographic Anatomy – correlation with imaging (X-ray, CT, MRI, ultrasound).
• Histology – microscopic anatomy of tissues.
• Embryology – prenatal development.
• Neuroanatomy – CNS & PNS structures, pathways.
• Forensic / Anthropological / Biomechanics – application to legal, evolutionary, mechanical analyses.

Body Tissues & Systems – High-level Review

• Four basic tissue types (from Tortora table):
  • Epithelial – covers/protects, lines cavities, forms glands.
  • Connective – supports, binds; examples: tendon, cartilage, bone, blood, adipose.
  • Muscle – contracts for movement (skeletal, smooth, cardiac).
  • Nervous – conducts electrical signals, coordinates homeostasis.
• 11 major organ systems (Marieb; Complete Anatomy visual):
  • Integumentary – covering, vitamin D, thermoregulation.
  • Skeletal – support, protection, hematopoiesis, mineral store.
  • Muscular – movement, posture, heat.
  • Nervous – fast control, special senses.
  • Endocrine – hormones regulating growth, metabolism, reproduction.
  • Cardiovascular – transport blood carrying $O<em>2, CO</em>2,\ nutrients,\ wastes$; heart as pump.
  • Lymphatic/Immune – returns leaked fluid, debris disposal, lymphocyte maturation.
  • Respiratory – gaseous exchange, sound production.
  • Digestive – food breakdown, nutrient absorption, faeces excretion.
  • Urinary – eliminates nitrogenous waste, regulates water/electrolyte/acid–base balance.
  • Reproductive – gamete & hormone production, offspring development.

Digital Resource – “Complete Anatomy” 3-D Platform

• Steps for free UNSW student access:
  1. Download for preferred OS (macOS, Windows, iOS, Android).
  2. Choose “Sign Up via Institution” → register with @unsw.edu.au or @ad.unsw.edu.au.
  3. Validate email, then redeem code 461930315207 (or via Settings > My Account).
  4. Licence synchronises across devices.
• Features: >1 500 videos, expert-led courses, instructor push content, 3-D annotation & collaboration.
• Support: link to UNSW Library VPN & tutorial recording.

Anatomical Position – The Reference Posture

• Standardised frame of reference (text & THIEME image):
  • Body upright, facing forward.
  • Feet flat, directed forward.
  • Upper limbs at sides; palms facing anteriorly (supinated).
• Rationale: provides consistent orientation for directional terms regardless of actual body posture during description.

Directional (Relational) Terms

• Anterior (ventral) ↔ Posterior (dorsal).
• Superficial ↔ Deep.
• Superior (cranial/rostral) ↔ Inferior (caudal).
• Medial ↔ Lateral (relative to midline).
• Proximal ↔ Distal (limb attachment reference).
• Ipsilateral ↔ Contralateral (same vs. opposite side).
• Clinical signage: always interpret relative to anatomical position.

Anatomical Planes (3 Cardinal)

1. Sagittal
   • Divides body into right & left.
   • Mid-sagittal (median) – equal halves; para-sagittal – unequal.
2. Coronal (frontal) – anterior vs. posterior parts.
3. Transverse (horizontal/axial) – superior vs. inferior.

• Imaging relevance: CT & MRI slices in axial; ultrasound often sagittal/coronal.

Regional Anatomy – Major Body Segments

• Head, Neck.
• Trunk: Thorax, Abdomen, Pelvis/Perineum, Back.
• Limbs: Upper limb, Lower limb.
• Clinical charts label findings by region.

Body Cavities (Dorsal & Ventral)

• Dorsal:
  • Cranial cavity (brain).
  • Vertebral canal (spinal cord).
• Ventral:
  • Thoracic cavity – pleural (lungs) & pericardial (heart) within mediastinum; diaphragm as inferior boundary.
  • Abdominopelvic cavity – abdominal viscera & pelvic organs.
• Importance: pathways for disease spread, surgical approaches.

Abdominopelvic Sub-divisions

1. Nine-region method (for anatomical localisation):
   • Vertical: right & left midclavicular lines.
   • Horizontal: subcostal (inferior to costal margin) and transtubercular lines.
   • Regions (R → L, top → bottom):
   – Right hypochondriac | Epigastric | Left hypochondriac
   – Right lumbar | Umbilical | Left lumbar
   – Right inguinal (iliac) | Hypogastric (pubic) | Left inguinal.
2. Quadrant method (clinical, rapid):
   • Vertical median line & transverse trans-umbilical line.
   • RUQ, LUQ, RLQ, LLQ.

• Helps triage abdominal pain (e.g., RLQ → appendicitis suspicion).

Skeletal Overview

• Bone Classification (with examples):
  • Long – humerus, femur; levers for movement.
  • Short – carpals (trapezoid); stability w/ limited motion.
  • Flat – sternum, skull vault; protection, haemopoiesis.
  • Irregular – vertebra; complex shapes.
  • Sesamoid – patella; embedded in tendons, redirect force.
• Common Bony Landmarks (scapula & humerus diagrams):
  • Processes: spine, ridge, tubercle, tuberosity, condyle, head.
  • Depressions: fossa, notch, groove.
  • Articular modifiers: neck, angle.
• Significance: attachments for muscles/ligaments; reference points in imaging & surgery.

Joint Movements – Classification & Terminology

1. Gliding – flat surfaces slide (e.g., intercarpal joints).
2. Angular movements:
   • Flexion – decreases angle; Extension – increases angle (e.g., elbow, trunk).
   • Abduction – limb away from midline; Adduction – toward midline.
   • Circumduction – circular cone (combination of flexion + extension + abduction + adduction).
   • Lateral flexion – trunk/neck tilt in coronal plane.
3. Rotation:
   • Medial (internal) vs. Lateral (external) rotation around long axis (e.g., hip).
4. Special movements (often region-specific):
   • Elevation / Depression – scapula, mandible.
   • Protraction / Retraction – scapula, mandible.
   • Supination / Pronation – forearm: radius-ulna uncross (palm up) vs. cross (palm down).
   • Opposition – thumb to fingertip (precision grip).
   • Inversion / Eversion – sole medially vs. laterally.
   • Dorsiflexion / Plantarflexion – ankle up vs. down.

• Clinical significance: assessing joint integrity, neurological function, rehabilitation goals.

Integrative & Ethical Considerations

• Respect for body donors underpins cadaveric study; each specimen once a living person.
• Health & safety ensures student well-being and preservation of material.
• Anatomy links basic science to diagnostics (e.g., knowing vascular pathways informs angiography) and therapy (surgical planes, injection sites).

Study Tips & Resources

• Use etymology to memorise terms (mouse → musculus; sigma → sigmoid).
• Actively manipulate 3-D models in Complete Anatomy to match cadaver labs and textbook images.
• Practise directional & movement terms by describing your own limb motions in anatomical position.
• Leverage Moodle ANAT Activities for quizzes & interactive bone/landmark drills.
• Consult primary texts:
  • Tortora Principles of Anatomy & Physiology (2nd AP edition).
  • Marieb Human Anatomy (9th ed.).
  • THIEME Atlas of Anatomy (3rd ed.) – high-quality plates.

Forward Look

• Next lecture: Skeletal System – deeper dive into osteology, joints, biomechanics, and clinical correlations.
• Prepare by revising bone classifications & landmarks; explore scapula and humerus interactively.