Module 1 Lab Notes: Introduction to Anatomy & Physiology

Part 1: Body Regions

• Overview: The human body can be divided into regions to allow precise descriptions. Regions are smaller subsections of the head, neck, torso, upper limbs, and lower limbs.
• Learning aim for region terminology: Provide the correct anatomical term for common regional names.
• Anatomical terms mapping for common names:
  • a. head → Cephalon
  • i. arm → Brachium
  • q. thigh → Femur
  • b. face → Facies
  • j. front of elbow → Antecubitis
  • r. calf → Sura
  • c. eye → Oculus
  • k. forearm → Antebrachium
  • s. kneecap → Patella
  • d. mouth → Oris
  • l. wrist → Carpus
  • t. back of knee → Popliteus
  • e. cheek → Bucca
  • m. thumb → Pollex
  • u. leg → Crus
  • f. neck → Cervicis
  • n. hand → Manus
  • v. ankle → Tarsus
  • g. chest → Thorcis
  • o. fingers → Phalanges
  • w. foot → Pedal
  • h. armpit → Axilla
  • p. groin → Inguen
  • x. lower back → Lumbus
• Note: These terms form part of the language of anatomy used to describe locations with precision across clinical and educational contexts.

Part 2: Anatomical Position and Directional Terms

• Standard anatomical position (reference point):
  • The body is standing upright with the feet at shoulder width and parallel, toes forward.
  • Arms are slightly extended to the side, palms facing forward.
• Supine vs. Prone:
  • Supine: body lying face-up.
  • Prone: body lying face-down.
• Importance of anatomical position:
  • Provides a consistent frame of reference to describe locations of structures and avoid orientation confusion when the body moves.
• Directional terms (paired terms) used relative to anatomical position:
  • Anterior (ventral) vs Posterior (dorsal): Toward the front vs Toward the back
  • Superior (cranial) vs Inferior (caudal): Above/high vs Below/low
  • Lateral vs Medial: Away from midline vs Toward the midline
  • Proximal vs Distal: Closer to the point of attachment (limbs) vs Further from the point of attachment
  • Superficial vs Deep: Closer to the surface vs Further from the surface
• Practical note: These terms remain valid regardless of the body's orientation; use the position as if it were in anatomical position for interpretation.

Part 3: Body Planes

• Planes are imaginary two-dimensional surfaces that divide the body into sections.
• The three primary planes:
  • Frontal (coronal) plane: separates the body into anterior (front) and posterior (back) parts.
  • Sagittal plane: separates the body into right and left parts.
  • Midsagittal plane: a sagittal plane that divides the body into equal right and left halves.
  • Parasagittal plane: a sagittal plane that divides the body into unequal right and left parts.
  • Transverse (horizontal) plane: separates the body into superior (top) and inferior (bottom) parts.
• Applications: Planes are used to describe where sections/images are taken (e.g., MRI/CT slices) and to orient observers to the location of structures.
• Image context note: Images referenced in the original material (Visible Body) illustrate these planes.

Part 4: Body Cavities and Membranes

• Overview: The trunk is divided into cavities that house and protect organs. The two large compartments are dorsal and ventral cavities, with subdivisions inside each.
• Dorsal cavity:
  • Cranial cavity: houses the brain; formed by skull bones.
  • Vertebral (spinal) cavity: houses the spinal cord; formed by the vertebral column.
• Ventral cavity:
  • Thoracic cavity (superior to the diaphragm): contains three subdivisions:
  • Pericardial cavity: contains the heart.
  • Pleural cavities: contain the lungs.
  • Abdominopelvic cavity (inferior to the diaphragm): contains two subdivisions:
  • Abdominal cavity: contains digestive organs.
  • Pelvic cavity: contains reproductive organs.
• Labeling practice (cavities):
  • A. Dorsal body cavity
  • b. Cranial cavity
  • c. Vertebral cavity
  • D. Ventral body cavity
  • e. Thoracic cavity
  • f. Abdominal cavity
  • g. Pelvic cavity
• Organ locations by cavity (examples):
  • Stomach → Abdominal cavity
  • Ovary → Pelvic cavity
  • Brain → Cranial cavity
  • Lung → Pleural cavities (Thoracic)
  • Spinal cord → Vertebral cavity
  • Heart → Pericardial cavity (Thoracic)
  • Liver → Abdominal cavity
• Practical implications: Understanding cavities helps with safe surgical approaches, diagnostic imaging, and interpretation of symptoms (e.g., referred pain).

Part 5: Abdominopelvic Quadrants and Regions

• Concept: The abdomen can be divided in two ways:
  • Clinicians commonly use four abdominal quadrants separated by two imaginary lines crossing at the umbilicus.
  • Anatomists use nine abdominal regions to provide greater specificity.
• Abdominopelvic quadrants (four): RUQ, LUQ, RLQ, LLQ.
• Abdominopelvic regions (nine): Right hypochondriac, Epigastric, Left hypochondriac; Right lumbar, Umbilical, Left lumbar; Right iliac, Hypogastric, Left iliac.
• Organs and quadrant placements (organs may be in more than one quadrant):
  • Large intestine: RLQ, LLQ, RUQ, LUQ
  • Liver: RUQ, LUQ
  • Stomach: RUQ, LUQ
  • Urinary bladder: RLQ, LLQ
  • Small intestine: RLQ, LLQ, RUQ, LUQ
• Abdominopelvic regions where organs are found (many organs span multiple regions):
  • Large intestine: Right hypochondriac, Left hypochondriac, Epigastric, Right lumbar, Left lumbar, Umbilical, Right iliac, Left iliac, Hypogastric
  • Liver: Right hypochondriac, Epigastric, Left hypochondriac
  • Stomach: Left hypochondriac, Epigastric
  • Urinary bladder: Hypogastric
  • Small intestine: Right hypochondriac, Left hypochondriac, Epigastric, Right lumbar, Left lumbar, Umbilical, Right iliac, Left iliac, Hypogastric
• Practical relevance: Quadrants and regions help clinicians localize symptoms (pain, tenderness) and guide imaging and treatment planning.
• Contextual note: The material emphasizes how the abdominal region is a common focus in clinical assessments and imaging studies, and how standard terminology improves communication across medical disciplines.