Introduction to Human Anatomy

Introduction to Human Anatomy

  • Introduction to anatomy.

  • Importance of anatomy in medical education.

  • Prof. Jaime Marco’s course on Dentistry Human Anatomy and Embryology.

Index

  • Historical background.

  • Anatomical terminology.

  • Nomina anatomica.

  • Regional and systemic anatomy.

  • Anatomical position.

  • Planes and axes of the human body.

  • Anatomical terminology (repeated).

  • Terms of relationship and comparison.

  • Terms of movement.

  • Body cavities.

  • Anatomical variations.

Historical Background

  • Origin of the word Anatomy:

    • Greek word ANATOMÉ.

    • Prefix ana meaning 'upwards'.

    • Suffix tome meaning 'to cut' or 'to dissect' (i.e., "To cut through").

  • Evolution of anatomical studies:

    • Ancient medical knowledge documented first in papyrus.

    • Key historical locations: Egypt, Greece, Alexandria, Rome, Padua.

    • Pioneers of anatomy: Hippocrates, Herophilus, Galen, Vesalius, contributing to modern anatomy through dissections and foundational texts.

    • Galen’s writings are foundational work in the field.

  • Significance of dissections:

    • Dissection of animals and public human cadaver demonstrations enhanced understanding of human anatomy.

Anatomical Terminology

  • Need for specific, precise language in anatomy to avoid ambiguous interpretations.

  • Key Terms:

    • Eponym: A name derived from a person used to name a structure (e.g., Eustachian tube, Fallopian tube).

    • Acronym: An abbreviation formed from the initial letters of other words, pronounced as a single word (e.g., CNS for Central Nervous System).

  • Examples of eponyms:

    • Phalopian tube: Also called uterine tube or oviduct.

    • Stenson duct: Parotid duct.

  • Examples of acronyms:

    • CSF: Cerebrospinal fluid.

Nomina Anatomica

  • International list of anatomical terms officially recognized by the International Scientific Committee.

  • The necessity of standardized terms arose mid-1900s to ensure consistency globally.

  • First published in 1895 as "Nomina anatomica of Basel" and underwent several revisions over time.

Regional and Systemic Anatomy

  • Categories:

    • Gross Anatomy: Surface, regional, and systemic anatomy.

    • Cytology and Histology: Study of internal cell structures and tissues.

Surface Anatomy

  • Focus on structures perceptible to touch and their morphology.

  • Importance: Differentiates normal from abnormal anatomical findings.

Regional Anatomy

  • Study method concentrating on specific body parts (e.g., head).

  • Body organized into major segments: head, neck, trunk, upper & lower limbs.

Systemic Anatomy

  • Study of organ systems working together (e.g., integumentary, skeletal, muscular systems).

    • Functions of organ systems include:

    1. Food intake and processing.

    2. Gas exchange.

    3. Detoxification.

    4. Internal body transportation.

    5. Body movement and posture.

    6. Communication and coordination.

    7. Isolation from the environment.

    8. Defense against disease.

    9. Reproduction.

Standard Anatomical Position

  • Definition: A standardized frame of reference for anatomical descriptions.

  • Characteristics:

    • Stands upright (erect).

    • Faces forward (eyes straight ahead).

    • Arms at sides with palms facing forward.

    • Legs straight with feet together, pointing forward.

Anatomical Planes

  • Sagittal Plane: Divides body into left and right parts.

  • Coronal Plane: Divides body into anterior (front) and posterior (back) parts.

  • Axial (Transverse) Plane: Divides body into superior (upper) and inferior (lower) parts.

Plane-Specific Relationship Terms

  1. Sagittal Plane:

    • Medial: Closer to the midline.

    • Lateral: Further from the midline.

  2. Transverse Plane:

    • Superior (Cranial): Above.

    • Inferior (Caudal): Below.

  3. Coronal Plane:

    • Anterior (Ventral): Front part of the body.

    • Posterior (Dorsal): Back part of the body.

Other Relationship Terms

  • Superficial: Closer to the body surface.

  • Deep: Further from the body surface.

  • Proximal: Closer to a structure’s origin.

  • Distal: Farther from a structure’s origin.

Terms of Movement

  • Movement types based on anatomical position and planes thereof:

  1. Sagittal Plane:

    • Flexion: Decreasing angle between body parts.

    • Extension: Increasing angle between body parts.

  2. Frontal (Coronal) Plane:

    • Abduction: Moving away from the median plane.

    • Adduction: Moving towards the median plane.

    • Eversion/Inversion: Foot movements away/toward the median plane.

  3. Transverse (Axial) Plane:

    • Rotation: Turning around a longitudinal axis.

    • Medial/Lateral rotation: Closer to/Further from median plane.

    • Pronation/Supination: Forearm movements.

    • Circumduction: Circular movement through sequential flexion, extension, and rotation.

Body Cavities

  • Defined areas within the body that contain organs, protected by serous membranes:

    1. Cranial cavity: Houses the brain.

    2. Vertebral cavity: Houses the spinal cord.

    3. Thoracic cavity: Contains heart and lungs.

    4. Abdominal cavity: Contains digestive organs.

    5. Pelvic cavity: Contains reproductive organs.

  • Serous Cavity Examples:

    • Pericardial cavity: Surrounding the heart.

    • Pleural cavities: Surrounding each lung.

    • Peritoneal cavity: Within the abdominal cavity.

Anatomical Variations

  • Definition: Normal morphological variations not associated with disease.

    • Examples:

    • Variation in transverse foramina.

    • Anomalies in aortic branches.

Bibliography

  • Key References:

    • Drake RL, Vogl AW, Mitchell AWM. Gray’s Basic Anatomy, 4th Edition, 2019.

    • Moore K; Dalley A, Agur A. Clinical Oriented Anatomy, 7th Edition, 2013.

    • Martini FH, Tallitsch RB, Nath JL. Human Anatomy, 8th Edition, 2018.

    • Natsis K et al. "Anatomic variations of the branches of the aortic arch in a Peruvian population", Medwave 2015 July;15(6):e6194.