INTRODUCTION TO GROSS ANATOMY

The Goal

  • The structural and functional relationships of various cells, tissues,
  • The lecture presents an overview of gross anatomy for a beginner.
  • To aid vocabulary building.
  • Understanding of the usage of terminologies.

Outline

  • Basic divisions of anatomy
  • Anatomical Terminologies
  • Planes
  • Osteology & Classification of joints
  • Principles of kinesiology
  • General organization of body system

Basic Divisions of Anatomy

  • Divisions include:
    • Systemic: Includes all systems. Can you mention them?
    • Regional: Upper and Lower limbs; Thorax and Abdomen; Pelvis and Perineum; Head and Neck/Neuroanatomy

Anatomical Terminologies

Anatomical Position

  • The anatomic position serves as a standard reference for anatomic descriptions, axis of rotation, and planes of motion.
  • Action of a muscle is based on the assumption that it contracts with the body in the anatomic position.
  • Description or examination of any part lies on this assumption.
  • Generally, anatomical position is the specific arrangement of the body that can be used as the position of reference for describing the anatomical planes and axis of the body from different postural positions (standing, sitting, lying prone or supine).

Anatomical Position – Examples of Postures

  • Erect posture: standing upright, face forward, feet held together.
  • Sitting upright: upper limb hanging by the sides, lower limb flexed at the knee, feet together with dorsum directed upwards.
  • Supine: lying on back, face upward, feet together, dorsum of the foot pointing upwards, hands laterally with palms facing upwards.
  • Prone: face down; other positions maintained as in supine, but dorsum of the foot faces downwards from viewer's perspective.

Anatomical Terminologies I

  • Anterior: Toward the front of the body
  • Posterior: Toward the back of the body
  • Midline: Imaginary line that courses vertically through the center of the body
  • Medial: Toward the midline of the body
  • Lateral: Away from the midline

Anatomical Terminologies II

  • Superior: Above, or toward the head
  • Inferior: Below, or toward the feet
  • Proximal: Closer to, or toward the torso
  • Distal: Away from the torso
  • Cephalic: Toward the head
  • Caudal: Toward the feet (or "tail")

Anatomical Terminologies III

  • Superficial: Toward the surface (skin) of the body
  • Deep: Toward the inside (core) of the body
  • Origin: The proximal attachment of a muscle or ligament
  • Insertion: The distal attachment of a muscle or ligament
  • Prone: Describes the position of an individual lying face down
  • Supine: Describes the position of an individual lying face up

Terms Used to Describe the Hand and Feet

  • Palmar: Palm side of the hand
  • Plantar: Sole side of the foot
  • Dorsal: Top side of the foot or back side of the hand
  • Digits: Small bones in the hand and feet, arranged in proximal and distal rows

Planes

  • Sagittal plane: Divides the body into left and right halves
  • Frontal (coronal) plane: Divides the body into front and back aspects
  • Horizontal (transverse) plane: Divides the body into upper and lower aspects

Planes – Orientation (Illustrative labels from the diagram)

  • Superior | Sagittal plane | Right | Posterior
  • Anterior | Left | Inferior | Frontal plane
  • (These labels illustrate the relationships among planes and directional terms.)

Imaginary Lines and Landmarks

  • Midline: A line drawn in the midline of the body
  • Midclavicular: A line drawn across the middle of the left and right clavicles
  • Midaxillary: A line across the middle of the axilla
  • Transillaic: A line that passes across the iliac tubercles of the iliac bone
  • Suprapubic: A line across the pubic symphysis of the hip bone

Axis of Rotation

  • The axis of rotation of a joint is the pivot point about which joint motion occurs.
  • The axis of rotation is always perpendicular to the plane of motion.
  • Translation occurs when all parts of a “body” move in the same direction as every other part.

Axes of Rotation and Associated Movements

  • Axis of Rotation: Anterior-posterior | Plane of Motion: Frontal
    • Examples of Movement: Hip abduction-adduction; Shoulder abduction-adduction
  • Axis of Rotation: Medial-lateral | Plane of Motion: Sagittal
    • Examples of Movement: Elbow flexion-extension; Knee flexion-extension
  • Axis of Rotation: Vertical (longitudinal) | Plane of Motion: Horizontal
    • Examples of Movement: Shoulder internal-external rotation; Rotation of the trunk

Common Osteokinematic Terms

  • Flexion and extension
  • Dorsiflexion and plantar flexion
  • Abduction and adduction
  • Lateral flexion
  • Ulnar and radial deviation
  • Eversion and inversion
  • Internal (medial) and external (lateral) rotation
  • Axial rotation
  • Forward and backward bending
  • Circumduction: circular motion through two planes

Osteology

  • Osteology is the study of bones.

Types of Bone Cells

  • Osteoblast: Bone forming cells
  • Osteoclast: Bone absorption and removal of unwanted tissue
  • Osteocyte: Mature bone cell that helps maintain bone as living tissue
  • Hematopoietic cells: Precursors for blood cells
  • Fat cells: Adipose cells of the bone marrow

Classification of Joints

  • Joints (articulations) are where two or more bones meet; they enable movement and provide stability.
  • Classifications can be based on structure or on function.
  • Structural classification divides joints into: bony, fibrous, cartilaginous, and synovial joints (based on material and presence/absence of a joint cavity).

Classification of Bones

  • Based on division: Axial and Appendicular skeleton
  • Based on shape, size, and length: Flat bones, Short bones, Long bones, Irregular bones, Sesamoid bones

Classification of Joints by Function

  • Synarthroses: immovable joints (e.g., sutures, gomphoses, synchondroses)
  • Amphiarthroses: allow slight movement (e.g., syndesmoses, symphyses)
  • Diarthroses: allow free movement (e.g., synovial joints)

General Organization of the Body

  • Anatomy: Organism I to IX progression (as per slide):
    • Atoms, Subatomic particles I
    • Molecules III
    • Organelles IV
    • Cells V
    • Tissues VI
    • Organs VII
    • Organ Systems VIII
    • Organism IX
  • The Life-line (concept map connecting levels from molecules to whole organism)

Levels of Organization of the Human Body

  • Cell
  • Tissue
  • Organ
  • Systems

Closing / References

  • Thank you
  • See recommended textbooks

Practical and Cross-cutting Notes

  • This module is a beginner-friendly overview of gross anatomy, focusing on standard terminology, planes, axes, and basic organization of the body.
  • Key practical implications: use the anatomical position as reference, understand muscle actions based on that position, and be able to identify planes and axes when describing movements.
  • Ethical/philosophical/d real-world relevance: foundational framework for clinical anatomy, surgical planning, imaging interpretation, and understanding how structure relates to function in health and disease.