Anatomical Position

Introduction to Anatomy and Movement

  • Thinking Outside the Box:

    • Emphasizes the importance of different perspectives in learning.

    • Uses a marshmallow model to explain concepts of axis of rotation and planes of movement.

    • Observations made during the demonstration indicate around which axis the marshmallow spins.

Historical Context of Anatomy

  • Definition of Anatomy:

    • Derived from the Greek word meaning "to cut up, cut open" or "to dissect".

    • Early practices in anatomical research were often barbaric but also formed the basis of incredible artistic works.

  • Historical Figures:

    • Leonardo da Vinci:

    • Renowned as a scientist, architect, sculptor, mathematician, and painter.

    • Created a significant collection of anatomical drawings, notably the "Vitruvian Man".

  • Demand for Cadavers in Anatomy Studies:

    • As interest in anatomy grew, so did the need for cadavers, leading to body-snatching and even a rise in murders to obtain specimens.

    • The Anatomy Act of 1832 aimed to provide a legitimate means of acquiring bodies for study.

Evolution of Anatomical Knowledge

  • Henry Gray and Gray's Anatomy:

    • First Publication: 1855, titled "Gray's Anatomy of the Human Body".

    • Collection of hand-drawn medical notes and diagrams for practical use by traveling doctors.

    • Continues to be updated and serves as an essential educational tool for anatomy students today.

Understanding the Anatomical Position

  • Anatomical Position:

    • A standardized reference point for describing the locations and relationships of anatomical parts.

    • Key features include:

    • Upright position

    • Head, eyes, and toes pointed forward

    • Feet together, arms slightly out to the side

    • Forearms fully supinated (palms facing forward).

  • Standard Directions Relative to Anatomical Position:

    • Anterior: Front of the body, e.g., the nose is anterior to the ears.

    • Posterior: Back of the body, e.g., the ears are posterior to the nose.

    • Superior (Cephalic): Above, e.g., the head is superior to the trunk.

    • Inferior (Caudal): Below, e.g., the knee is inferior to the hip.

    • Lateral: Away from the midline, e.g., little toe is lateral to the big toe.

    • Medial: Toward the midline, e.g., little finger is medial to the thumb.

    • Distal: Away from the trunk, e.g., foot is distal to the knee.

    • Proximal: Close to the trunk, e.g., wrist is proximal to the hand.

    • Superficial: Close to the surface, e.g., ribs are superficial to the heart.

    • Deep: Away from the surface, e.g., heart is deep to the rib cage.

Types of Movements and Terminology

  • Basic Movements:

    • Flexion and Extension:

    • Flexion: Decreases the angle between two body segments (bending).

    • Extension: Increases the angle between body parts (straightening).

    • Abduction and Adduction:

    • Abduction: Moves a body segment away from the midline.

    • Adduction: Moves a body segment toward the midline.

    • Elevation and Depression:

    • Elevation: Movement upwards.

    • Depression: Movement downwards, the opposite of elevation.

Location Specific Movements

  • Foot Movements:

    • Dorsiflexion: Bringing toes closer to the shin (e.g., walking on heels).

    • Plantar Flexion: Decreases the angle between the sole of the foot and the back of the leg (e.g., standing on toes).

  • Forearm Movements:

    • Pronation: Rotational movement that turns the palm posteriorly.

    • Supination: Rotational movement that turns the palm anteriorly.

  • Foot Tilting Movements:

    • Inversion: Sole tilts toward the midline.

    • Eversion: Sole tilts away from the midline.

Anatomical Planes and Axes

  • Anatomical Planes:

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

    • Sagittal Plane: Divides the body into left and right segments.

    • Frontal (Coronal) Plane: Divides the body into anterior (front) and posterior (back) sections.

  • Anatomical Axes:

    • Anatomical Axis: Points around which body rotation occurs.

    • Types of Axes:

    • Longitudinal (Polar) Axis: North-South relationship to the anatomical position.

    • Horizontal (Bilateral) Axis: East-West relationship to the anatomical position.

    • Antero-Posterior Axis: Front-Back relationship to the anatomical position.

Summary of Axes and Planes with Movement Examples

Axis of Rotation

Plane of Motion

Example

Horizontal (Bilateral)

Sagittal

Flexion, extension

Longitudinal (Polar)

Transverse

Rotation of extremities, axial rotation

Antero-Posterior (Sagittal Axis)

Coronal (Frontal)

Abduction, adduction

Anatomy and Physiology

  • Definitions:

    • Anatomy: Studies the structural organization of living organisms.

    • Physiology: Investigates basic processes like reproduction, growth, and metabolism within body systems.

    • Exercise Physiology: Focuses on the body's response and adaptation to the stresses imposed by exercise.

The General Rule for Describing Body Movement

  • The axis of rotation is always perpendicular to the plane of movement.

  • Movement Examples:

    • Flexion: Reduces joint angle (e.g., bending elbow).

    • Extension: Increases joint angle (e.g., straightening elbow).

    • Abduction: Moves segment away from body (e.g., arm raised sideways).

    • Adduction: Moves segment toward body.

  • Specific Terms for Movements:

    • Plantar Flexion: Pointing toes, standing on tiptoes.

    • Dorsiflexion: Bending ankle to bring foot closer to the shin.

    • Supination: Palm facing up.

    • Pronation: Palm facing down.

    • Inversion: Twisting ankle, standing on outer edge of foot.

    • Eversion: Standing on inner edge of foot.

    • External Rotation: Twisting outward from midline.

    • Internal Rotation: Twisting inward towards midline.

    • Elevation: Moving shoulders upwards.

    • Depression: Moving shoulders downwards.

    • Circumduction: Combination of flexion, extension, abduction, and adduction (e.g., softball pitch action).