ANAPHY-TRANSES

Page 1: Introduction to Anatomy and Terminology

Anatomy Overview

  • Anatomy: Studies the structure of the body parts and their relationships.

  • Physiology: Study of how the body and its parts work or function.

  • Pathophysiology: Examines functional changes associated with disease and aging.

Types of Anatomy

Gross or Macroscopic Anatomy

  • Involves larger structures visible to the naked eye.

  • Approached through:

    • Regional Anatomy: Focuses on specific areas of the body.

    • Systematic Anatomy: Studies the body systems.

Surface Anatomy

  • Examines internal structures as they relate to the overlying skin surface.

Microscopic Anatomy

  • Focuses on structures that cannot be seen with the naked eye; requires a microscope.

  • Subdivisions include:

    • Cytology: Study of cells.

    • Histology: Study of tissues.

Developmental Anatomy

  • Investigates structural changes throughout the life span, including:

    • Embryology: Changes occurring before birth.

Terminology

  • Special terminology is essential to prevent misunderstanding, covering aspects like position, direction, regions, and structures.

Anatomical Position

  • Person stands erect with feet together and eyes forward.

  • Palms face anteriorly with thumbs pointed away.

  • Key terms include:

    • Prone Position: Face down.

    • Supine Position: Face up.

Directional Terms

  • Superior (Cranial/Cephalad): Towards the head or upper part.

  • Inferior (Caudal): Away from the head, towards the lower part.

  • Ventral (Anterior): Front of the body.

  • Dorsal (Posterior): Backside of the body.

  • Medial: Towards the midline.

  • Lateral: Away from the midline.

  • Intermediate: Between medial and lateral.

  • Proximal: Close to the point of attachment.

  • Distal: Farther from the point of attachment.

  • Superficial: Towards the body surface.

  • Deep: Away from the surface.

  • Ipsilateral: On the same side.

  • Contralateral: On opposite sides.

Page 2: Body Planes and Cavities

Body Planes

  • A body plane is an imaginary line that separates the body into sections:

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

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

    • Transverse Plane: Divides the body into upper and lower sections.

Body Cavities

Dorsal Body Cavity

  • Cranial Cavity: Houses the brain.

  • Spinal Cavity: Houses the spinal cord.

Ventral Body Cavity

  • Thoracic Cavity: Houses heart, lungs, and other organs.

  • Abdominopelvic Cavity: Houses digestive system and most urinary system organs.

Other Body Cavities

  • Oral and Digestive Cavities: Involved in digestion.

  • Nasal Cavity: For air passage.

  • Orbital Cavities: For the eyes.

  • Middle Ear Cavities: Contain auditory structures.

  • Synovial Cavities: Surround joints.

Integumentary System Overview

  • Functions: Protection, excretion, temperature regulation, and vitamin D production.

  • Components: Skin, nails, hair, and glands.

Page 3: Organ Systems Overview

Cardiovascular System

  • Function: Transports materials via blood pumped by the heart.

  • Components: Heart and blood vessels, carrying oxygen, carbon dioxide, nutrients, and wastes.

Lymphatic System

  • Function: Returns fluids to blood vessels, cleanses the body, involved in immunity.

  • Components: Thoracic duct, lymph nodes, and lymphatic vessels.

Respiratory System

  • Function: Supplies blood with oxygen and removes carbon dioxide.

  • Components: Nasal cavity, pharynx, larynx, trachea, bronchus, and left lung.

Digestive System

  • Function: Breaks down food, absorbs nutrients, eliminates indigestible materials as feces.

  • Components: Oral cavity, esophagus, stomach, small and large intestines, rectum, and anus.

Urinary System

  • Function: Eliminates nitrogenous wastes and regulates water and electrolytes.

  • Components: Kidneys, ureters, urinary bladder, and urethra.

Reproductive System

  • Function: Produces offspring.

  • Components:

    • Male: Testes, seminal vesicles, prostate gland, penis, and scrotum.

    • Female: Mammary glands, uterine tubes, ovaries, and vagina.

Page 4: Characteristics of Life and Survival Needs

Characteristics of Life

  • Movement: Activities promoted by muscular contraction.

  • Digestion: Breaking down indigestible foodstuffs.

  • Metabolism: All chemical reactions within the body, including anabolism (building) and catabolism (breaking down).

  • Excretion: Removal of wastes (feces, urine, salts).

  • Reproduction: Production of offspring.

  • Growth: Increase in size.

Survival Needs

  1. Nutrients

  2. Oxygen

  3. Water

  4. Normal body temperature

Cellular Basis of Life

  • All living things are composed of cells, which are the basic units of life.

  • All cells arise from pre-existing cells.

Cell Composition

  • Most cells contain:

    • Carbon

    • Hydrogen

    • Oxygen

    • Nitrogen

  • Cells are approximately 60-80% water.

Page 5: Body Tissues

Epithelial Tissue

  • Locations: Body coverings, linings, and glandular tissues.

  • Functions: Protection, absorption, filtration, secretion.

Hallmarks of Epithelial Tissue

  • Covers and lines body surfaces.

  • Forms sheets with apical (free) surfaces and basement membranes.

  • Avascular but regenerates easily if well-nourished.

Classification of Epithelia

  • Number of Cell Layers:

    • Simple: One layer

    • Stratified: More than one layer

  • Shape of Cells:

    • Squamous: Flattened (fish scale-like)

    • Cuboidal: Cube-shaped

    • Columnar: Column-like

Simple-Squamous Epithelium

  • Description: Single layer of flat cells.

  • Function: Diffusion and filtration.

  • Location: Air sacs of lungs, walls of capillaries, serous membranes.

Page 6: Connective Tissue

General Characteristics

  • Connects body parts, most abundant and widely distributed tissue.

  • Functions: Protection, support, binding.

Elements of Connective Tissue

  • Extracellular Matrix:

    • Ground Substance: Water, adhesion proteins, polysaccharide molecules.

    • Fibers: Collagen (white), elastic (yellow), and reticular fibers.

Types of Connective Tissue

  1. Bone (Osseous Tissue):

  • Composed of osteocytes in lacunae, hard matrix of calcium salts.

  • Functions to protect and support.

  1. Cartilage: Found in specific areas, less hard and more flexible.

  2. Dense Connective Tissue: Provides strength and support (tendons, ligaments).

  3. Loose Connective Tissue (Areolar): Holds organs in place, soft and pliable.

  4. Blood: Composed of blood cells in plasma, functions in transportation (nutrients and wastes).

Page 7: Skin Structure

Integumentary System

Skin Structure

  • Subcutaneous Tissue (Hypodermis): Deep to dermis, anchors skin to organs, composed of adipose tissue.

Epidermis

  • Layers:

    • Stratum Basale: Deepest layer, where cell division occurs.

    • Stratum Spinosum: Several layers thick, provides strength.

    • Stratum Granulosum: Contains keratin-producing cells.

    • Stratum Lucidum: Present only in thick skin (palms and soles).

    • Stratum Corneum: Outermost layer, composed of dead, keratinized cells.

Cells in the Epidermis

  • Keratinocytes: Produce keratin for protection.

  • Melanocytes: Synthesize melanin pigment for skin color.

  • Dendritic (Langerhans) Cells: Immune function; ingest foreign substances.

  • Tactile (Merkel) Cells: Sensory receptors.

Dermis

  • Layers:

    • Papillary Layer: Areolar connective tissue, contains capillaries and sensory receptors.

    • Reticular Layer: Dense connective tissue, provides strength.

Page 8: Skin Appendages and Functions

Appendages of the Skin

  • Sweat Glands:

    • Eccrine Glands: Most numerous, produce sweat for temperature regulation.

    • Apocrine Glands: Ducts empty into hair follicles, involved in scent production.

  • Hair:

    • Derived from hair follicles, consists of medulla, cortex, and cuticle.

Homeostatic Imbalance

  • Whitehead: Blocked sebaceous gland duct.

  • Blackhead: Oxidized sebum.

  • Acne: Inflammation of sebaceous glands.

  • Hirsutism: Excessive hairness.

  • Alopecia: Hair thinning or baldness.

Skin Functions

  • Protection: Chemical, physical, and biological barriers.

  • Temperature Regulation: Maintains homeostasis through blood flow.

  • Sensation: Rich sensory supply for external stimuli.

  • Metabolic Functions: Synthesizes vitamin D.

  • Blood Reservoir: Holds a significant portion of blood volume.

  • Excretion: Eliminates wastes in sweat.

Page 9: Skin Cancer Types

Skin Cancer Overview

Types of Skin Cancer

  1. Basal Cell Carcinoma: Most common, arises from stratum basale, least malignant.

  2. Squamous Cell Carcinoma: Can metastasize if not removed; early removal allows good prognosis.

  3. Malignant Melanoma: Cancer of melanocytes; the most deadly, detected using the ABCD rule:

    • A: Asymmetry

    • B: Border irregularity

    • C: Color variation

    • D: Diameter greater than 6mm.