Body Organization and Anatomical Terminology

Directional Terms

Directional terms are used to describe the locations of structures in relation to other structures or locations in the body.

• Superior/Inferior: Superior means above; inferior means below.

• Anterior/Posterior: Anterior refers to the front; posterior refers to the back.

• Medial/Lateral: Medial means toward the midline; lateral means away from the midline.

• Superficial/Deep: Superficial means closer to the surface; deep means further from the surface.

• Proximal/Distal: Proximal means closer to the point of attachment; distal means further from the point of attachment.

Sectional Planes

Sectional planes are used to divide the body or organs for anatomical study.

• Frontal (coronal) plane: Divides the body into anterior and posterior portions.

• Sagittal plane: Divides the body into right and left portions. The midsagittal plane divides exactly at the midline.

• Transverse plane: Divides the body into superior and inferior portions.

Body Cavities and Membranes

Major and Specific Body Cavities

The body contains several cavities that house organs and provide protection.

• Dorsal cavity: Includes the cranial and vertebral cavities.

• Anterior (ventral) cavity: Includes thoracic (pleural, pericardial, mediastinum) and abdominopelvic cavities.

Serous Membranes and Associated Cavities

Serous membranes line body cavities and cover organs, providing lubrication and protection.

• Pleura: Surrounds the lungs.

• Pericardium: Surrounds the heart.

• Peritoneum: Surrounds abdominal organs.

Abdominopelvic Regions and Quadrants

The abdominopelvic cavity is divided for anatomical reference.

• Quadrants: Right and left upper quadrant, right and left lower quadrant.

• Regions: Right/left hypochondriac, right/left lumbar, right/left iliac, epigastric, umbilical, hypogastric.

Organ Systems and Their Organs

Major Organ Systems

Each organ system has specific organs and functions.

• Endocrine

• Respiratory

• Digestive

• Lymphatic

• Cardiovascular

• Reproductive

• Urinary

Microscopy and Cell Structure

Parts of a Light Microscope

Understanding the microscope is essential for studying cells and tissues.

• Arm, base, head, ocular lens, objective lenses, nosepiece, coarse/fine focus knob, light, light intensity control, power switch, stage, mechanical stage control.

Animal Cell Structures

Cells contain various organelles, each with specific functions.

• Nucleus

• Cytoskeleton

• Lysosome

• Centrioles

• Flagellum

• Microvilli

• Cilia

• Golgi apparatus

• Rough/smooth endoplasmic reticulum

• Ribosome

• Mitochondria

• Peroxisome

Stages of Mitosis and Meiosis

Cell division occurs through mitosis and meiosis, each with distinct stages.

• Mitosis: Prophase, metaphase, anaphase, telophase.

• Meiosis: Similar stages, but includes two rounds of division.

Diffusion and Osmosis

Movement of substances across membranes is essential for cell function.

• Diffusion: Movement of molecules from high to low concentration.

• Osmosis: Diffusion of water across a semipermeable membrane.

• Isotonic, hypertonic, hypotonic solutions: Affect cell volume and shape.

Example: Placing red blood cells in NaCl solutions demonstrates osmotic effects.

Tissues and Histology

Types of Epithelial Tissue

Epithelial tissues cover surfaces and line cavities.

• Simple squamous, simple cuboidal, simple columnar, pseudostratified columnar, stratified squamous, transitional epithelium.

Types of Connective Tissue

Connective tissues support, bind, and protect organs.

• Areolar, adipose, dense regular/irregular, hyaline cartilage, elastic cartilage, fibrocartilage, bone, blood.

Example: Adipose tissue stores fat; hyaline cartilage provides flexible support.

Integumentary System

Components of the Integumentary System

The skin and its associated structures protect the body and regulate temperature.

• Epidermis: Stratum basale, spinosum, granulosum, lucidum, corneum.

• Dermis: Papillary and reticular layers.

• Hypodermis: Subcutaneous layer.

• Accessory structures: Sweat glands, sebaceous glands, hair follicle, nail, sensory receptors.

Skeletal System

Bones of the Skeletal System

The skeletal system provides structure, protection, and movement.

• Facial bones: Maxilla, mandible, zygomatic, sphenoid, ethmoid, lacrimal, nasal, palatine, vomer.

• Vertebrae: Atlas, axis, cervical, thoracic, lumbar, sacrum, coccyx.

• Ribs: True, false, floating.

• Pectoral girdle: Clavicle, scapula.

• Upper limb: Humerus, ulna, radius, carpals, metacarpals, phalanges.

• Pelvic girdle: Ilium, ischium, pubis.

• Lower limb: Femur, tibia, fibula, tarsals, calcaneus, talus, metatarsals, phalanges, patella.

Bony Features and Landmarks

Bony landmarks are used for identification and attachment of muscles and ligaments.

• Temporal: Mastoid process, styloid process, external auditory meatus, mandibular fossa, zygomatic process.

• Occipital: Condyles, foramen magnum.

• Sphenoid: Sella turcica, optic canal.

• Ethmoid: Cribriform plate, crista galli, perpendicular plate.

• Mandible: Coronoid process, mandibular condyle.

• Maxilla: Palatine process.

• Vertebral parts: Body, vertebral canal, transverse process, spinous process, intervertebral discs.

• Sternum: Manubrium, body, xiphoid process.

• Scapula: Spine, acromion, coracoid process, glenoid cavity/fossa.

• Humerus: Greater tubercle, lesser tubercle, head, olecranon fossa, trochlea, capitulum, medial epicondyle, lateral epicondyle.

• Ulna: Olecranon process, trochlear notch, coronoid process, radial notch, styloid process.

• Radius: Head, tuberosity, styloid process.

• Pelvic bones: Acetabulum, pubic symphysis, pubic arch, ischial tuberosity, obturator foramen, iliac crest, greater sciatic notch.

• Femur: Head, neck, greater trochanter, lesser trochanter, lateral/medial condyles.

• Tibia: Tibial tuberosity, anterior crest, medial malleolus.

• Fibula: Head, lateral malleolus.

Structure of an Osseous Model

Osseous tissue forms the rigid structure of bones.

• Osteon, periosteum, endosteum, central canal, perforating canal, lacunae, lamellae, osteocyte, trabeculae.

Additional info:

• For practical exams, be able to identify these structures on models, diagrams, and histological slides.

• Understanding anatomical terminology and bony landmarks is essential for clinical applications and further study in health sciences.