A&P- Lab Practical #1

Regional Anatomy and Directional Terms

Directional Terms

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

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

• Dorsal vs. Ventral: Dorsal is the back side; ventral is the belly side.

• Cranial (cephalic) vs. Caudal: Cranial is toward the head; caudal is toward the tail or lower part of the body.

• Superior vs. Inferior: Superior is above; inferior is below.

• Medial vs. Lateral: Medial is toward the midline; lateral is away from the midline.

• Proximal vs. Distal: Proximal is closer to the point of attachment; distal is farther from the point of attachment.

• Superficial vs. Deep: Superficial is closer to the surface; deep is farther from the surface.

Sectional Planes

Sectional planes are imaginary lines used to divide the body for anatomical study.

• Horizontal or Transverse: Divides the body into superior and inferior parts.

• Coronal or Frontal: Divides the body into anterior and posterior parts.

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

Regional Terms

Regional terms specify distinct areas of the body.

• Head (Cephalic): Cranial, Facial, Frontal, Nasal, Ocular (orbital), Otic, Buccal, Oral, Mental

• Cervical: Neck region

• Trunk: Thoracic, Mammary, Abdominal, Umbilical, Inguinal, Pelvic

• Upper limbs: Axillary, Brachial, Antecubital, Olecranal, Antebrachial, Carpal, Manual, Palmar

• Lower limbs: Gluteal, Femoral, Patellar, Popliteal, Crural, Sural, Tarsal, Pedal, Digits

Body Cavities, Major Organs, and Serous Membranes

Major Body Cavities and Organs

The body contains several major cavities that house vital organs and are lined by serous membranes.

• Thoracic cavity: Contains the heart, lungs, pericardium, and pleura.

• Diaphragm: Muscle separating thoracic and abdominal cavities.

• Abdominopelvic cavity: Contains the liver, stomach, small intestine, large intestine, kidneys, pancreas, spleen, and peritoneum.

The Microscope

Basic Parts and Functions

Understanding the microscope is essential for studying tissues and cells.

• Base: Supports the microscope.

• Oculars: Eyepieces for viewing.

• Objectives: Lenses of varying magnification.

• Stage: Platform for slides.

• Stage controls: Move the slide on the stage.

• Iris diaphragm: Adjusts light intensity.

• Light control: Regulates light source.

• Condenser: Focuses light on the specimen.

• Focus (coarse and fine): Brings specimen into sharp focus.

The Cell

Cellular Structures

Cells are the basic units of life, each with specialized structures (organelles) that perform specific functions.

• Plasma membrane: Encloses the cell, regulates entry and exit of substances.

• Cytoplasm: Gel-like substance inside the cell.

• Nucleus: Contains genetic material (DNA).

• Endoplasmic reticulum (ER): Smooth ER (lipid synthesis), Rough ER (protein synthesis).

• Golgi apparatus: Modifies, sorts, and packages proteins.

• Mitochondria: Powerhouse of the cell, site of ATP production.

• Lysosomes: Contain digestive enzymes.

• Centrioles: Involved in cell division.

Cell Types

• Goblet cells: Secrete mucus.

• Fibroblasts: Produce connective tissue fibers.

• Adipocytes: Store fat.

• Macrophages: Engulf pathogens and debris.

• Mast cells: Release histamine in inflammation.

• Chondrocytes: Cartilage cells.

• Osteocytes: Bone cells.

• Neurons (glia): Nerve cells and supporting cells.

• Keratinocytes: Main cells of the epidermis.

• Melanocytes: Produce melanin pigment.

Tissues

Epithelial Tissue

Epithelial tissues cover body surfaces, line cavities, and form glands. They are classified by cell shape and number of layers.

• Simple squamous: Single layer of flat cells (e.g., alveoli).

• Simple cuboidal: Single layer of cube-shaped cells (e.g., kidney tubules).

• Simple columnar: Single layer of tall cells (e.g., digestive tract lining).

• Stratified squamous: Multiple layers, flat surface cells (e.g., skin, mouth lining).

• Stratified cuboidal: Multiple layers, cube-shaped surface cells (rare).

• Stratified columnar: Multiple layers, column-shaped surface cells (rare).

• Pseudostratified ciliated columnar: Appears layered but all cells touch the basement membrane (e.g., respiratory tract).

• Transitional: Stretches, found in urinary bladder.

Connective Tissue Proper

• Areolar: Loose, supports and binds tissues.

• Adipose: Stores fat, insulates, cushions.

• Reticular: Forms supporting framework of organs.

• Dense regular: Parallel collagen fibers (e.g., tendons).

• Dense irregular: Irregularly arranged fibers (e.g., dermis).

• Elastic: Contains elastic fibers, allows stretching.

Fluid Connective Tissue

• Blood: Transports gases, nutrients, wastes.

Supportive Connective Tissue

• Hyaline cartilage: Most common, found in joints.

• Fibrocartilage: Strong, found in intervertebral discs.

• Elastic cartilage: Flexible, found in ear.

• Bone: Rigid, supports and protects.

Muscle Tissue

• Skeletal: Voluntary, striated, attached to bones.

• Cardiac: Involuntary, striated, found in heart.

• Smooth: Involuntary, non-striated, found in walls of organs.

Integumentary System

Epidermis

The epidermis is the outermost layer of the skin, composed of several strata (layers):

• Stratum basale: Deepest layer, site of cell division.

• Stratum spinosum: Provides strength and flexibility.

• Stratum granulosum: Contains granules, cells begin to die.

• Stratum lucidum: Present only in thick skin (palms, soles).

• Stratum corneum: Outermost, dead, keratinized cells.

Dermis

• Papillary layer: Superficial, contains dermal papillae.

• Reticular layer: Deeper, dense irregular connective tissue.

Accessory Structures

• Hair (root and shaft): Protection, sensation.

• Arrector pili muscle: Causes hair to stand (goosebumps).

• Apocrine sweat gland: Found in armpits, groin; active at puberty.

• Eccrine sweat gland: Widely distributed, regulates temperature.

• Sebaceous (oil) gland: Secretes sebum, lubricates skin.

• Tactile (Meissner's) corpuscle: Touch receptor.

• Lamellar (Pacinian) corpuscle: Pressure receptor.

• Nerves: Sensory input.

• Subpapillary & cutaneous plexuses: Networks of blood vessels.

Summary Table: Major Tissue Types and Examples

Tissue Type	Example Location	Function
Epithelial (Simple squamous)	Alveoli of lungs	Diffusion, filtration
Connective (Areolar)	Under epithelia	Support, binding
Muscle (Skeletal)	Attached to bones	Voluntary movement
Nervous (Neuron)	Brain, spinal cord	Transmit impulses

Additional info: These notes expand on the provided outline with definitions, examples, and context for each anatomical and physiological concept, suitable for exam preparation in a college-level Anatomy & Physiology course.