Practical 1: Terminology and Concepts in Human Anatomy & Physiology

Surface Anatomy

Cephalic (Head) Regions

The cephalic region refers to the head and includes several specific anatomical areas important for orientation and clinical reference.

• Buccal: Cheek area

• Cranial: Surrounds the brain

• Frontal: Forehead

• Mental: Chin

• Nasal: Nose

• Occipital: Back of the head

• Ocular (Orbital): Eye region

• Oral: Mouth

• Otic: Ear

Body Trunk Regions

The trunk is the central part of the body, connecting the limbs and head, and houses major organs.

• Abdominal: Stomach area

• Cervical: Neck

• Dorsal (Dorsum): Back

• Gluteal: Buttocks

• Inguinal: Groin

• Lumbar: Lower back

• Pelvic: Pelvis

• Pubic: Genital region

• Sacral: Area over the sacrum

• Sternal: Breastbone

• Thoracic: Chest

• Vertebral: Spine

Upper Limb Regions

The upper limb includes the shoulder, arm, forearm, and hand.

• Acromial: Shoulder

• Axillary: Armpit

• Brachial: Upper arm

• Antecubital: Front of elbow

• Antebrachial: Forearm

• Carpal: Wrist

• Metacarpal: Hand bones

• Manual (Manus): Hand

• Palmar: Palm

• Digital: Fingers

• Pollex: Thumb

• Olecranal: Back of elbow

• Scapular: Shoulder blade

Lower Limb Regions

The lower limb includes the hip, thigh, leg, and foot.

• Coxal: Hip

• Femoral: Thigh

• Patellar: Front of knee

• Popliteal: Back of knee

• Crural: Leg

• Sural: Calf

• Tarsal: Ankle

• Metatarsal: Foot bones

• Pedal: Foot

• Digital: Toes

• Hallux: Big toe

• Plantar: Sole of foot

• Calcaneal: Heel

Directional Terms

Basic Anatomical Directions

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

• Anterior (Ventral): Toward the front

• Posterior (Dorsal): Toward the back

• Superior (Cranial): Toward the head

• Inferior (Caudal): Toward the feet

• Medial: Toward the midline

• Lateral: Away from the midline

• Proximal: Closer to the point of attachment

• Distal: Farther from the point of attachment

• Superficial: Near the surface

• Deep: Away from the surface

• Ipsilateral: Same side

• Contralateral: Opposite side

• Intermediate: Between two structures

Body Cavities

Dorsal and Ventral Cavities

The body contains major cavities that house organs and protect them.

• Dorsal Cavity: Includes the cranial cavity (brain) and vertebral cavity (spinal cord).

• Ventral Cavity: Includes the thoracic cavity (heart, lungs), and abdominopelvic cavity (digestive, urinary, reproductive organs).

Thoracic Cavity Subdivisions

• Pleural cavity: Surrounds each lung

• Pericardial cavity: Surrounds the heart

• Mediastinum: Central region containing heart, trachea, esophagus

Abdominopelvic Cavity Subdivisions

• Abdominal cavity: Contains digestive organs

• Pelvic cavity: Contains urinary bladder, reproductive organs

Abdominopelvic Divisions

Four Quadrants

The abdominopelvic region is divided for clinical reference.

• Right Upper Quadrant (RUQ)

• Left Upper Quadrant (LUQ)

• Right Lower Quadrant (RLQ)

• Left Lower Quadrant (LLQ)

Nine Regions

• Right hypochondriac region

• Epigastric region

• Left hypochondriac region

• Right lumbar region

• Umbilical region

• Left lumbar region

• Right iliac region

• Hypogastric region

• Left iliac region

Body Planes

Major Anatomical Planes

Body planes are used to describe sections and views of the body.

• Frontal (Coronal): Divides body into anterior and posterior

• Sagittal: Divides body into left and right

• Midsagittal: Divides body into equal left and right halves

• Transverse: Divides body into superior and inferior

• Oblique: Cuts at an angle

Serous Membranes

Structure and Function

Serous membranes line body cavities and cover organs, reducing friction.

• Parietal layer: Lines cavity walls

• Visceral layer: Covers organs

• Pleura: Lungs

• Pericardium: Heart

• Peritoneum: Abdominal organs

Organ Systems

Overview of Major Systems

The human body is organized into systems, each with specific functions and associated organs.

• Cardiovascular: Heart, blood vessels

• Digestive: Stomach, intestines, liver

• Endocrine: Glands (pituitary, thyroid, etc.)

• Integumentary: Skin, hair, nails

• Lymphatic: Lymph nodes, spleen

• Muscular: Muscles

• Nervous: Brain, spinal cord, nerves

• Respiratory: Lungs, trachea

• Skeletal: Bones

• Urinary: Kidneys, bladder

• Male reproductive: Testes, prostate

• Female reproductive: Ovaries, uterus

Histology

Epithelial Tissue

Epithelial tissue covers surfaces, lines cavities, and forms glands. It is classified by cell shape and layers.

• Apical surface: Exposed to body exterior or cavity

• Basement membrane: Anchors epithelium to connective tissue

• Cell projections: Cilia (movement), Microvilli (absorption)

Simple Epithelia

• Simple squamous epithelium: Single layer, flat cells (diffusion)

• Simple cuboidal epithelium: Single layer, cube-shaped (secretion)

• Simple columnar epithelium: Single layer, tall cells (absorption)

• Pseudostratified columnar epithelium: Appears layered, all cells touch basement membrane

• Mesothelium: Lines serous membranes

• Endothelium: Lines blood vessels

Stratified Epithelia

• Nonkeratinized stratified epithelium: Moist surfaces (mouth)

• Keratinized stratified epithelium: Dry surfaces (skin)

• Transitional epithelium: Stretches (bladder)

Connective Tissue

Connective tissue supports, protects, and binds other tissues. It is characterized by an abundant extracellular matrix.

• Extracellular matrix (ECM): Non-cellular material

• Ground substance: Fluid or gel-like component

• Fibers: Collagen (strength), Elastic (stretch), Reticular (support)

• Fibroblast cells: Produce fibers and ground substance

Loose Connective Tissue

• Areolar connective tissue: Cushions organs

• Adipose tissue: Stores fat

• Reticular tissue: Supports lymphoid organs

Dense Connective Tissue

• Dense regular collagenous: Parallel collagen fibers (tendons)

• Dense irregular collagenous: Irregular collagen fibers (dermis)

• Dense elastic: Elastic fibers (arteries)

Cartilage

• Hyaline cartilage: Smooth, supports joints

• Fibrocartilage: Strong, resists compression

• Elastic cartilage: Flexible (ear)

• Chondrocytes: Cartilage cells

Other Connective Tissues

• Blood: Fluid tissue, transports substances

• Compact bone: Hard tissue, supports body

• Osteocytes: Bone cells

Integumentary System

Layers of the Epidermis

The epidermis is the outermost layer of skin, composed of several strata.

• Stratum basale: Deepest layer, cell division

• Stratum spinosum: Provides strength

• Stratum granulosum: Keratin formation

• Stratum lucidum: Only in thick skin

• Stratum corneum: Superficial, dead cells

Layers of the Skin

• Epidermis: Epithelial tissue

• Dermis: Connective tissue

  • Papillary layer: Superficial, dermal papillae

  • Reticular layer: Deep, dense connective tissue

• Hypodermis: Subcutaneous fat

Skin Structures and Cells

• Hair follicle: Produces hair

• Arrector pili muscle: Causes hair to stand

• Sebaceous gland: Secretes oil

• Eccrine sweat gland: Produces sweat for cooling

• Apocrine sweat gland: Produces thicker sweat

• Tactile (Meissner’s) corpuscle: Touch receptor

• Lamellated (Pacinian) corpuscle: Pressure receptor

• Free nerve endings: Pain and temperature

• Melanocytes: Produce pigment

• Langerhans cells: Immune function

• Merkel cells: Touch sensation

• Adipose tissue: Fat storage

Types of Skin

• Thin skin: Covers most of the body, fewer layers

• Thick skin: Palms and soles, more layers, includes stratum lucidum

Summary Table: Major Organ Systems and Associated Organs

Organ System	Main Organs	Primary Function
Cardiovascular	Heart, blood vessels	Transport nutrients, gases, wastes
Digestive	Stomach, intestines, liver	Breakdown and absorb food
Endocrine	Glands (pituitary, thyroid, etc.)	Regulate body functions via hormones
Integumentary	Skin, hair, nails	Protection, temperature regulation
Lymphatic	Lymph nodes, spleen	Immunity, fluid balance
Muscular	Muscles	Movement, heat production
Nervous	Brain, spinal cord, nerves	Control, communication
Respiratory	Lungs, trachea	Gas exchange
Skeletal	Bones	Support, protection, movement
Urinary	Kidneys, bladder	Remove waste, regulate water
Male reproductive	Testes, prostate	Produce sperm, hormones
Female reproductive	Ovaries, uterus	Produce eggs, support fetus

Example: The stratum corneum of the epidermis provides a barrier against pathogens and dehydration, while the stratum basale is responsible for continuous cell division and regeneration of the skin.

Additional info: These notes expand on the terminology list by providing definitions, context, and examples for each anatomical term and concept, suitable for introductory study in human anatomy and physiology.