Introduction to Anatomy/Physiology - Vocabulary Flashcards

Directional Terminology and Planes

  • Importance: Knowing anatomical and directional terminology enables clear, shared communication among veterinarians and technicians, helps pinpoint structures, and speeds up description of lesions or locations.

  • Core directional terms (quadruped-specific emphasis where noted):

    • Rostral: toward the nose/toward the tip of the nose

    • Caudal: toward the tail

    • Cranial: toward the head (often used interchangeably with rostral in humans, but rostral is common in veterinary contexts)

    • Cranial vs. Caudal in quadrupeds can differ from humans; cranial toward the head, caudal toward the tail.

    • Dorsal: toward the back/spine

    • Ventral: toward the belly/underside

    • Proximal: toward the center or beginning of a limb

    • Distal: away from the center or beginning of a limb

    • Medial: toward the midline of the body

    • Lateral: away from the midline

    • Axial: toward the axis of a structure (e.g., along the main body axis)

    • Abaxial: away from the axis

    • Palmar: caudal (underside) surface of the forelimb (from the carpal joint distally to the bottom of the foot/hoof)

    • Plantar: caudal surface of the hindlimb (from the tarsal joint distally to the bottom of the foot/hoof)

  • Planes of section:

    • Transverse plane: divides the body into cranial and caudal sections (or proximal and distal sections in limbs)

    • Median (mid-sagittal) plane: divides body into equal left and right halves

    • Sagittal plane: divides body into unequal left and right halves

    • Dorsal plane: divides body into dorsal and ventral sections

  • Key historical note: Anatomical nomenclature includes terms used for humans and animals; some differences arise due to quadruped locomotion and posture.

  • Visual aids suggested: study images showing directional terms and planes (e.g., Figure 1-1) to reinforce orientation.

Systematic Anatomy and Nomenclature

  • Systematic anatomy: a structured approach used in this course; emphasizes naming by organ system and chief structures.

  • Table 1-1: Nomenclature for Systematic Anatomy (Chief Structures and Name of Study)

    • Skeletal system → Osteology → Bones

    • Articular system → Arthrology (Syndesmology) → Joints

    • Muscular system → Myology → Muscles

    • Digestive system → Splanchnology → Stomach and intestines

    • Respiratory system → Splanchnology → Lungs and airways

    • Urinary system → Splanchnology → Kidneys and urinary bladder

    • Reproductive system → Endocrine (note: table lists Endocrine in context with reproductive organs) → Ovaries and testes

    • Nervous system → Neurology → Brain, spinal cord, and nerves

    • Circulatory system → Cardiology → Heart and vessels

    • Sensory system → Esthesiology → Eye and ear

  • Practical takeaway: use this framework to classify organs and tissues systematically when labeling anatomical structures.

Hierarchy of Life Sciences and Physiology

  • Hierarchy from smallest to largest: Atoms→Molecules→Genes→Organelles→Cells→Tissues→Organs→Organ→Organisms→Populations→Ecosystems\text{Atoms} \rightarrow \text{Molecules} \rightarrow \text{Genes} \rightarrow \text{Organelles} \rightarrow \text{Cells} \rightarrow \text{Tissues} \rightarrow \text{Organs} \rightarrow \text{Organ} \rightarrow \text{Organisms} \rightarrow \text{Populations} \rightarrow \text{Ecosystems}

  • Define physiology: the science of life and how different systems work together.

  • Conceptual takeaway: physiology is best understood through the systematic anatomy framework (cells → tissues → organs → organ systems).

Animal Cells and Tissues: Overview

  • Cells form tissues; tissues form organs; organs form organ systems; organ systems form organisms.

  • A single cell can perform all fundamental life processes: growth, reproduction, metabolism, irritability/excitability, conduction, contraction.

  • Core life processes to remember:

    • Growth

    • Reproduction

    • Metabolism

    • Irritability/Exsitability

    • Conduction

    • Contraction

  • Tissues summarize common functions and provide the structural basis for organ systems.

Four Primary Tissue Types

  • Epithelial Tissue: protection, absorption, secretion, sensory roles

  • Connective Tissue: support, binding, transport, immunity

  • Muscle Tissue: movement and locomotion

  • Nervous Tissue: coordination and control of body activities

Epithelial Tissue

  • Tissue types (structural classifications):

    • Simple: squamous, cuboidal, columnar

    • Stratified: squamous, cuboidal, columnar

    • Pseudostratified columnar

    • Transitional

  • Functions: barrier protection, selective absorption/secretion, sensor functions, protective lining.

  • Epithelial cells classification by shape and arrangement (examples):

    • Simple squamous: location and function

    • Location: air sacs of lungs; lining of heart, blood vessels, lymphatic vessels

    • Function: diffusion and filtration; lubrication via secretions

    • Summary: thin barrier; limited protective strength

    • Simple cuboidal: location and function

    • Location: kidney passages

    • Function: secretion and absorption

    • Simple columnar (with/without cilia): location and function

    • Location (ciliated): bronchi, uterine tubes, uterus

    • Location (non-ciliated): lining of digestive tract and bladder

    • Function: protective barrier; specialized roles in secretion and absorption in digestive tract

    • Pseudostratified columnar: location and function

    • Location: upper respiratory tract; epididymis

    • Function: secretes mucus/fluid; ciliated cells aid mucus movement

    • Stratified squamous: location and function

    • Location: digestive tract (stomach, esophagus), mouth, vagina; outer layer of skin

    • Function: protective barrier; resistance to abrasion

    • Stratified cuboidal: location and function

    • Location: sweat glands, salivary glands, mammary glands

    • Function: protective tissue; secretion

    • Stratified columnar: location and function

    • Location: lining of pharynx and salivary ducts

    • Function: protective tissue; secretion

    • Transitional: location and function

    • Location: bladder and ureter

    • Function: stretchable without rupture

  • Glandular epithelium: glands specialized for secretion/excretion

    • Endocrine glands: secrete directly into bloodstream; no ducts

    • Exocrine glands: secrete onto epithelial surfaces via ducts

  • Hormone transport concept (illustrated by a lipid-soluble vs water-soluble distinction):

    • Lipid-soluble hormones: typically diffuse across cell membranes and may require carrier proteins in blood

    • Water-soluble hormones: circulate freely or with carrier proteins and bind receptors on target cell surfaces

  • Practical note: epithelial tissues line surfaces and cavities and form glands; their structure supports their secretory/absorptive roles.

Connective Tissue

  • Primary roles: connect tissues, support, binding, transport, immunity, and energy storage

  • Major subtypes and examples:

    • Elastic tissue: contains kinked elastic fibers; returns to original shape after stretching

    • Collagenous (white fibrous) tissue: collagen as the main protein; provides tensile strength

    • Dense regular connective tissue: parallel collagen bundles; high tensile strength (e.g., tendons)

    • Dense irregular connective tissue: thick mat of fibers in multiple directions; provides strength in multiple directions

    • Areolar (loose) connective tissue: cushioning and flexibility throughout the body

    • Reticular connective tissue: fine reticular fibers forming a net-like scaffold for other cells; found in lymphoid organs (spleen, lymph nodes), bone marrow, liver, kidneys

    • Adipose tissue: fat storage; adipocytes store fat; nucleus displaced to one side in full adipocytes

    • Cartilage: firmer than fibrous tissue but not as hard as bone; chondrocytes are cartilage cells

    • Bone: highly specialized connective tissue with mineral storage and support; major function includes protection of organs, structural support, movement, hematopoiesis, and mineral storage

  • Cartilage types:

    • Hyaline cartilage: glass-like covering of bones within joints

    • Elastic cartilage: contains elastic fibers (e.g., external ear)

    • Fibrocartilage: found in intervertebral discs; strong with dense collagen

  • Bone composition and organization:

    • Composition: collagen, calcium, phosphorus

    • Major functions: protection of organs, support and mobility, hematopoiesis, mineral storage

    • Microstructure scales (illustrated):

    • Cortical bone

    • Osteocytes

    • Osteon

    • Lamella

    • Collagen fibers

    • Tropocollagen

    • Scale references: approximately

      • ~100 μm for an osteon size

      • ~1 μm for an osteocyte size

      • ~500 nm for collagen fibril components

      • ~1.5 nm for tropocollagen molecules

  • Practical note: connective tissues provide the framework that supports and integrates all tissues and organs of the body.

Muscle Tissue

  • General property: muscle tissue contracts to produce movement or maintain position

  • Three primary types:

    • Skeletal muscle:

    • Characteristics: striated, tubular, multinucleated fibers

    • Control: voluntary

    • Location: typically attached to skeleton via tendons; found throughout the body

    • Smooth muscle:

    • Characteristics: non-striated, spindle-shaped, single nucleus

    • Control: involuntary

    • Location: walls of blood vessels, digestive tract, respiratory tract, reproductive tract

    • Cardiac muscle:

    • Characteristics: striated, branched, single nucleus

    • Control: involuntary

    • Location: heart

Nervous Tissue

  • Function: coordinates and controls most body activities

  • Location: brain, spinal cord, nerves

  • Cellular component: neurons (nerve cells) as the primary functional units

The General Plan of the Animal Body: Potential Spaces and Serous Membranes

  • Definition: a potential space is an anatomical region where two adjacent membranes or structures are normally pressed together with no actual gap; a thin fluid film allows smooth gliding during movement

  • Examples of potential spaces:

    • Pleural cavity: between visceral pleura (lung covering) and parietal pleura (chest wall lining) within the thorax

    • Pericardial cavity: between parietal and visceral pericardium around the heart

    • Peritoneal cavity: between parietal and visceral peritoneum within the abdomen housing most abdominal organs

    • Subdural space: between dura mater and arachnoid mater in skull and spinal column

Additional Context and Recap from Learning Objectives

  • Reiterate systematic anatomy approach (Table 1-1 reference) to prepare for physiology

  • Emphasis on using anatomical terminology to label and describe directional anatomy in animals

  • Understanding the hierarchy of life sciences: cells → tissues → organs → organ systems

  • Epithelial tissue classification by structural differences and functional implications

  • Distinction and practical importance of endocrine vs. exocrine glands

  • Overview of connective tissue subcategories and their functions

  • Adipose tissue typical forms in adult animals

  • Primary functions and types of cartilage; forms of bone and their roles

  • Primary functions and locations of the three muscle tissue types

  • Labeling and understanding neuron structure and function

  • Concept of potential spaces and the serous membranes lining body cavities

Quick Reference: Key Terms and Concepts

  • Gross anatomy vs microscopic anatomy

    • Gross anatomy: visible with the naked eye

    • Microscopic anatomy: requires a microscope

  • Key directional terms (summary): Rostral, Caudal, Cranial, Dorsal, Ventral, Proximal, Distal, Medial, Lateral, Palmar, Plantar, Axial, Abaxial

  • Planes of division: Transverse, Median, Sagittal, Dorsal

  • Primary tissue types and roles: Epithelial (body coverings/linings; glands), Connective (support/structure), Muscle (movement), Nervous (control/coordination)

  • Systematic anatomy terms and chief structures (Table 1-1 overview)

  • Gland classifications: Endocrine (no ducts; hormones into bloodstream) vs Exocrine (ducts to surfaces)

  • Bone microstructure and scales (osteon, osteocytes, lamella, tropocollagen) and typical dimensions

  • Cartilage and bone functions with emphasis on protection, support, movement, and physiological roles

Quick Quiz Prompts (for self-testing)

  • What is the difference between endocrine and exocrine glands, and give an example of each?

  • Name the four primary tissue types and one key function for each.

  • List the three types of muscle tissue and one distinctive feature for each.

  • Describe the three cartilage types and one key location or function for each.

  • Explain what a potential space is and name two examples in the body.

  • Provide the hierarchical sequence from atoms to ecosystems and state the role of physiology within this hierarchy.

  • Identify the directional terms for: toward the head, toward the belly, toward the midline, and toward the tail in a quadruped.

Notes

  • Mathematical expressions used in this set are limited to anatomical scale references and hierarchical relationships. When present, all formulas or equations have been formatted in LaTeX as requested (e.g., the hierarchy of life sciences). If you need more detail on any specific slide or want additional diagrams converted to notes, tell me and I’ll expand.