anatomy and physiology of animalsaevm.tamu.edu/files/2010/06/anatomy_and_physiology.pdf ·...
TRANSCRIPT
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Veterinary Science Preparatory Training for the Veterinary Assistant
Floron C. Faries, Jr., DVM, MS
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Anatomy & Physiology
of Animals
Floron C. Faries, Jr., DVM, MS
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Objectives
Define anatomy
Discuss the different fields of anatomy
Identify and describe the integumentary system
Identify and describe the musculoskeletal system
Identify and describe the cardiovascular system
Identify and describe the lymphatic system
Identify and describe the digestive system
Identify and describe the respiratory system
Identify and describe the endocrine system
Identify and describe the urinary system
Identify and describe the reproductive system
Identify and describe the nervous system and special senses
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Definitions
Anatomy
The study of the structures of living things
Physiology
The study of the functions of living things
Mechanical, physical, or biochemical
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Latin – Anatomy
“ana” “tome”
“ana” – again or go back
“tome” – to cut
“cut again” or “go back and cut”
The study of the structure of the animal body
and the relationships of its many parts
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Gross anatomy
Microscopic anatomy
Developmental anatomy
Applied anatomy
Fields of Anatomy
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Study of gross
anatomy
Systemically
Regionally
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Macroscopic Anatomy (gross anatomy)
Seen with the naked eye by dissection.
Organs and organ systems
Microscopic Anatomy
Viewed with a microscope.
Cytology: the study of cells
Histology: the study of the four basic
types of tissues
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ORGAN – Two or more types of tissues
e.g., skin, kidney, intestine, blood vessels
TISSUE – Groups of cells with same general function
e.g., muscle, nerve
CELL – Smallest unit of protoplasm
ORGAN SYSTEM – Several organs
e.g., respiratory, digestive, reproductive systems
CELL
TISSUE
ORGAN
SYSTEM
PROTOPLASM – Living Substance
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Four Basic Types of Tissue
EPITHELIUM TISSUE CONNECTIVE TISSUE
NERVOUS TISSUE MUSCULAR TISSUE
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Covers organs
Functions of Epithelium
Secretory cells of glands
Lines viscera and blood vessels
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Functions of Connective Tissue
Provides mechanical support.
Provides place for metabolite exchange.
Provides place for energy storage.
Provides place for inflammation.
Provides place for fibrosis – healing.
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Connective Tissue and Blood Cells
Red Cells Carry oxygen to and carbon dioxide
from the body’s tissues.
White Cells Manufactured in bone marrow.
Pass through the blood to connective tissue for defense.
Platelets Act in blood clotting.
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Function
Generates contractile force.
Muscular Tissue
Function
Provides transmission, reception, and integration of electrical impulses.
Nervous Tissue
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Organs
Definition: a distinct collection of two or more tissues
that performs a specific function or functions
Examples:
- bones
- brain
- liver
- kidney
- heart
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Organ Systems
Definition: a group of interconnected organs that
work together with a common purpose or purposes
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• Digestive
• Respiratory
• Urinary
• Reproductive
• Musculoskeletal
• Endocrine
• Nervous
• Integumentary
• Cardiovascular (circulatory)
• Lymphatic (immune)
Organ Systems
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Integumentary System
Epidermis
Outermost layer of skin
Dermis
Beneath the epidermis
Consists of connective
tissue
Hypodermis
Subcutis
Lowest layer of skin
Mainly houses fat
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Functions of Skin
Protects against injury and desiccation.
Maintains water balance.
Excretes various substances.
Provides thermoregulation.
Receives stimuli. Temperature
Pain
Pressure
Provides basis of recognition
of well-being.
Provides place for fat metabolism
in the hypodermis.
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Muscles: system of levers that aid muscle action
Smooth Muscle
Skeletal Muscle
Cardiac Muscle
Bones: provide support and protection
Long bones
Short bones
Flat bones
Irregular bones
Parts and Functions of the
Musculoskeletal System
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Parts and Functions of the
Musculoskeletal System
Joints
Form the junction between
two or more bones.
Cartilage
Forms cushion.
Ligaments
Connect bone to bone.
Tendons
Attach muscles to bone.
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Functions of Muscle
Produces contractibility (movement).
Running, walking, jumping
Produces posture.
Stabilizes joints.
Produces heat.
Flexion (close angle of joint) and
Extension (open angle)
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Functions of Cartilage
Provides flexible support.
(ears, nose, and respiratory)
Slides across each other.
(joints)
Provides a cushion.
(joints)
No nerves, so no pain
during compression
of cartilage.
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Functions of Bone
Provides skeletal support. Provides protective enclosure.
Skull to protect brain. Long bone to protect blood producing cells.
Regulates calcium. Provides place for hemopoiesis.
Blood cell formation in the body
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Skeleton of the “hand”
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Carpal bones
Metacarpal bones
Phalanges (Digits) 1
2 3 4
5
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Carpal bones
Metacarpal bones
Phalanges
1
2
3 4
5
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Carpal bones
Metacarpal bones
Phalanges 2
3 4
5
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Carpal bones
Metacarpal bones
Phalanges
3 4
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Carpal bones
Metacarpal bones
Phalange
3
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Cardiovascular System
Heart
Arteries
Veins
Capillaries
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Parts and Functions of the
Cardiovascular System Heart Produces blood pressure
during systole.
Elastic arteries Conduct blood and maintain
pressure during diastole.
Muscular arteries
Distribute blood and maintain pressure.
Arterioles Provide peripheral resistance.
Distribute blood.
Capillaries Exchange nutrients and
waste.
Venules Collect blood and edema
from capillaries.
Veins Transmit blood to large
veins. (reservoir)
Large veins Receive lymph and return
blood to heart. (reservoir)
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Closed Loop with
Pressure Drop
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125
30 15
2
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Heart
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base
apex
atria
ventricles
RA LA
RV LV
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interatrial
septum
interventicular
septum
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R. atrioventicular
orifice
L. atrioventricular
orifice
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R. AV valve (tricuspid valve)
L. AV valve (mitral valve)
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chordae tendineae chordae tendineae
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aorta
pulmonary trunk
pulmonary valve aortic valve
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O2
Press. (2mmHg)
O2
Press. (3mmHg)
Systole
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0mmHg 0mmHg
Diastole
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Systole
25mm
25/8
125mm
125/80
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Lymphatic System
Returns fluid from the
tissues to the
circulatory system.
Consists of:
Lymph
Lymphatic vessels
Lymphatic structures
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Parts and Functions of the
Lymphatic System
Lymph nodes Filters and traps foreign particles.
Contain white blood cells.
Tonsils Protects against bacteria.
Thymus Helps with immunologic cells.
Spleen Clears out old red blood cells.
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Functions of the Lymphatic System
Removes excess fluids from body tissues.
Absorbs fatty acids.
Transports fat.
Produces immune cells (lymphocytes).
Helps combat infections.
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Digestive System
Involves Prehension
Digestion
Absorption of food
Elimination of solid waste material
Parts Oral cavity
Esophagus
Stomach (gastro)
Small intestines
Large intestines
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Functions of the Gastro-Intestinal Tract
(G-I Tract)
Moves food.
Secretes of digestive juices.
Absorbs digested foods,
water, and electrolytes.
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Stomach of Ruminants
Four chambers
Rumen
Reticulum
Omasum
Abomasum
Stomach of Monogastrics
Single stomach
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Parts of the Respiratory System
For conducting air:
Nasal cavity
Nasopharynx
Larynx
Trachea
Bronchi
Bronchioles
For exchanging gas:
Alveoli
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Functions of the Respiratory System
Includes inspiration and expiration.
Provides an exchange of respiratory
gases.
(oxygen and carbon dioxide)
Warms, cleans, and humidifies air.
Aids olfaction and phonation.
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Reproductive System
Functions of the reproductive system
Provides process for reproduction.
Production of offspring
Parts of the reproductive system
Female animals
Male animals
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Parts of the Urinary System
Kidneys
Urinary bladder
Ureters
Urethra
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Functions of the Urinary System
Absorbs metabolites.
Storages urine temporarily.
Eliminates urine.
Excretes waste products.
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Parts of the Endocrine System
Pituitary gland
Thyroid gland
Parathyroid glands
Adrenal glands
Related parts:
Pancreas
Gonads
Placenta
G-I tract
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Functions of the Endocrine System
Releases hormones.
Regulates metabolism.
Regulates growth/development.
Regulates tissue function.
Regulates mood.
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Parts of the Nervous System
Central nervous system
Brain
Spinal cord
Peripheral nervous system
Somatic nerves
Automatic nerves
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Functions of the Nervous System
Controls functions and movement of:
Organs
Muscles
Sensory organs
Neurons relay and receive information.
Neurons conduct electrochemical signals.
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The Central Nervous System (CNS)
The Brain
The central information
processing organ of the
body
The Spinal Cord
Long, thin tubular bundle of
nerves
Connected to the brain
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The Peripheral Nervous System
Somatic Nerves Control voluntary muscles that
provide movement.
Autonomic Nerves Control involuntary responses.
(smooth muscle, cardiac
muscle, glands, and organs)
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Special Systems
The Eye (sight)
The Ear (hearing and balance)
The Tongue (taste)
The Nasal Cavity (smell)