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Human Anatomy, First EditionMcKinley & O'Loughlin

Chapter 1 Lecture Outline: A First Look at Anatomy

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A First Look at Anatomy

Anatomy is the study of structure. The word anatomy is derived from

Greek and means “to cut up” or “to cut open.” Anatomists examine the relationships

among parts of the body along with the structure of individual organs.

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Introduction to Anatomy

Physiology The scientific discipline that studies

the function of body structures. Structure and function cannot be

completely separated. Form is related to function.

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Levels of Organization in the Human Body

The simplest level of organization within the body is the chemical level, which is composed of atoms and molecules. Atoms are the smallest units of

matter.

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Levels of Organization in the Human Body

Molecules Two or more atoms combine to form a

molecule, such as a protein, a water molecule, or a vitamin.

Macromolecules Larger and more complex molecules

such as DNA and proteins.

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Levels of Organization in the Human Body

At the cellular level, specialized structural and functional units called organelles permit all living cells to share some common functions.

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Levels of Organization in the Human Body

Large molecules join in specific ways to form cells, the basic units of structure and function in organisms. The cell is the smallest structural unit

that exhibits the characteristics of living things (organisms), and it is the smallest living portion of the human body.

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Levels of Organization in the Human Body

Tissues Groups of similar cells with a common

function form tissue. Tissues are precise organizations of

similar cells that perform specialized functions.

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Levels of Organization in the Human Body Organs

Different tissue types that work together to perform specific, complex functions form an organ.

Organ Systems The organ system level consists of related

organs that work together to coordinate activities and achieve a common function.

There are 11 organ systems in the human body.

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Levels of Organization in the Human Body

Organism All body systems function

interdependently in a single living human being, the organism.

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The Four Types of Tissues in the Human Body Are:

Epithelial tissue covers exposed surfaces and lines body cavities.

Example: The inner lining of the digestive system

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The Four Types of Tissues

Connective tissue protects, supports, and interconnects body parts and organs.

Can be solid (such as bone), liquid (such as blood), or intermediate (such as cartilage).

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The Four Types of Tissues

Muscle tissue produces movement.

Skeletal muscle Smooth muscle Cardiac muscle

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The Four Types of Tissues

Nervous tissue conducts impulses for internal communication.

Brain, spinal cord, and nerves

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Integumentary Provides protection

Regulates body temperature

Site of cutaneous receptors

Synthesizes vitamin D

Prevents water loss

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Skeletal Provides support

and protection Site of

hematopoeisis (blood cell production)

Stores calcium and phosphorus

Allows for body movement

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Muscular Produces body

movement Generates heat

when muscles contract

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Nervous A regulatory system

that controls body movement Responds to sensory

stimuli Helps control all

other systems of the body

Also responsible for consciousness, intelligence, memory

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Endocrine Consists of glands

and cell clusters that secrete hormones, some of which regulate

body and cellular growth

chemical levels in the body

reproductive functions

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Cardiovascular

Consists of a pump (the heart) that moves blood through blood vessels in order to distribute hormones, nutrients, gases, and pick up waste products

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Lymphatic Transports and

filters lymph (interstitial fluid) Initiates an

immune response when necessary

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Respiratory Responsible for

exchange of gases (oxygen and carbon dioxide) between blood and the air in the lungs

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Digestive Mechanically and

chemically digests food materials Absorbs nutrients Expels waste

products

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Urinary Filters the blood

and removes waste products from the blood Concentrates

waste products in the form of urine, and expels urine from the body

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Male Reproductive System

Produces male sex cells (sperm) and male hormones (e.g., testosterone) Transfers

sperm to the female

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Female Reproductive System

Produces female sex cells (oocytes) and female hormones (e.g., estrogen and progesterone)

Receives sperm from male Site of fertilization of

oocyte Site of growth and

development of embryo and fetus

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AnatomicalTerminology

Anatomic position is a specific body position in which an individual stands upright with the feet parallel and flat on the floor.

The head is level, and the eyes look forward toward the observer.

The arms are at either side of the body with the palms facing forward and the thumbs pointing away from the body.

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Anatomical Terminology

A plane is an imaginary surface that slices the body into specific sections.

The three major anatomic planes of reference are the coronal, transverse, and sagittal planes.

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Sectionsand Planes

A coronal plane, also called a frontal plane, is a vertical plane that divides the body into anterior (front) and posterior (back) parts.

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Sectionsand Planes

A transverse plane, also called a cross-sectional plane or horizontal plane, cuts perpendicularly along the long axis of the body or organ separating it into both superior (upper) and inferior (lower) parts.

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Sectionsand Planes

A sagittal plane or median plane, extends through the body or organ vertically and divides the structure into right and left halves.

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Sections and Planes A sagittal plane in the body midline is a

midsagittal plane. A plane that is parallel to the

midsagittal plane, but either to the left or the right of it, is termed a parasagittal (or sagittal) plane.

A minor plane, called the oblique plane, passes through the specimen at an angle.

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Directional Terms of the Body

Directional terms are precise and brief, and for most of them there is a correlative term that means just the opposite.

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Relative and Directional Terms of the Body Relative to front (belly

side) or back (back side) of the body :

Anterior = In front of; toward the front surface

Posterior = In back of; toward the back surface

Dorsal =At the back side of the human body

Ventral = At the belly side of the human body

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Relative and Directional Terms of the Body Relative to the

head or tail of the body:

Superior = Toward the head or above

Inferior = Toward feet not head

Caudal = At the rear or tail end

Cranial = At the head end

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Relative and Directional Terms of the Body Relative to the midline

or center of the body: Medial = Toward the

midline of the body Lateral = Away from

the midline of the body Deep = On the inside,

underneath another structure

Superficial = On the outside

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Relative and Directional Terms of the Body Relative to point of

attachment of the appendage: Proximal =

Closest to point of attachment to trunk

Distal = Furthest from point of attachment to trunk

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Body Regions The human body is partitioned into

two main regions, called the axial and appendicular regions. the axial region includes the head,

neck, and trunk which comprise the main vertical axis of our body

our limbs, or appendages, attach to the body’s axis and make up the appendicular region

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Body Cavities

and Membranes The posterior

aspect of the body has two enclosed cavities

A cranial cavity is formed by the cranium and houses the brain.

A vertebral canal is formed by the individual bones of the vertebral column and contains the spinal cord.

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Body Cavities Both the thoracic and abdominopelvic

cavities are lined with thin serous membranes, which are composed of two layers: A parietal layer lines the internal surface of

the body wall. A visceral layer covers the external surface

of organs (viscera) within the cavity. Between the parietal and visceral layers of the

serous membrane is a thin serous cavity, containing a lubricating film of serous fluid.

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Body Cavities and Membranes

Constant movement of the organs causes friction.

The serous fluid reduces friction and helps the organs move smoothly against both one another and the body wall.

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Body Cavities and Membranes

The median space in the thoracic cavity is called the mediastinum.

It contains the heart, thymus, esophagus, trachea, and major blood vessels that connect to the heart.

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Body Cavities and Membranes

Within the mediastinum, the heart is enclosed by a two-layered serous membrane called the pericardium.

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Insert Fig 1.9d

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The Thoracic Cavity The right and left sides of the

thoracic cavity contain the lungs; they are lined by a two-layered serous membrane called the pleura. The outer layer is the parietal pleura; it lines

the internal surface of the thoracic wall The inner layer is the visceral pleura; it

covers the external surface of the lung The narrow, moist, potential space between

them is called the pleural cavity

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Abdominopelvic Cavity

The abdominopelvic cavity consists of an abdominal cavity and a pelvic cavity.

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The Abdominopelvic Cavity The peritoneum

is a moist, two-layered serous membrane that lines the abdominopelvic cavity.

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Insert figure 1.9d

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Abdominopelvic Regions

The abdominopelvic cavity is partitioned into 9 smaller, imaginary compartments.