Chapter 1. Study Guide

Body Regions and Anatomical Terms

Major Body Regions

Understanding anatomical terminology is essential for accurately describing locations and relationships of body structures. The following terms are commonly used to refer to specific regions of the human body:

• Lumbar: Refers to the lower back region, between the ribs and pelvis.

• Acromial: Pertains to the point of the shoulder.

• Scapular: Relates to the shoulder blade area.

• Popliteal: Refers to the area behind the knee.

• Occipital: Pertains to the back of the head.

Example: In Figure 1.1, the labeled regions correspond to these anatomical terms:

Label	Region
A	Occipital
B	Acromial
C	Scapular
D	Lumbar
E	Popliteal

Planes and Directions in Anatomy

Anatomical Planes

Anatomical planes are imaginary lines that divide the body into sections, aiding in the study and description of body parts and movements.

• Transverse Plane: Divides the body into superior (upper) and inferior (lower) parts. A transverse plane could cut the head off the body.

• Coronal (Frontal) Plane: Divides the body into anterior (front) and posterior (back) sections. A coronal section can pass through both ears

• Sagittal Plane: Divides the body into right and left parts. The midsagittal plane divides the body into equal right and left halves.

• Respectively: superior and inferior parts

Directional Terms

Directional terms describe the positions of structures relative to other structures or locations in the body.

• Proximal: Closer to the point of attachment or to a given reference point. Ex: The elbow is proximal to the wrist.

• Distal: Farther from the point of attachment or from a given reference point. Ex: The knee is distal to the thigh. The toes are distal to the ankle.

• Lateral: Away from the midline of the body. Ex: The thumb is lateral to the pinky.

• Medial: Toward the midline of the body. Ex: The heart is medial to the lungs. The little finger is medial to the thumb.

• Superior (cranial Cavity): Above or toward the head. Ex: The head is superior to the abdomen

• Inferior: Below or toward the feet. Ex: The intestines are inferior to the liver.

• Anterior (Ventral Cavity): Toward the front of the body. Ex: The sternum is anterior to the heart.

• Posterior (Dorsal Cavity): Toward the back of the body. Ex: The vertebra is posterior to the heart

• Deep (internal): Away from the body surface; more internal. Ex: The lungs are deep to the skin

Example: The lip is superior to the chin.

Body Cavities and Membranes

• VENTRAL BODY CAVITY consists of ( Thoracic cavity, abdominopelvic cavities)

Serous Membranes - Makes a sterile cavity and surrounds the heart

Serous membranes are thin tissues that line body cavities not open to the outside and cover the organs within these cavities. They secrete serous fluid to reduce friction between moving organs. They reduce friction so that viscera move freely.

• Function: Reduce friction, act as protective wrapping, and help prevent the spread of infection.

• Examples: Pericardium (heart), pleura (lungs), peritoneum (abdominal organs).

• Visceral Serosa: Covers organs within the cavities.

• Parietal Serosa: Lines the cavity walls.

Example: The lungs are covered by visceral serosa, but the limbs are not.

Levels of Organization- Hierarchy of Structural Organization

Structural Organization

The human body is organized into increasing levels of complexity:

• Chemical Level: Atoms and molecules. The least complex level of organization. Molecules

• Cellular Level: Cells, the basic unit of life. Cells

• Tissue Level: Groups of similar cells performing a common function. Tissues

• Organ Level: Structures composed of two or more tissue types. Organs

• Organ System Level: Groups of organs working together. Organ System

• Organismal Level: The complete living being. Organism

Example: A group of cells with similar structure and function is called a tissue.

Types of Anatomy

Branches of Anatomy

Different branches of anatomy focus on various aspects of body structure and development:

• Developmental Anatomy: Studies structural changes throughout life.

• Pathological Anatomy: Examines structural changes caused by disease.

• Regional Anatomy: Focuses on specific areas of the body.

• Surface Anatomy: Studies external features and landmarks. Clinicians use this to locate blood vessels to draw blood.

Organ Systems and Physiology

Integumentary System

The integumentary system is composed of skin, hair, and nails. It protects the body, regulates temperature, and provides sensory information.

Physiology

Physiology is the study of the function of body parts and how they work together to maintain life.

Biochemical Compounds in the Body

Major Types and Building Blocks

The body contains four general types of biochemical compounds:

• Carbohydrates: Building blocks are monosaccharides (simple sugars).

• Lipids: Building blocks are fatty acids and glycerol.

• Proteins: Building blocks are amino acids.

• Nucleic Acids: Building blocks are nucleotides.

Sample Table: Anatomical Regions and Corresponding Terms

Region	Description
Axillary	Armpit area
Popliteal	Back of the knee
Scapular	Shoulder blade
Acromial	Point of the shoulder
Lumbar	Lower back
Occipital	Back of the head

Additional info:

• In anatomical position, the body stands upright, facing forward, with arms at the sides and palms facing forward.

• Serous cavities contain serous fluid, which reduces friction.

• The perineal region is the area between the genitals and the anus.

• The thoracic cavity contains the heart and the lungs, it is divided into right and left parts by the mediastinum.

• The axial region, so named because it makes up the main axis of the body, consists of the head, neck, and trunk.

• Clinicians refer to surface anatomy when locating blood vessels to draw blood

• Anatomical names for anterior leg - crural, anterior elbow - antecubital, posterior leg - sural (calf), ear regions - otic

• The axillary regions refers to the armpit.

• The sternum is the your breastbone — the flat, elongated bone located in the center of your chest, right between the left and right sides of the rib cage.

• The integumentary system is composed of skin, hair, and nails.

• Anatomy is the study of the structure of the human body.

• Physiology is the study of body function

• A group of cells with similar structure and function is called a tissue