atom: smallest unit of matter

abdominopelvic cavity: division of the anterior (ventral) cavity that houses the abdominal and pelvic viscera

anatomical position: standard reference position used for describing locations and directions on the human body

anatomy: science that studies the form and composition of the body’s structures

anterior cavity: larger body cavity located anterior to the posterior (dorsal) body cavity; includes the serous membrane-lined pleural cavities for the lungs, pericardial cavity for the heart, and peritoneal cavity for the abdominal and pelvic organs; also referred to as ventral cavity

anterior: describes the front or direction toward the front of the body; also referred to as ventral

caudal: describes a position below or lower than another part of the body proper; near or toward the tail (in humans, the coccyx, or lowest part of the spinal column); also referred to as inferior

cell: smallest independently functioning unit of all organisms; in animals, a cell contains cytoplasm, composed of fluid and organelles

computed tomography (CT): medical imaging technique in which a computer-enhanced cross-sectional X-ray image is obtained

cranial cavity: division of the posterior (dorsal) cavity that houses the brain

cranial: describes a position above or higher than another part of the body proper; also referred to as superior

deep: describes a position farther from the surface of the body

distal: describes a position farther from the point of attachment or the trunk of the body

dorsal cavity: posterior body cavity that houses the brain and spinal cord; also referred to the posterior body cavity

dorsal: describes the back or direction toward the back of the body; also referred to as posterior

frontal plane: two-dimensional, vertical plane that divides the body or organ into anterior and posterior portions

gross anatomy: study of the larger structures of the body, typically with the unaided eye; also referred to macroscopic anatomy

inferior: describes a position below or lower than another part of the body proper; near or toward the tail (in humans, the coccyx, or lowest part of the spinal column); also referred to as caudal

lateral: describes the side or direction toward the side of the body

magnetic resonance imaging (MRI): medical imaging technique in which a device generates a magnetic field to obtain detailed sectional images of the internal structures of the body

medial: describes the middle or direction toward the middle of the body

microscopic anatomy: study of very small structures of the body using magnification

molecule: formed from the chemical bonds that link two or more atoms

organ system: group of organs that work together to carry out a particular function

organism: living being that has a cellular structure and that can independently perform all physiologic functions necessary for life

organ: functionally distinct structure composed of two or more types of tissues

pericardium: sac that encloses the heart

peritoneum: serous membrane that lines the abdominopelvic cavity and covers the organs found there

physiology: science that studies the chemistry, biochemistry, and physics of the body’s functions

plane: imaginary two-dimensional surface that passes through the body

pleura: serous membrane that lines the pleural cavity and covers the lungs

positron emission tomography (PET): medical imaging technique in which radiopharmaceuticals are traced to reveal metabolic and physiological functions in tissues

posterior cavity: posterior body cavity that houses the brain and spinal cord; also referred to as dorsal cavity

posterior: describes the back or direction toward the back of the body; also referred to as dorsal

prone: face down

proximal: describes a position nearer to the point of attachment or the trunk of the body

regional anatomy: study of the structures that contribute to specific body regions

sagittal plane: two-dimensional, vertical plane that divides the body or organ into right and left sides

section: in anatomy, a single flat surface of a three-dimensional structure that has been cut through

serosa: membrane that covers organs and reduces friction; also referred to as serous membrane

serous membrane: membrane that covers organs and reduces friction; also referred to as serosa

spinal cavity: division of the dorsal cavity that houses the spinal cord; also referred to as vertebral cavity

superficial: describes a position nearer to the surface of the body

superior: describes a position above or higher than another part of the body proper; also referred to as cranial

supine: face up

systemic anatomy: study of the structures that contribute to specific body systems

thoracic cavity: division of the anterior (ventral) cavity that houses the heart, lungs, esophagus, and trachea

tissue: group of similar or closely related cells that act together to perform a specific function

transverse plane: two-dimensional, horizontal plane that divides the body or organ into superior and inferior portions

ultrasonography: application of ultrasonic waves to visualize subcutaneous body structures such as tendons and organs

ventral cavity: larger body cavity located anterior to the posterior (dorsal) body cavity; includes the serous membrane-lined pleural cavities for the lungs, pericardial cavity for the heart, and peritoneal cavity for the abdominal and pelvic organs; also referred to as anterior body cavity

ventral: describes the front or direction toward the front of the body; also referred to as anterior

X-ray: form of high energy electromagnetic radiation with a short wavelength capable of penetrating solids and ionizing gases; used in medicine as a diagnostic aid to visualize body structures such as bones