Planes, Body Cavities, Membranes, and Directional Terms
Anatomy
The study of structure
Physiology
The study of function
Medial/mid-sagittal plane
Divides left and right into equal sections
Sagittal plane
Divides left and right into unequal sections
Transverse plane
Divides upper and lower (superior and inferior) into equal or unequal sections
Frontal plane
Divides front and back (anterior and posterior) into equal or unequal sections
Cranial cavity
The head
Optic/orbital cavity
The eyes
Nasal cavity
The nose
Oral cavity
The mouth
Pleural cavity
The lungs
Pericardial cavity
The heart
Thorasic cavity
The chest (thorax)
Diaphragm
Between the chest (thorax) and the abdomen, separating the two regions
Abdominopelvic cavity
The abdomen
Abdominal cavity
The upper abdomen; within the abdominopelvic cavity
Pelvic cavity
The lower abdomen (pelvis); within the abdominopelvic cavity
Anterior/ventral cavity
The front of the body
Posterior/dorsal cavity
The back of the body
Axial region
The core and the head; vital organs
Appendicular regions
The arms and the legs; appendages
Purpose of membranes
To line and help protect organs in the body
Contents of serous membranes
The visceral (inner) and parietal (outer) membranes
Types of serous membranes
Pleural (surrounds the lungs), pericardium (surrounds the heart), and peritoneum (surrounds all other organs)
Purpose of serous fluid
To reduce friction between the organ and other membranes/organs
Proximal
Closer to the point of attachment; only used for describing locations on the appendages
Distal
Farther from the point of attachment; only used for describing locations on the appendages
Medial
Closer to the midline
Lateral
Closer to the side
Bilateral
Two organs closer to the side; only used for paired organs
Superficial
Closer to the surface (skin); shallow
Deep
Closer to the internal organs; farther in
Superior
Above
Inferior
Below
Cephalic
Closer to the head
Caudal
Farther from the head