Exam 1 The Body Plan Flashcards
Postcranial Skeleton
Everything else: the vertebrae, ribs and limb bones.
Axial Skeleton
Portions of the post-cranial skeleton that comprise the main axial or trunk of the body.
Includes the vertebrae, ribs, and sternum.
Appendicular Skeleton
Composed of the appendages or limbs.
Ventral
The belly or underside of a body.
Ex: The naval is ventral to the spine.
Cranial
Towards the head.
Ex: The heart is cranial to the liver.
Caudal
Closer to the tail than another structure.
Ex: the hip (pelvis) is caudal to the ribs.
Dorsal
Towards the back.
Ex: The spine is dorsal to the breast bone (sternum).
Proximal
Closer to the point of attachment (origin) to the body than another structure.
Ex: the femur or thigh bone is the proximal bone of the rear leg.
Distal
Farther from the point of attachment to the body than another structure.
Ex: the phalanges (bones of the digit) (fingers) are distal to the carpal bones (carpals)(wrist).
Planes
Are imaginary lines that are used descriptively to divide the body into sections , making it possible to “look inside” and observe the structures of the body.
Dorsal plane
Plane that divides the body into dorsal (back) and ventral (belly) parts.
Also called the FRONTAL an CORONAL planes.
Transverse plane
Divides the body into cranial and caudal parts.
It is also called the horizontal plane or cross sectional plane.
Sagittal plane
A vertical plane that divides the body into right and left sides.
If plane passes the midline of the body and divides it into equal right and left sides, is called a MIDSAGITTAL (MEDIAN) PLANE.
If it doesn’t pass through the midline and divides the body unequally right and left is called PARASAGITTAL PLANE.
Body cavity
Is a hole or hollow space within the body that contains, protects, separate, and support internal organs.
Cranial Skeleton
Consists of the cranium, the mandibles, hyoids (supports the tongue).