Lab 1

similarity of form or arrangement on either side of a dividing line or plane

• four:
• asymmetry, spherical, radial, bilateral

• any line or plane through the center does not result in equivalent parts
• ex: protists

• al lines or planes passing through the center result in the same two equivalent parts
• (many objects like basketablls and some protists [some algae[)

• any cut passing through the center results in two halves that are essentially idental; cuts usually through the medial axis which pass through the mouth of hte organism; the object or organism doesn't have radial symmetry as viewed from teh side
• ex: cylinder, starfish, etcl

• most common in animal kingdom
• only one cut that can be made which will yield two essentially alike peices; vertical cut that passes through the center of the organism or object and extends the length of the organism or object

surface passing through the body that divides it into two parts

• median (midsagittal)
• sagittal
• parasagittal
• frontal/ coronal
• cross

• vertical longitudinal plane passing through the organism
• divides organism into two essentially identical halves, right and left

any vertical longitudinal plane through the organism that is the median plane or any plane parallel to it

sagittal planes other than the median plane

any longitudinal plane which occurs at right angles to the sagittal plane

any plane or section that is at right angles to both the sagittal and frontal planes

• radial
• tangential
• cross

any plane or section that passes through teh center adn along the central axis; infinite number of cuts that can be made, all of which result in two identical portions

any plane or section that is parallel to the central axis but does not pass through the center

a plane or section at right angles to the radial and tangential planes

orientation

• superior and inferior (not four-legged animals)
• cranial and caudal (all animals with brain case and tail, respectively)
• anterior and posterior (part of body that goes forward or backward in locomotion)

• Dorsal and Ventral
• Anterior and Posterior

• medial and lateral
• central and peripheral (spheroidal part or organ)
• superficial and deep

proximal and distal