Determination of limb polarities, Biology

Determination of Limb Polarities

The limb pattern is characterized by three axes (or polarities) as displayed in diagram:

 (1) The direction from the shoulder (or hip) to the digits is the proximal-distal (P-D) axis.

(2) The cranial (head) side of the limb is anterior and the caudal (tail) side is posterior. The direction from the former to the latter side is anterior-posterior (A-D) axis.

(3) The third axis is the dorsal-ventral (D-V) axis which indicates the direction from the upper (dorsal) to the lower (ventral) side of the limb.

In your own hand the thumb is anterior and little finger posterior. The back of the hand marks the dorsal and palm the ventral side. You should also notice that the respective contralateral forelimbs and hindlimbs develop as mirror images of each other. For example, your right hand and foot are mirror images of the left hand and foot, respectively.

Posted Date: 1/29/2013 6:03:30 AM | Location : United States







Related Discussions:- Determination of limb polarities, Assignment Help, Ask Question on Determination of limb polarities, Get Answer, Expert's Help, Determination of limb polarities Discussions

Write discussion on Determination of limb polarities
Your posts are moderated
Related Questions
I WANT JOB FOR TEACHING SCINCE SUBJECT FOR ONLINE

Compared to platyhelminthes which physiological problem have the cylindrical body of nematodes brought? How was that problem solved? The cylindrical shape of nematodes made imp

Define the Meaning of Goitrogens? Goitrogens are substances that interfere with iodide metabolism in any way that inhibits thyroid hormone synthesis. As a result, there is augm

Q. What are the major types of animal tissue? The major animal cell tissues are the epithelial tissue, the nervous tissue, the connective tissue and the muscle tissue.

Water Pollution Water is one of the most essential requirements for the survival of all living organisms. Water is used for household, agricultural, industrial and recreation

What are the types of evaluation of lateral earth forces acting on retaining structures? This section seeks to introduce you to the evaluation of lateral earth forces acting on

Is there anything I can do to keep my brain healthy in older age? It is increasingly clear that how we live our lives on a daily basis strongly influences how well our brain ag

Define Interpretation of blood or serum nutrient values in pregnancy? Interpretation of blood/serum nutrient values in pregnancy is therefore complex compared to the non-pregn

Give a detailed description of stereoblastula, please ?#

SHORT COMING OF CELL THEORY / EXCEPTIONS OF CELL THEORY (i)       Viruses can be considered as exception to cell theory. They are made of proteins and ones of nucleic acid i.e.