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
Explain Echinocandins It inhibit synthesis of β (1,3)-D-glucan, an essential component of the fungal cell wall. The potential for adverse effects in humans is low because of th

Q. How different are animal cells from plant cells? While plant cells are eukaryotic, photosynthetic, autotrophic and have chloroplasts and cell wall, the animal cells are hete

Explain about Battery Battery:  Two electrodes (zinc and carbon) placed in electrolyte (dilute sulfuric acid).  Chemical reactions in electrolyte force positive charges to

show heading wise characteristics of phylum platyhelmenthiese

Q. Observation of Hemichordata ? • identify Balanoglossus as a hemicliordate and give its scientific and common name. • classify Balanogiossus LIP to the level of order.

Is crossing over important for the diversity of biological evolution? The Sexual reproduction and the recombination of linked genes (crossing over) are, along with mutations, t

Myeloid immunodeficiency causes phagocytic function, which is impaired. Those who are affected with this will undergo with enhance in susceptibility to bacterial infection.

Define Titrimetric Estimation of Carbohydrates? The Fehling's Soxhlet method is the commonly used method for titrimetric estimation of carbohydrates. In the following section y

Given an individual who is heterozygous at 6 loci, how many different gametic Genotypes are possible? A. 36 B. 12 C. 32 D. 48 E. 64

Define Factors Contribute to the Malabsorption - Radiation Damage? Malabsorption of water, fats, bile salts, carbohydrates, calcium, magnesium, iron and vitamin B 12 occur dur