Middle piece - structure of the sperm, Biology

Middle piece - Structure of the Sperm

Just behind the head, the small constriction (neck) carries a distal and a proximal centriole. The two lie at right angle to each other. The proximal centriole initiates the cleavage divisions of fertilized egg while the distal centriole provides attachment to axial filament of tail. The middle piece has mitochondria surrounding the base of the axial filament of the flagellum (tail). The mitochondria form compact and isolated clumps throughout the middle piece, or there may be a tightly coiled spiral of mitochondria around the proximal centriole of filament and distal centriole.

The mitochondria carry the oxidative enzymes responsible for oxidative phosphoryIation. Therefore, it is the 'power plant' supplying the energy to the flagellum to be used for propulsion of the sperm through the fluid medium. A dark ring is sometimes seen at the posterior end of the middle piece as a boundary between middle piece and the tail. It is known as 'ring centriole' but electron microscopic study reveals that the ring centriole does not resemble a centriole in its structure. Its origin and function are unknown.

Posted Date: 1/24/2013 6:23:55 AM | Location : United States







Related Discussions:- Middle piece - structure of the sperm, Assignment Help, Ask Question on Middle piece - structure of the sperm, Get Answer, Expert's Help, Middle piece - structure of the sperm Discussions

Write discussion on Middle piece - structure of the sperm
Your posts are moderated
Related Questions
As coenzymes participate in a variety of functions, they can be classified broadly into two groups: i)  Hydrogen transferring  coenzymes, and ii)  Group transferring coenzym

Giemsa stain is a basic stain, thus the major chromagen is positively charged (cation). Why does this stain have an affinity for the bacteria cell wall, and for certain cellular co

List specific reasons why the inflammatory response is considered a body defense mechanism.

How are metarterioles different from arterioles? Explain how fenestrated capillaries are different than continuous capillaries in terms of their structure and function.

The client was admitted to the hospital with hypertension (high blood pressure). The development of arteriosclerosis (plaque buildup in the arteries) has increased peripheral resis

EXAMPLES OF NATURAL SELECTION - 1 .       INDUSTRIAL MELANISM - First studied by Fischer & Ford (1845) on pepperd moth (Biston betularia) of two types : grey moth (B.

Periodic Variations in Light-Diurnal and Seasonal We know that rotation of the earth on its axis accounts for day-to-night variations in the amount of radiations falling at a g

draw a well labled diagram of plasmotomy

Explain The Estimated Average Intake (EAR)? Considering that the nutrient requirements follow a normal distribution, the EAR is defined as 'the median usual intake that meets t

Migration - Population Dispersal Dispersal is affected by the presence or absence of the barrier and vagility which means inherent power of movement also called dispersal powe