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
Define physiological effects of SCFA? The physiological effects of SCFA's can be summarized as follows. They: Lower the ph in the gastrointestinal tract, which in turn r

The foods we take have three basic ingredients - carbohydrate, protein and fat. Insulin has profound effects on the metabolisms of carbohydrate, protein and fat. Metabolism helps o

Define the Buffer capacity - Nutritional Biochemistry? Buffer capacity can be defined as, 'the capacity of a solution to resist changes in pH on the addition of strong acid or

Explain about the Oesoplzageal Carcinoma? Management of patients with oesophageal carcinoma includes surgery, radiation and combination chemotherapy. Radiation to the lower nec

What are some signs and symptoms found in patients with hyperthyroidism? The hormones made by the thyroid gland stimulate the basal metabolism of the body. In hyperthyroidism t

Define Types of Root Canal Perforations According To Causes Iatrogenic causes. Pathological causes.

Body Musculature - Locomotion The layout of the muscle layers surrounding the coelom is necessarily the same in all the major classes of Annelida. The body wall has a layer of

Explain the Biochemical Approach in Taxonomy Comparative biochemistry is being used increasingly in the systematic of animals, both for identification of organisms as well as f

Assessment   While assessing the patient with rheumatic fever, a detailed history including, problematic environmental factors or recent exposure to streptococcal infection is

Nature of Light - Floral Induction Red light promotes flowering in short day plants. If the dark regime of a short day plant is interrupted by red light, flowering is inhibite