Electronic address: huabzh nwafu. Males of Panorpodidae possess a special sperm pump, through which they directly transfer seminal fluid to the female spermatheca. However, the sperm pump has not been studied in Panorpodes to date. Here, the structure of the sperm pump and the internal coupling of genitalia were investigated in the short-faced scorpionfly Panorpodes kuandianensis Zhong, Zhang, and Hua, using light and scanning electron microscopy. The sperm pump mainly consists of a piston, a pumping chamber, the anterior region of the aedeagal complex, the posterior region of the ejaculatory sac, and associated muscles.
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When enough stimulation trips arousal over into orgasm, it also triggers a storm of activity in the three ejaculatory centers deep in the brain. These areas, in the hypothalamus and the midbrain, fire off a pattern of impulses to coordinate the release of sperm from the testes, the creation of semen, and tie the final contractions tossing semen out of the body to the feelings of orgasm. Before the spurting can begin, sperm need to be brought out of storage and put in position.
Instead, smooth muscles in the walls of male reproductive organs contract in a coordinated wave. The conveyor-belt like movement takes concentrated masses of sperm from the epididymis where they matured and dumps them into the urethra at the base of the penis. Along the way, they pass by a series of glands like the seminal vesicles and the prostate which each squeeze out specialized fluids that dilute the sperm and create the complex goo we call semen.
Semen accumulates at the back end of the penis, inside the base of an erectile structure called the corpus spongiosum or in older papers, the corpus cavernosum urethrae. The corpus spongiosum is the odd man out of the three erectile structures inside the penis: unlike the two erection-producing corpora cavernosa that run alongside it, the corpus spongiosum is softer and flares at its tip to form the glans. Its base also swells slightly, forming a structure called the urethral bulb.
The urethra plunges into the middle of the bulb in a sort of turducken of sexual tissues: urethra at the center, erectile tissue surrounding it, all wrapped in layers of muscle. As semen fills the urethra, pressure starts to build in the bulb. The muscular conveyor belt from the reproductive ducts keeps pushing more fluid forward, and the bladder prevents back-flow by sealing its opening into the urethra. With nowhere else to go, the semen inflates the urethral bulb like a water balloon.
This is the point at which wads are shot, loads are dropped, rocks are shot off. The euphemisms are telling: the main event— expulsion —is completely involuntary, a reflex run by the spinal cord, no brain input needed. Once triggered, their signals take control of the muscles at the base of the penis and touch off a series of strong involuntary contractions.
One of the muscles in question, the bulbospongiosus also called the bulbocavernosus in old texts , surrounds the entire urethral bulb and the rear of the corpus spongiosum.
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A prerequisite for the sperm cell's difficult journey from the testicle to the fallopian tube is its unique sodium-potassium pump. New studies of the unique pump show how it differs from the sodium-potassium pumps in the rest of the body, and gives hints on why sperm cells have developed their own pump.
Most cells in the body sit in one place — the environment and the neighbours are well known, and the blood provides a constant supply of nutrients. The sperm, on the other hand, must go on a dangerous journey from the testicle to the fallopian tube, where it is challenged by significant fluctuations in temperature, pH and salt composition. Photo: Colourbox Kiyoshi Takahase Segundo. Which of the human organs is the most specialised and unique?
The sperm cells do have unique characteristics and challenges — firstly, they must halve their genetic material and, secondly, a successful sperm must make a long, strenuous journey in a foreign organism. Sodium-potassium pumps are found in all cells and are essential for all organs — so why do sperm cells have their own version of the pump? The sodium-potassium pump keeps track of the ions inside and outside the cell, and the balance of ions is used to drive a variety of other cellular processes.
Just as the electricity supply in a house is needed to run the refrigerator, vacuum cleaner and television, many different systems at the cellular level are driven by the energy that lies in the balance of ions. You need fuel to drive a pump and, in the cells, the fuel is called ATP. But sperm cells in particular must be economical with their ATP as they have a limited amount.
When conditions are good, they pump a lot, and when conditions are challenging, they pump only a little. The researchers therefore suggest that a pump with a good, regular activity can be sufficiently efficient when needed, as earlier in the journey under light conditions, it has not burned all its energy stores on pumping. However, a powerful blood-testis barrier makes it difficult to get drugs to reach the sperm. Before the pill for men becomes a reality, a solution for how to get the drug to the sperm must therefore be found.
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