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Related Concept Videos

Sperm Structure and Semen Composition01:22

Sperm Structure and Semen Composition

During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
Spermatogenesis01:41

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...
Sperm Transport01:15

Sperm Transport

The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
The maturation phase occurs in the epididymis, where sperm...
Accessory Glands of the Male Reproductive System01:16

Accessory Glands of the Male Reproductive System

The accessory ducts involved in sperm maturation and transportation include the epididymides, vasa deferentia, ejaculatory ducts, and urethra. These ducts play a critical role in the maturation, storage, and transportation of sperm from the testes to the urethra, where it is then released during ejaculation.
The epididymis is a small, comma-shaped organ located at the back of each testicle. The epididymis can be divided into three main parts: the head, body, and tail. The head of the epididymis...
Infertility in Males01:23

Infertility in Males

Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...
Male Sexual Response: Erection & Ejaculation01:17

Male Sexual Response: Erection & Ejaculation

Sexual stimulation can take various forms, such as physical touch and visual or auditory cues. When this happens, the parasympathetic reflex in the sacral portion of the spinal cord is activated. This reflex stimulates the release of nitric oxide (NO), which then dilates the arterioles in the penis, increasing blood flow to the erectile tissues - the corpora cavernosa and corpus spongiosum.
The blood filling the erectile tissues compresses the veins, which helps to prevent blood from leaving...

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Effect of Male Accessory Gland Products on Egg Laying in Gastropod Molluscs
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Published on: June 22, 2014

Tactic-specific differences in seminal fluid influence sperm performance.

Lisa Locatello1, Federica Poli, Maria B Rasotto

  • 1Department of Biology, University of Padova, Via U. Bassi 58/B, 35121 Padova, Italy.

Proceedings. Biological Sciences
|February 1, 2013
PubMed
Summary
This summary is machine-generated.

Seminal fluid significantly impacts sperm competition, with grass goby seminal fluid enhancing rival sperm performance. Males may adjust investment in seminal fluid based on competition levels.

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Area of Science:

  • Reproductive biology
  • Behavioral ecology
  • Evolutionary biology

Background:

  • Sperm competition studies traditionally focus on sperm traits, overlooking seminal fluid's role.
  • Seminal fluid influences sperm performance and can affect rivals' success.
  • Males are expected to strategically invest in both sperm and seminal fluid.

Purpose of the Study:

  • To investigate the role of seminal fluid in sperm competition within the grass goby.
  • To determine how seminal fluid from territorial and sneaker males affects sperm performance.
  • To explore potential self/non-self recognition mechanisms in seminal fluid interactions.

Main Methods:

  • Experimental manipulation of grass goby ejaculates, combining sperm and seminal fluid from different male types (territorial and sneaker).
  • Assessing sperm velocity and fertilization rates under varying seminal fluid conditions.
  • Comparing sperm performance with own seminal fluid versus rival seminal fluid.

Main Results:

  • Sneaker males' sperm velocity and fertilization rates increased in the presence of territorial males' seminal fluid.
  • Territorial males' sperm performance was negatively impacted by sneaker males' seminal fluid.
  • Seminal fluid effects were tactic-specific, not based on a simple self/non-self recognition.

Conclusions:

  • Cross-interactions between sperm and seminal fluid are crucial in determining fertilization success during sperm competition.
  • Seminal fluid composition is a key factor in male reproductive strategies and competition outcomes.
  • Males may adjust seminal fluid investment in response to sperm competition intensity.