Poor sperm morphology refers to abnormalities or irregularities in the shape and structure of sperm cells. These abnormalities can include misshapen heads, bent tails, or other irregularities.

The reduced chances of poor sperm morphology in reaching the egg can be attributed to several factors:

1. Reduced motility: Abnormalities in sperm shape can impair their ability to swim effectively. Sperm with poor morphology may have reduced motility, making it difficult for them to navigate through the female reproductive tract and reach the egg.

2. Impaired penetration: Sperm with abnormal morphology may face challenges in penetrating the protective layers surrounding the egg. The shape irregularities can hinder their ability to break through these barriers and reach the egg for fertilization.

3. Decreased viability: Poorly shaped sperm cells may have lower viability and reduced ability to survive the journey to the egg. They may be more susceptible to damage and less likely to maintain their structural integrity during the travel through the female reproductive system.

4. Altered DNA packaging: Sperm abnormalities can affect the DNA packaging within the sperm head. Distorted or incomplete DNA packaging may compromise the genetic material, reducing the sperm’s ability to successfully fertilize the egg.

5. Hindered binding: The surface irregularities on sperm with poor morphology can impact their ability to bind to the receptors present on the egg’s surface. Proper binding is essential for successful fertilization, and abnormalities in sperm morphology can hinder this crucial interaction.

It is important to note that while poor sperm morphology can decrease the chances of successful fertilization, it does not necessarily imply complete infertility. 

Some sperm with abnormal morphology can still be capable of fertilizing an egg, albeit at a lower rate compared to healthy, normally shaped sperm.