MEDT200 Lecture Notes - Lecture 9: Hypospadias, Xiphoid Process, Semen Analysis
25 Oct 2017
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Introduction: the male sex cell is called the spermatozoon, or sperm cell, the sperm cell carried its nuclear hereditary material, or chromosomes, in its head region, the tail consists of flagellum, which makes the sperm cell mobile. Twins: fraternal twins- rare instance of two eggs (released) becoming fertilized, identical twins start as a single egg, single sperm, single zygote. 2: spermatogonia- stem cells for sperm, primary spermatocyte- just created sperm cell, spermatids- pretty mature, do not have flagella yet. Single sperm: nucleus makes up most of the space, at the head of the sperm- called acrosome (meaning body that is at the extremity), point of contact with an ovum. Testicular parenchymal cells: produce and release billions of sperm cells throughout the (cid:373)a(cid:374)"s lifeti(cid:373)e. Testosterone (testicular interstitial [leydig] cells) (franz leydig, 1850: secondary sex characteristics of the male, beard, pubic hair, deeper voice. Cholesterol is the common precursor for male/female hormones.
