he sinh san nam
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H SINH S N NAMỆ Ả
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1. Mô tả cấu tạo của tinh hoàn, đường dẫn tinh và dương vật
2. Hiểu được cơ chế phát sinh giao tử nam.
3. Hiểu được một số cơ chế sinh lý sinh dục nam.
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Tinh hoàn Mào tinh, ng d n tinhố ẫ Túi tinh, ti n li t tuy n, ng phóng tinhề ệ ế ố D ng v tươ ậ
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Là thành d i b ngướ ổ ụ Gi i h n:ớ ạ
Tr c: b d i x ng v (x ng mu)ướ ờ ướ ươ ệ ươ Hai bên: 2 ng iụ ồ Phía sau: đ nh x ng c tỉ ươ ụ
B t l d i khung ch u: ph n m m(c , ị ỗ ướ ậ ầ ề ơphúc m c)ạ
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Hình oval KT~4cm x2.5cmx3cm Tinh hoàn n m trong bìu, đ c bao b i ằ ượ ở
phúc tinh m c ạ màng tr ng (s i x )ắ ợ ơ Chia thành nhi u ti u thùy ch a ng sinh ề ể ứ ố
tinh ng sinh tinh: ng l n/ngo n ngoèoỐ ố ượ ằ Thai nhi: tinh hoàn n m trong b ngằ ổ ụ
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Tinh nguyên bào A
Tinh nguyên bào B (tinh bào I)
Tinh bào II
Tiền tinh trùng (tinh tử)
Tinh trùng(1n)
Tinh nguyên bào A
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• Cấu tạo: đầu – cổ - phần giữa - đuôi
• Vận tốc ~3mm/phút trong đường sinh dục nữ
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Tinh trùng đi t ng sinh tinh ừ ố ng th ng ố ẳ l i tinh hoàn ướ ng ra ố ng mào tinh ốhoàn ng d n tinh.ố ẫ
ng d n tinh n i ti p mào tinh hoàn Ố ẫ ố ế ng ốb n ẹ sau bàng quang ni u đ o.ệ ạ
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Thân: da bao ngoài Qui đ u: t n cùng c a v t x pầ ậ ủ ậ ố 2 v t hangậ V t x p: bao quanh ni u đ oậ ố ệ ạ
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S n xu t tinh trùng: t lúc d y thì ả ấ ừ ậ su t đ i.ố ờ M i ngày có ~100-300 tri u tinh trùng đ c s n ỗ ệ ượ ả
xu tấ Tinh d ch: tinh trùng + ch t ti t c a túi tinh, tuy n ị ấ ế ủ ế
ti n li t, tuy n Cowper và tuy n ni u đ o.ề ệ ế ế ệ ạ M i l n phóng tinh ~2,5-3,5ml tinh d chỗ ầ ị Tinh d ch bình th ng ch a 100 tri u tinh ị ườ ứ ệ
trùng/ml. Tinh d ch ch a < 20 tri u tinh trùng/ml ị ứ ệ vô sinh
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Hi n t ng c ng: KT ệ ượ ươ dãn ti u đ ng m ch ể ộ ạ máu đ đ y mô x p ổ ầ ố chèn ép các TM máu ứ DV c ng c ng. Trung khu ph i h p n m ươ ứ ố ợ ằ ởđo n t y l ng nh n xung đ ng t TKTW và CQSDạ ủ ư ậ ộ ừ
Hi n t ng phóng tinh: ệ ượ Là 1 ph n x t y có 2 giai đo nả ạ ủ ạ
Ti t tinh d ch và di chuy n vào ni u đ oế ị ể ệ ạ C b u hang co th t ơ ầ ắ phóng ra kh i ni u ỏ ệ
đ o/c c khoái.ạ ự
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Testosteron: t bào Leydig – tuy n kẽ tinh ế ế ởhoàn (ch y u) và v tuy n th ng th n ủ ế ỏ ế ượ ậti t ra (1 l ng ít)ế ượ
M t s androgen khác: androstenedion, ộ ốdihydrotestosteron
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Tinh hoàn trong b ngổ ụ Vô sinh nam R i lo n c ng d ngố ạ ươ ươ U x ti n li t tuy nơ ề ệ ế Ung thư
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