الخصائص والوظائف الجنسية

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Questions and Answers

ما هو قطر كل خصية من الخصيتين؟

2-3 سم

4-3 سم (correct)

4-5 سم

3-4 سم

الخصيتان عضو فردي يتواجد في الصفن.

False

ما هو طول الخصية تقريباً؟

حوالي 4.5 سم

الخصيتان تتواجدان داخل كيس جلدي خارجي يسمى __________.

الصفن Signup and view all the answers

مطابقة الأجزاء مع وظائفها:

الخصيتان = إنتاج الحيوانات المنوية الصفن = الحماية وتنظيم درجة الحرارة الأنابيب المحرية = نقل الحيوانات المنوية البروستاتا = إنتاج السائل المنوي Signup and view all the answers

ما هو طول خلية النطفة؟

60 ميكرومتر Signup and view all the answers

تستمر حياة خلية النطفة لمدة تتراوح من 24 إلى 48 ساعة.

False Signup and view all the answers

ما هي الأجزاء الثلاثة الرئيسية لخلية النطفة؟

الرأس، العنق، السوط Signup and view all the answers

يكون رأس خلية النطفة على شكل ______ وماتس.

بيضى Signup and view all the answers

قم بمطابقة الأجزاء المختلفة لخلية النطفة مع وصفها:

الرأس = يحتوي على المادة الوراثية العنق = يصل بين الرأس والسوط السوط = يساعد في الحركة Signup and view all the answers

متى تخرج الخصيتان من البطن بشكل كامل أثناء نمو الجنين؟

في الشهر الثامن Signup and view all the answers

تضيق القناة الإربية بعد تجاوز الشهر الثامن من الحمل.

True Signup and view all the answers

ما هو الحبل المنوي؟

هو التركيب الذي يحتوي على الأوعية الدموية ويحيط بالخصيتين. Signup and view all the answers

تنزل الخصيتان عبر القناة __________.

الإربية Signup and view all the answers

طابق بين المكونات التالية ووظائفها:

الأوعية الدموية = تزويد الخصيتين بالدم الحبل المنوي = حماية وتغليف الخصيتين القناة الإربية = المسار الذي تنزل منه الخصيتان الخصيتان = إنتاج الخلايا التناسلية الذكرية Signup and view all the answers

Study Notes

Male Reproductive System

The male reproductive system produces, transports, nourishes, and stores sperm, and deposits them in the female reproductive tract during copulation.
It comprises the testes, the tubule system, accessory glands, and the penis.

Testes

Pair of organs located in the scrotum.
Each testis measures approximately 3-4 cm in diameter, 4.5 cm in length, and 4.5 cm in width.
Covered by a dense fibrous connective tissue called the tunica albuginea.
The tunica albuginea extends inward, dividing the testis into 200-300 lobules.
Each lobule contains 2-4 seminiferous tubules.
Leydig cells are located within the tubules and secrete testosterone.
Seminiferous tubules produce and release sperm.

Tubule System

This system is responsible for the production and release of sperm and seminal fluid.
The system begins with the seminiferous tubules within the testes and ends at the opening of the penis.

Internal Spermatic Pathways

Seminiferous Tubules: Tubules with one closed end and one open end which connects to the straight tubules within the testis. These tubules are 30-70 cm long and 150-250 micrometers in diameter. They contain seminiferous epithelium where spermatogenesis (sperm formation) occurs alongside Sertoli cells that provides support to the germ cells.
Straight Tubules: Small tubules connecting seminiferous tubules to the rete testis.
Rete Testis: A network of tubules formed from the union of straight tubules at the mediastinum testis.

External Spermatic Pathways

Efferent Ductules: A series of small tubes that move sperm from the testes to the epididymis.
Epididymal Canal: A single, highly convoluted tube that stores and matures sperm. The epididymis, a structure overlaying the testis, stores sperm and seminal fluid.
Vas Deferens (Ductus Deferens): A tube conveying sperm from the epididymis to the ejaculatory duct. Each vas deferens is about 45 cm in length and 2 mm in diameter.
Ejaculatory Duct: Connects the vas deferens to the prostatic urethra and expels semen into the urethra. This duct is 2 cm long.

Accessory Glands

These glands secrete fluids that nourish and transport sperm, forming part of semen.
Seminal Vesicles: Secrete a portion of the semen, rich in fructose, prostaglandins, and peptide hormones. These vesicles lie at the base of the bladder.
Prostate Gland: A compound gland situated at the base of the bladder. It produces a portion of the seminal fluid containing high amounts of zinc, calcium, magnesium, potassium, and spermine to protect sperm and give the fluid its characteristic odor.
Bulbourethral Glands (Cowper's Glands): Pair of small glands located on either side of the urethra, releasing lubricating secretions into the urethra.

Penis

The penis is the copulatory organ.
Contains erectile tissues (corpus spongiosum and corpora cavernosa) for erection.

Sperm

A motile cell approximately 60 µm long, with a lifespan of 48-72 hrs.
Composed of head, midpiece, and tail.
The head contains the nucleus and acrosome (a cap-like structure).
The midpiece contains mitochondria for energy.
The tail propels the sperm forward.

Semen

The ejaculate, a mixture of sperm and seminal fluid.
Typically 2-6 ml volume, with ~90% fluid and ~10% sperm.

Spermatogenesis

The process of sperm formation.
Occurs continuously and involves spermatogonia (primordial germ cells) transforming into mature sperm.
Involves stages: multiplication, growth, maturation, and differentiation.
The process is not 100% efficient: ~25% of spermatocytes are lost between spermatocyte I and spermatid stages.

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استكشف في هذا الاختبار المعلومات الأساسية حول الخصيتين وخلية النطفة. يتضمن أسئلة حول الأبعاد والوظائف والأجزاء المختلفة لهذه الأعضاء الحيوية. اختبر معرفتك بالتفاصيل المتعلقة بالنمو والتطور الجنسي.