Lecture 24 3/18/24 Flashcards

1
Q

What is the main function of the testes?

A

spermatogenesis

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2
Q

How do FSH and LH act on the testes?

A

-FSH stimulates Sertoli cells
-LH stimulates testosterone production

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3
Q

What is the tunica vaginalis?

A

layer outside of the tunica albuginea that surrounds the entire testicle

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4
Q

What is the specific site of spermatogenesis?

A

seminiferous tubules

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5
Q

What is the tunica?

A

-dense fibrous connective tissue capsule surrounding each testis
-extends inward to form a central septum

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6
Q

How do the seminiferous tubules appear?

A

-highly coiled within the lobules
-converge into straight tubules leading to the rete testis

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7
Q

What are the characteristics of the tissue layers within the seminiferous tubules?

A

-each tubule is surrounded by 1-4 layers of flattened smooth muscle
-smooth muscle supports the spermatogenic cells and Sertoli cells

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8
Q

In which seminiferous tubule cells does spermatogenesis occur?

A

the most mature cells, closest to the lumen

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9
Q

What are the characteristics of spermatogonia?

A

-most immature spermatogenic cells
-small, round cells with dark, round nuclei
-adjacent to basement membrane
-undergo meiotic division to produce primary spermatocytes

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10
Q

What are the characteristics of spermatocytes?

A

-larger and more luminal than spermatogonia
-divided into primary and secondary spermatocytes

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11
Q

How do primary and secondary spermatocytes differ?

A

-primary are in 1st meiotic division
-secondary are in 2nd meiotic division

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12
Q

What are the characteristics of spermatids?

A

-formed after spermatocytes complete second meiotic division
-initially round with pale nuclei
-eventually become small and oval/elongated with dark heads and long, faint tails

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13
Q

What are the characteristics of spermatozoa?

A

-divided into head, neck, and tail
-actively mobile
-head = nucleus covered by acrosome

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14
Q

What are Sertoli cells?

A

nurse cells that provide mechanical and nutritive support for spermatogenic cells

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15
Q

What are the characteristics of Sertoli cells?

A

-irregularly columnar
-extend from basal lamina to lumen
-indistinct boundaries
-numerous invaginations in cell membranes

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16
Q

What are the characteristics of the interstitium?

A

-between the tubules
-highly vascularized connective tissue
-contains Leydig cells

17
Q

What are the characteristics of Leydig cells?

A

-eosinophilic granular to vacuolated cytoplasm
-large, round, often eccentric nucleus

18
Q

What is the function of Leydig cells?

A

produce testosterone

19
Q

What is the passageway through the ducts?

A

-rete testis
-testicular efferent ducts
-head, body, and tail of epididymis
-vas deferens
-urethra

20
Q

Why are there ciliated cells within the epithelium of the testicular efferent ducts?

A

to help with sperm movement

21
Q

What are the functions of the testicular efferent ducts?

A

-epithelial cells absorb luminal fluid produced during spermatogenesis
-ciliated cells move sperm through duct

22
Q

What are the characteristics of the epididymis?

A

-coiled tube
-contains head, body, and tail
-epithelium contains long apical stereocilia

23
Q

What are the functions of the epididymis?

A

-stereocilia have absorptive and secretory functions
-sperm undergo final maturation in middle segment
-tail is site of storage for mature spermatozoa

24
Q

What are the characteristics of the vas deferens?

A

-very thick muscularis
-highly folded mucosa

25
Q

What are the functions of the urethra?

A

-semen transport
-urine transport

26
Q

What are the three portions of the urethra?

A

-prostatic
-pelvic
-penile

27
Q

Which accessory glands are present in the male?

A

-ampullary glands of vas deferens
-seminal vesicles
-prostate
-bulbourethral glands
-urethral glands

28
Q

What are the characteristics of the accessory glands?

A

-architecture of all is similar
-secrete serous or mucinous fluids

29
Q

What do the ampullary glands empty into?

A

vas deferens

30
Q

Which species lack seminal vesicles?

A

carnivorous species

31
Q

What is contained in the fluid produced by the seminal vesicles?

A

-fructose
-prostaglandins
-coagulating proteins

32
Q

What are the characteristics of the prostate?

A

-encircles urethra as it leaves urinary bladder
-consists of body and disseminated portion
-secretions enhance sperm motility

33
Q

What are the characteristics of the bulbourethral glands?

A

-not found in dogs
-secretes alkaline mucus-like fluid
-fluid neutralizes acidity of residue in urethra and vaginal secretions

34
Q

What are the two parts of the penis?

A

-body
-glans penis

35
Q

What are the two erectile tissues found in the penis?

A

-corpus spongiosum: surrounds urethra
-corpus cavernosum: dorsal to urethra

36
Q

What are the three types of penis, based on connective tissue and smooth muscle?

A

-fibroelastic: connective tissue predominates
-intermediate: smooth muscle and connective tissue in equal amounts
-vascular: smooth muscle predominates

37
Q

What are the characteristics of the glans penis?

A

-expanded distal portion of the penis
-contains erectile tissue continuous with corpus spongiosum
-contains os penis in carnivores

38
Q

How does the prepuce of the glans penis appear in tomcats?

A

small, keratinized epidermal spines

39
Q

How does the prepuce of the glans penis appear in goats?

A

present urethral process