week 10 - LAB Flashcards
function of seminiferous tubules
Seminiferous tubules are located within the testes, and are the specific location of meiosis, and the subsequent creation of male gametes, namely spermatozoa
function of intersitital cells (leydig cells)
to produce the androgen, testosterone, under the pulsatile control of pituitary luteinizing hormone (LH)
descent into the scrotum during development
Around 2 months before birth, testosterone will stimulate the migration of testes towards the scrotum, which will make them descend. It is guided by a fibrous cord called gubernaculum
effect of FSH on the testes
increased the total germ cell number and spermatogonial and spermatocyte numbers
effect of LH on testes
stimulates testosterone release by the Leydig cells of the testes
roles of mitosis and meiosos in spermatogeneis
Mitotic divisions, which maintain a stem cell population of spermatogonia and provide the cells destined to become mature sperm it is a continuous process that produces four gametes per spermatocyte
Meiosis processes is what matures the sperm
function of sertoli cells
facilitate the progression of germ cells to spermatozoa via direct contact and by controlling the environment milieu within the seminiferous tubules.
gamaetess produced by each germ cell
4
chromosomes number in each sperm
23
tissues/function of testes
epididymis:
a long, coiled tube that produces sperm. Made up from the head, body and tail
seminiferous tubules
testes:
Tunics albuginea - ehite fibrous capsule consisting of dense ct
Tunica vaginalis - outer later derived from peritoneum
strotum:
Cremaster muscles - bands of skeletal muscle that elevates testes
Darits muscle - layer of smooth muscle that wrinkles skin
store, mature and devleop sperm and trasnport to the tests
tissue/function of vas deferns
b) tissues (and their functions) making up the wall of these structures
pseudostratified columnar epithelium
Lamina propria - loose connective tissue
3 Muscle layers smooth muscle (inner/out long, mid cir) - propels sperm
adventitia- connective tissue
c) functions in relation to maturation, storage and/or distribution of sperm
transports mature sperm to the urethra in preparation for ejaculation
ejaculatory duct function/tissues
a) location
In prostate gland, inferior to bladder
b) tissues (and their functions) making up the wall of these structures
pseudostratified columnar epithelium
middle layer made up of a collagenous material
Muscle layer - smooth muscle
c) functions in relation to maturation, storage and/or distribution of sperm
delivers sperm into the urethra, adding secretions and additives from the prostate necessary for sperm function
uretha function/strutcure
b) tissues (and their functions) making up the wall of these structures
Prostatic - transitional epi
Intermediate - pseudostratified columnar epithelium
Spongy - stratified coloumar epithelium
Corpus spongiosum - surrounds urethra adn expands to form bulb of penis
Corpora cavernosa - erection, what fills with blood
Tunica of albuginea of erectile bodies
Skin
c) functions in relation to maturation, storage and/or distribution of sperm
Will be the way that sperm is ejactulated
order in which male sex cells pass from formation to exit
Testes - contained in scrotum
Epididymis - sperm maturation in the seminiferous tubules
Vas deferens - ascends through spermatic cord
Seminal vesicles - glands producing seminal fluids
Ejaculatory ducts - conduct seminal vesicle fluids to urethra
Prostate gland - gland contributing to semen
Bulbourethral gland - gland contributing to semen
Urethra - transport for semen
seminal vesicle
a) location
Inferior to bladder, by the vas deferns
b) numbers
2
c) components of the secretion and their function(s)
The secretion of the seminal vesicles constitutes the bulk of the seminal fluid (semen). It is a thick fluid that contains the sugar fructose, proteins, citric acid, inorganic phosphorus, potassium, and prostaglandins
d) point of entry of secretion into the reproductive pathway
Duct of seminal gland joins ductus deferens to form ejactory duct
e) contribution of secretion to male fertility
important for semen coagulation and may promote sperm motility, increase stability of sperm chromatin, and suppress the immune activity in the female reproductive tract.
