MALE GENITAL SYSTEM

Question 1

define testes compared to ovaries

Answer 1

smoother and more compact

usually paired

Question 2

what animals dont have a paired testes

Answer 2

some teleosts and cyclostomes

Question 3

how are testes attached to body wall

Answer 3

using mesentary called mesorchium

cf mesovarium

Question 4

what does scrotal sac do

Answer 4

the testes descend into this sac and it remains connectd to the coelom via the inguinal camal

keeps balls cool

Question 5

what are the main genital ducts

Answer 5

the vas deferens which comes from the archinephric duct if it no longer produces urine

Question 6

what happ to the anterior part of the vas deferens

Answer 6

it becomes the epidymus which is specialized for sperm storage

Question 7

what does the male genital system look like for cyclostomes

Answer 7

single median testes

have no genital ducts and sperm is released directly into the coelom, exits from the cloaca or the papilla protruding from the cloaca

archinephric duct drains urine from the mesonephric or opisthonephric

Question 8

what does male genital system look like for chondricthyans

Answer 8

have rudimentary mullerian ducts (oviducts)

short uriniferous tubules of pronephros combne with the epididymus and they join the testes to the archinephric duct

acessory urinary duct form for the opisthoneohric kidney

Question 9

what does male genital system for bony fishes look like

Answer 9

the archinephric duct drains urine from the kidneys and may receive sperm from the testes

Question 10

teleosts male genital system (bony fish)

Answer 10

have a seperate sperm duct - testiculuar duct and may exit body indpendantly from the archinephric

some teleosts release sperm directly into the coelom —> sperm exits through the genital pores

Question 11

how does male genital work in lissamphibians

Answer 11

archinephric duct usually transports sperm but may still continue to do urine

testis may transfer sperm through archinephric ducts\ or through coopted pronephric tubules – or may form secondary ducts that pass around the pronephros

Question 12

how does male genital system work for amniotes

Answer 12

archinephric duct is a vas def and does sperm only

mesonephric urinif tubule may contribute to epididymus

metephrenic kidney drained by ureter

Question 13

amniote male acessory gland

Answer 13

glandular secretions are added t the sperm to make seminal fluid (semen)

in most amniotes, seminal vessicles are an expansion of posterior part of the vas def for semen storage

prostate and bulbourethral provide other secretions

Question 14

external fertilization

Answer 14

aquatic only

male sheds sperm on the eggs on the outside of the body

can allow for mass fert

Question 15

internal fertilization

Answer 15

male inserts append into female and allows formation of eggs or could be live births

Question 16

sperm transfer

Answer 16

sperm enters female body w/o insertion of append

may be passed from male clocaca to female

Question 17

how do male salamanders do sperm transfer

Answer 17

lay down a sperm packet (spermataphore) for a female to collect w her cloaca

Question 18

male intromittent organ chondrichthyans

Answer 18

modified pelvic fins (claspers) - bear groove for semen

Question 19

male intromittent organ in some teleosts

Answer 19

modified anal - gonopodium

Question 20

amnioite intromittent

Answer 20

squamates: paired grooved hemipens - one insert at a time

priminituve birds, turtules, crocs, mmmals : one median penis

most mammals: bacculum (os penis)