Animal Science 300

Lecture Exam 1

February 26, 2001

                                                                                    NAME ______________________________ 

            This examination is conducted on the honor system.  The printing or signing of your name above pledges you to neither give nor receive assistance with this exam.  Disregarding this pledge will result in a grade of zero (0) for this examination.

I.                    Provide the most appropriate term or phrase corresponding to the following descriptions. (20)

____________________1.  Ovarian follicles in which follicular fluid has begun to coalesce among the follicle cells forming an antrum.

____________________2. Earliest somatic cells of the gonad to differentiate under the influence of the Sry gene.

____________________3. Ligament primarily responsible for orientation and inguinal passage of the descending testis.

____________________4. Portion of the broad ligament which supports the uterus and cervix.

____________________5. Dorsal compartment of the penis primarily involved in erection.

____________________6. Central, vascular region of the ovary in most species.

____________________7. Smooth muscle which retracts the penis in domestic animals.

____________________8. Muscosa plus submucosa of the uterus.

____________________9. Classification of the female reproductive tract in marsupials.

____________________10. Striated muscle which covers and compresses the crura (root) of the penis.

II. List one male and one female structure with the following histological characteristics. (10)

Histological Feature

Male Structure

Female Structure

Predominantly ciliated columnar epithelium

 

 

Prominent muscularis with little submucosa

 

 

Exocrine glands,simple columnar epithelium

 

 

stratified squamous epithelium

 

 

predominantly dense, fibroelastic tissue

 

 

III. List one species characterized by the following anatomical features. (20

Anatomical Feature

Species

longitudinal cervical folds

 

prominent ovarian bursa

 

filiform appendage

 

inverted oblique testis

 

vascular penis

 

polytocous ovary

 

ovulation fossa

 

forked penis

 

os penis

 

very large Cowper’s gland

IV. Match the number for the embryonic structures listed with the corresponding adult male and female structures.    Numbers may correspond to none, one, or more than one adult structure.  Use only one number for each response. (20)

#

Embryonic structure

Adult Structure

1

paramesonephric duct

Male

#

Female

#

2

urogenital sinus

testis

 

ovary

 

3

mesonephric duct

seminiferous tubule

 

primary oocyte

 

4

mesonephric tubule

spermatogonium

 

infundibulum

 

5

metanephric duct

efferent ducts

 

isthmus of oviduct

 

6

genital tubercle

epididymis

 

uterine horn

 

7

primordial germ cell

vas deferens

 

cervix

 

8

primary sex cord

vesicular gland

 

anterior vagina

 

9

pronephros

prostate gland

 

vestibule

 

10

genital ridge

urethra

 

bladder

 

 

 

penis

 

clitoris

 

V. Provide a brief description or explanation of the following. (10)

1.     Relationship of bound, labeled hormone to the amount of unlabeled hormone (standards or unknowns) in a competitive protein binding assay, i.e. radioimmunoassay. 

2.     Change in the pattern of gonadotropin releasing hormone secretion in the peri-puberal (1) male and (2) female.

 male -

female -

3.     Pampiniform plexus

 4.     Tunica vaginalis

 5. Corpus hemorrhagicum

VI. Using information presented on general endocrinology and the hypothalamic-pituitary-gonadal axis, write a narrative on the regulation of testosterone in the general circulation of the adult bull.   Try to include (not necessarily define)  as many of the following terms in your response as possible but include only those terms which you can use correctly.   Use the back of this page if necessary and please write legibly.  (20)

surge nucleus

tonic nucleus

hypothalamic-hypophyseal portal system

gonadotroph

Leydig cell

gonadotropin releasing hormone (GnRH)

luteinizing hormone (LH)

testosterone

G-protein

phosphoinositide (a phospholipid, PIP2)

inositol triphosphate (IP3)

diacylglycerol (DAG)

plasma membrane receptor

ATP

cAMP

adenylate cyclase

phospholipase C (PLC)

protein kinase

nuclear receptor

smooth endoplasmic reticulum (SER)

decapeptide

glycoprotein

a and b subunits

steroid

negative feedback inhibition