Embryology - 26 Jun 2024 Expand to Translate
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Nelsen OE. Comparative embryology of the vertebrates (1953) Mcgraw-Hill Book Company, New York.

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Part I The Period of Preparation

Part I - The Period of Preparation: 1. The Testis and Its Relation to Reproduction | 2. The Vertebrate Ovary and Its Relation to Reproduction | 3. The Development of the Gametes or Sex Cells

The events which precede the initiation of the new individual's development are:

The preparation of the male and female parents and their reproductive structures for the act of reprcxluction (Chaps. 1 and 2).
The preparation of the gametes (Chap. 3).

The anterior lobe of the pituitary gland, because of its secretion of the gonadotrophic (gonad-stimulating) hormones, is the pivotal structure in the reproductive mechanism.

The gonadotrophic hormones are:

Follicle-stimulating hormone, FSH;
Luteinizing hormone, LH (ICSH), and
Luteotrophin, LTH.

The Testis and Its Relation to Reproduction

A. Introduction

1. General description of the male reproductive system

2. Importance of the testis

B. Anatomical features of the male reproductive system

1. Anatomical location of the testis

2. Possible factors involved in testis descent

3. General structure of the scrotum and the testis in mammals

a. Structure of the scrotum

b. General structure of the testis

4. Specific structures of the mammalian testis which produce the reproductive cells and the male sex hormone

a. Seminiferous tubules

b. Interstitial tissue

5. The testis of vertebrates in general

6. Accessory reproductive structures of the male

a. The reproductive duct in forms utilizing external fertilization

b. The reproductive duct in species practicing internal fertilization

C. Specific activities of the various parts of the male reproductive system

1. Introduction

a. Three general functions of the male reproductive system

b. Some definitions

2. Activities of the testis

a. Seasonal and non-seasonal types of testicular activity

b. Testicular tissue concerned with male sex-hormone production

c. Testicular control of body structure and function by the male sex hormone

1) Sources of the male sex hormone

2) Biological effects of the male sex hormone

a) Effects upon the accessory reproductive structures

b) Effects upon secondary sex characteristics and behavior of the individual

c) Effects upon the seminiferous tubules

d. Seminiferous-tubule activity and formation of sperm

e. The seminiferous tubule as a sperm-storing structure

3. Role of the reproductive duct in sperm formation

a. Vertebrates without a highly tortuous epididymal portion of the reproductive duct

b. The epididymis as a sperm-ripening structure

c. The epididymis and vas deferens as sperm-storage organs

d. Two types of vertebrate testes relative to sperm formation

4. Function of the seminal vesicles (vesicular glands)

5. Function of the prostate gland

6. Bulbourethral (Cowperâ€™s) glands

7. Functions of seminal fluid

a. Amount of seminal fluid discharged and its general functions

b. Coagulation of the semen

c. Hyaluronidasc

d. Accessory sperm

e. Fructose

f. Enzyme-protecting substances

D. Internal and external factors influencing activities of the testis

1. Internal factors

a. Temperature and anatomical position of the testis

b. Body nourishment in relation to testicular function

c. The hypophysis and its relation to testicular function

2. External environmental factors and testis function

a. Light as a factor

b. Temperature influences

E. Internal factors which may control seasonal and continuous types of testicular function

F. Characteristics of the male reproductive cycle and its relation to reproductive conditions in the female

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Cite this page: Hill, M.A. (2024, June 26) Embryology Book - Comparative Embryology of the Vertebrates 1. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Book_-_Comparative_Embryology_of_the_Vertebrates_1

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