1. Organismal Development Part 3
Male Animals

2. Mitochondrion Intermembrane space Outer membrane Free ribosomes in the.
Mitochondrion
Intermembrane space
Outer
membrane
Free
ribosomes
in the
mitochondrial
matrix
Inner
membrane
Cristae
Matrix
Mitochondrial
DNA
100 nm

3. Phermones

4. Earthworms are hermaphrodites

5. Protogynous (Male is blue)

6. External Fertilization

7. Internal Fertilization required

8. Spermatogenesis Epididymis Seminiferous tubule Testis Cross section
of seminiferous
tubule
Spermatogonium
Mitotic division, producing
large numbers of spermatogonia
Sertoli cell
nucleus
Differentiation and onset of meiosis I
Primary spermatocyte
(in prophase of meiosis I)
Meiosis I completed
Secondary spermatocyte
Meiosis II
Lumen of
Seminiferous tubule
Early
spermatids
Spermatids
(at two stages of
differentiation)
Differentiation
Sperm cells
Neck
Head
Midpiece
Tail
Plasma membrane
Acrosome
Nucleus
Mitochondria

9. Secondary Sexual Characteristics