13 Testis

Endoplasmic reticulum Primary spermatocyte

Nucleus of Cytoplasm of Sertoli cell Lipid vacuole

Primary spermatocyte

Testis, Sertoli cell, ox; x4000.

Endoplasmic reticulum Acrosomal process Perforatorium

Head of , nucleus

Outer acrosomal membrane

Subacrosomal space

Testis, late maturation phase, ox; x5000.

Head of spermatozoon Fragments of cells of corona radiata

Zona pellucida

Head of spermatozoon

Fragments of cells of corona radiata

Spermatozoa in zona pellucida, ox; x8500. 13 Male reproductive system Testis

Spermatids (acrosomal phase) Sertoli cell

Spermatogonia

Interstitial connective tissue with vessels

Leydig cells

Primary spermatocytes

Testis, seminiferous tubules, cat. Azan stain; x400.

Spermatids (acrosomal phase) Spermatogonia

Sertoli cell

Interstitial connective tissue with vessels

Leydig cells

Primary spermatocyte

Testis, seminiferous tubules, cat. Azan stain; x400.

Spermatogonia

Leydig cells

Sertoli cell

Spermatids (established acrosomal phase)

Primary spermatocytes

Spermatogonia

Sertoli cell

Leydig cells Testis, seminiferous tubules, pig. Goldner's Masson trichrome stain; x400. 13 Male reproductive system Testis

Spermatids (Golgi phase)

Primary spermatocyte

Sertoli cell

Leydig cells Primary spermatocyte

Spermatogonia

Spermatids (acrosomal phase)

Testis, seminiferous tubules, pig. Goldner's

Masson trichrome stain; x400.

Spermatids (Golgi phase)

Lamina propria Primary spermatocyte

Sertoli cell

Primary spermatocytes

Spermatogonia

Spermatids (cap phase)

Spermatogonia Testis, seminiferous tubules, ox. H.E. stain; x 4 0 0.

Spermatids in late maturation phase Primary spermatocytes

Sertoli cell

Primary spermatocyte

Spermatogonia Sertoli cell Lamina propria with stratum myoideum, stratum fibrosum and basal lamina

Testis, seminiferous tubules, ox. H.E. stain; x400. 13 Male reproductive system Testis

Convoluted seminiferous tubules

Rete testis (often filled with spermatozoa)

Mediastinum testis (connective tissue and )

Convoluted seminiferous tubules

Testis, rete and , goat. H.E. stain; x40.

Transition from straight testicular tubule to

Convoluted seminiferous tubules

Rete testis with squamous to columnar epithelium

Mediastinum testis (connective tissue with myofibroblasts and vessels)

Testis, rete and mediastinum testis, ox. H.E. stain; x40.

Cuboidal to columnar epithelium Rete testis

Cuboidal to columnar epithelium

Mediastinum testis (connective tissue with vessels and myofibroblasts)

Testis, rete and mediastinum testis, ox. H.E. stain; x200. 13 Male reproductive system Testis

Convoluted (Golgi-Phase)

Interstitium with Leydig cells and capillaries

Convoluted seminiferous tubule (late maturation phase and delivery of spermatozoa into lumen, spermiation)

Convoluted seminiferous tubule (acrosomal phase) Testis, seminiferous tubules, horse. Goldner's Masson trichrome stain; x100.

Lamina propria with stratum myoideum, stratum fibrosum and basal lamina

Spermatogonia

Sertoli cell

Spermatids (established acrosomal phase)

Primary spermatocyte

Testis, convoluted seminiferous tubule, horse. H.E. stain; x400.

Interstitium with Leydig cells and capillaries

Lamina propria

Spermatogonia Sertoli cells Primary spermatocyte

Spermatids (late Golgi phase)

Spermatids (early Golgi phase )

Testis, convoluted seminiferous tubule, horse. Goldner's Masson trichrome stain; x400. 13 Male reproductive system Testis

Testicular veins

Testicular artery

Autonomic nerve fibre

Pampiniform plexus, ox. H.E. stain; x100.

Epidermis, weakly keratinised, few hairs Sebaceous glands with secretory duct

Subcutis (tunica ) with smooth muscle cells

Smooth muscle cells

Sweat glands

Scrotum, horse. H.E. stain; x100.

Tubular sweat glands (apocrine secretion)

Hair (partial section)

Scrotum, pig. H.E. stain; x120.