2 1

Colloid containing thyroglobulin / Stored thyroid hormone Follicular cells (nuclei of)

2 (cells) 1 3

Area of parafollicular or C cells Thyroid follicles Colloid containing thyroglobulin

1 2

Acinar tissue Pancreatic Islet

2 1

Islets of Langerhans Acinar Tissue

1 Acinar tissue

Enlargement of an Islet of Langerhans Acinar tissue

1 2

Medulla 3 regions of the cortex

Cortex Adrenal medulla sinus

3 (cells)2 (whole thing) Endocrine cell inside the seminiferous tubule = 1

Interstitial cellsSeminiferous tubules of testis Endocrine cell in the seminiferous tubule = sustentacular /Sertoli

Seminiferous Tubules of the Testes 1 2 3

Interstitial cells Area of sperm developing Cells with some sustentacular cells lumen

1 2

Sustentacular cells among Sperm developing cells Interstitial cells (of Leydig)

1 2

Blood vessel surrounded by interstitial cells

= whole structure

antrum Corpus luteum Granulosa / Follicular cells Grafian / tertiary follicle

1 2

Fluid filled antrum Granulosa / follicular cells

1 2 3 = Whole structure shown above

Fluid filled antrum Granulosa / follicular cells 3 = Grafian / tertiary follicle

Large circular structure?

Corpus Luteum

1 2 3

Pars distalis of anterior pituitary (red, blue and gray) Pars nervosa / Posterior pituitary / Neurohypophysis Infundibulum / Pituitary stalk