Anterior Pituitary Gland

Diagram of posterior and anterior pituitary hormones, showing hypothalamic releasing hormones, pituitary hormones, target organs, and physiological effects.

Anterior Pituitary Endocrine Function

Diagram of the HPA axis showing stress and diurnal regulation influencing the hypothalamus, which releases CRH to stimulate the anterior pituitary to release ACTH. ACTH stimulates the adrenal cortex to produce cortisol, which affects multiple target organs and provides feedback inhibition.

Cortisol and the HPA Axis

Diagram of the hypothalamic–pituitary–growth hormone axis showing hypothalamic GHRH stimulation and somatostatin suppression of the anterior pituitary, growth hormone effects on the liver and metabolism, IGF-1 production, and stimulation of bone and muscle growth with negative feedback.

Growth Hormone

Hypothalamic-Pituitary-Thyroid Axis

Diagram of prolactin regulation showing hypothalamic TRH stimulation and dopamine inhibition of prolactin release from the anterior pituitary, with effects on breast tissue and suckling-related feedback.

Prolactin

Diagram of the hypothalamic–pituitary–gonadal axis showing hypothalamus, GnRH, anterior pituitary, LH and FSH, gonads, sex hormones, and negative feedback loops.

Gonadotropins and the Hypothalamic Pituitary Axis

Popular

Diagram showing parasympathetic pathways from the superior and inferior salivatory nuclei to the parotid, submandibular, and sublingual glands.
The Mouth

Regulation of Saliva

by Jess Speller

Tissue Structure

Blood Vessels

by Sam Barnes

Diagram showing protein breakdown by the proteasome into peptides, their transport by TAP into the endoplasmic reticulum, loading onto MHC class I, and movement through the Golgi and secretory vesicles to the cell surface.
Adaptive Immune System

Antigen Processing and Presentation

by Antonia Round