Posterior Pituitary Gland

Structural diagram of oxytocin, showing its cyclic peptide backbone, disulfide bond, and labeled residues.

Oxytocin

Diagram of the pituitary gland showing the anterior and posterior pituitary, pituitary stalk, sella turcica, and basilar artery.

Posterior Pituitary Endocrine Function

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Special Circulations

Skeletal Muscle Circulation

by Arjun Nehra

Diagram showing upper motor neuron pathways from the precentral gyrus through the midbrain and medulla, crossing at the pyramidal decussation and continuing in the spinal cord to a lower motor neuron and skeletal muscle.
Motor System

Upper Motor Neurones

by Peter Dudley

Graph comparing immune responses: a large, slower initial response, a smaller faster response after inapparent reinfection, and a sharp rapid response after mild or inapparent reinfection, with memory persisting over years.
Adaptive Immune System

T Cell Memory

by Emily Crawley