Tissue Structure

Microscopic image showing pink-stained simple cuboidal epithelial cells lining irregular tubular spaces.

Epithelial cells

Diagram classifying exocrine glands by duct structure and secretory unit, showing simple and compound tubular, alveolar (acinar), and tubuloalveolar forms with examples.

Structure of Glands

Diagram and micrograph of hyaline cartilage showing chondrocytes in lacunae within a surrounding matrix.

Cartilage

Skin

Diagram of non-neoplastic cell changes showing a normal cell group branching to atrophy, hyperplasia, hypertrophy, metaplasia, and dysplasia.

Cellular Adaptations

Blood Vessels

Muscle Histology

  • Smooth Muscle
  • Skeletal Muscle
  • +1 more

Bones

  • Bone Ossification

Nerves

Popular

Illustration of the retina’s layered structure, labeling the optic nerve, retinal cell types, retinal pigment epithelium, choroid, and sclera.
Ocular Physiology

The Retina

by Teerajet Taechameekietichai, Rose-Anne Nunoo and Darshigaa Gurumoorthy

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.
Anterior Pituitary Gland

Cortisol and the HPA Axis

by Kishan Pankhania and Elly Voogt

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