By the end of this session, the learner will be able to describe organs using a six-part framework covering site, shape, size/weight, relations, nerve supply, and blood supply.
A 6-Part Framework for Learning the Anatomy of Organs
The study of visceral anatomy is essential for understanding organ structure, function, and the spatial relationships that define internal body systems. Because of the complexity and diversity of visceral organs, applying a consistent method enhances clarity and long-term retention.
This six-part framework can be applied to any organ in the body.
Activity
1. Site
The site identifies the anatomical region in which the organ is located. This foundational information provides context for function and neighbouring structures.
Examples:
- The liver is an organ of the abdomen.
- The eye is an organ of the head.
- The bladder is an organ of the pelvis.
2. Shape
The shape describes the external form of the organ, which often reflects its function, embryological origin, and anatomical relationships.
Examples:
- The eye is a spherical organ.
- The kidney is a bean-shaped organ.
- The pancreas is a flat, pear-shaped organ.
3. Size / Weight
The size or weight of an organ reflects its physical dimensions. This may vary with age, sex, or pathology and is relevant in clinical examination and imaging.
Examples:
- The liver is a large organ.
- The gallbladder is a small organ.
- The thyroid gland is a small, butterfly-shaped organ.
4. Relations
Relations describe the organ’s position relative to nearby structures. This includes neighbouring organs, spaces, membranes, and whether the organ is intraperitoneal or retroperitoneal.
Examples:
- The stomach lies anterior to the pancreas.
- The kidney is a retroperitoneal organ.
- The bladder lies posterior to the pubic symphysis.
5. Nerve Supply
The nerve supply identifies the somatic and/or autonomic innervation that regulates an organ’s physiological function.
Examples:
- The liver is innervated by the hepatic plexus.
- The bladder receives parasympathetic fibres from the pelvic splanchnic nerves and sympathetic fibres from the hypogastric plexus.
- The heart is innervated by the cardiac plexus, containing both sympathetic and parasympathetic fibres.
6. Blood Supply
This section describes the arterial supply and venous drainage of the organ, critical for understanding perfusion, metabolic function, and diseases involving ischaemia.
Examples:
- The liver is supplied by the hepatic artery and portal vein.
- The kidney is supplied by the renal artery.
- The bladder is supplied by the superior and inferior vesical arteries.
