3D illustration of a kidney nephron, with the collecting tubule alongside it, forming the basic structural and functional unit of the kidney. The nephron includes the spherical renal corpuscle containing the glomerular (Bowman's) capsule, proximal and distal convoluted tubules, and the hairpin loop of Henle. It drains urine into the collecting tubule.

3D illustration of a kidney nephron, with the collecting tubule alongside it, forming the basic structural and functional unit of the kidney. The nephron includes the spherical renal corpuscle containing the glomerular (Bowman's) capsule, proximal and distal convoluted tubules, and the hairpin loop of Henle. It drains urine into the collecting tubule.

Illustration of the digestive system, including the mouth, esophagus, stomach, liver, gallbladder, small intestine, large intestine, and rectum.

Illustration of the liver, posterior view, depicting the visceral surface of the liver.

Illustration of the anatomy of the liver, gallbladder, and stomach, showing the relationship between these organs and celiac trunk, also known as the celiac artery. The blood supply to the stomach is included. Portions of the stomach and duodenum are cut away to reveal the interior.

Illustration of the anatomy of the organs of the abdominal region, including the liver, gallbladder, and stomach. The blood supply to the stomach is also shown.

Illustration of the normal brain and meninges (left to right): the forebrain and layers of dura and arachnoid mater; inset of the skull, dura, arachnoid, and pia mater, as well as the subarachnoid and subdural spaces; sagittal section of the skull, dura mater, arachnoid mater, cerebrum, cerebellum, brainstem, foramen magnum, and spinal cord.

Medical illustration of the skull and facial bones, frontal view. Labels include: frontal bone, nose bone, cheek bone (zygomatic arch), upper jaw bone (maxilla) and chin (lower mandible).

Illustration showing organs of the thoracic and abdominal cavities, frontal cutaway view.

Illustration of the large and small intestines with blood vessels, showing the blood supply to the abdomen, including the jejunum, ileum, ascending colon, transverse colon, descending colon, the appendix, and the greater omentum, which covers the abdominal contents. The arterial supply to the abdomen originates from the superior mesenteric artery.

Illustration of a female abdomen, frontal cutaway view, showing the organs and blood vessels: kidneys, ureters, bladder, uterus, ovaries, fallopian tubes, abdominal wall, inferior vena cava, abdominal aorta, and renal arteries and veins.

Illustration of the kidney and renal blood vessels, anterior cutaway view. Shown here is the normal anatomy of the renal artery and vein entering the hilum of the kidney with a cutaway section showing intrarenal circulation.

Illustration of the normal liver, shown with the gallbladder removed.

Illustration of lymph vessels and nodes of the posterior abdominal wall and the penis, cutaway view of the back wall of the peritoneal (abdominal) cavity of a male figure. The internal anatomy of the sexual organs and the lymph system that communicates between them and the other organs are also shown.

Illustration of the posterior abdominal wall, cutaway view of the back wall of the peritoneal (abdominal) cavity of a female figure.

Illustration of a cervical vertebra with the spinal cord, superior view. Shown are the spinal cord in section with nerve roots, a normal cervical (neck) vertebra, and an intervertebral disc (consisting of the annulus fibrosus surrounding the nucleus pulposus). The spinal nerves are shown exiting the intervertebral foramina.

Illustration of the spinal cord and cervical spine, cutaway view.

Illustration of the cervical spine with a cutaway view of the skull, anterior view. C1, the atlas, supports the skull; its superior facets articulate with the occipital condyles of the skull. The inferior facets of C1 articulate with C2, the axis. There is no intervertebral disc between them. The carotid canals and internal carotid arteries are also shown.

Illustration showing the normal anatomy of a cervical (neck) intervertebral disc. Labeled structures in the detail include the vertebral body, vertebral endplate, nucleus pulposus, annulus fibrosus, dura, spinal cord, and posterior longitudinal ligament.

Illustration of the venous system (veins) draining to the heart in a male figure, frontal view.