Human Anatomy Diagrams

Articulating Surfaces of the Wrist Joint Radius Articular Disk and Carpal Bones

Posted on June 11, 2026 by anatomy

The wrist joint involves articulation between the distal radius, articular disc, and proximal carpal bones. This anatomy diagram of the articulating surfaces of the wrist joint illustrates the scaphoid, lunate, and triquetrum articulating with the radius. It highlights the role View Diagram Articulating Surfaces of the Wrist Joint Radius Articular Disk and Carpal Bones→

The Sensory or Cutaneous Innervation of the Branches of the Sciatic Nerve

Posted on June 10, 2026 by anatomy

The cutaneous branches of the sciatic nerve provide sensory innervation to the posterior thigh, leg, and lateral foot via the posterior femoral cutaneous, sural, and other terminal branches. Knowledge of this sensory distribution is essential for surgeons, anesthetists, and medical View Diagram The Sensory or Cutaneous Innervation of the Branches of the Sciatic Nerve→

Prepubic and Infrapubic Angles of the Male Urethra

Posted on June 9, 2026 by anatomy

The prepubic and infrapubic angles of the male urethra refer to anatomical curves along the urethra that influence urinary flow and catheterization. Knowledge of these angles is essential for urologists, surgeons, and medical students in performing urethral instrumentation, managing strictures, View Diagram Prepubic and Infrapubic Angles of the Male Urethra→

Intraperitoneal and Retroperitoneal Organs

Posted on June 8, 2026 by anatomy

Intraperitoneal organs, such as the stomach and small intestine, are completely enveloped by visceral peritoneum, whereas retroperitoneal organs, including the kidneys and pancreas, lie behind it. Understanding the distinction is critical for surgeons, radiologists, and medical students in planning surgical View Diagram Intraperitoneal and Retroperitoneal Organs→

Mastoid Fossa Overview

Posted on June 7, 2026 by anatomy

The mastoid fossa is a depression within the temporal bone that houses the mastoid air cells and provides attachment for the sternocleidomastoid and other muscles. Its air cells communicate with the middle ear, playing a role in pressure regulation. Knowledge View Diagram Mastoid Fossa Overview→

Cricothyroid Muscle

Posted on June 6, 2026 by anatomy

The cricothyroid muscle is a small but very important muscle of the larynx. It connects the cricoid cartilage to the thyroid cartilage and works by tilting the thyroid cartilage forward. This movement stretches and tenses the vocal cords, which increases View Diagram Cricothyroid Muscle→

Course of the Supraorbital Nerve

Posted on June 5, 2026 by anatomy

The supraorbital nerve, a branch of the ophthalmic division of the trigeminal nerve, exits the supraorbital foramen to supply sensation to the forehead, scalp, and upper eyelid. Knowledge of its course is essential for ophthalmologists, plastic surgeons, and medical students View Diagram Course of the Supraorbital Nerve→

Arterial and Venous Supply to the Kidneys

Posted on June 4, 2026 by anatomy

The kidneys receive a rich vascular supply essential for filtration and homeostasis. This anatomy diagram of the arterial and venous supply to the kidneys illustrates the renal arteries branching directly from the abdominal aorta and entering the hilum. It highlights View Diagram Arterial and Venous Supply to the Kidneys→

Left Gastro Omental Artery

Posted on June 3, 2026 by anatomy

The left gastro-omental artery arises from the splenic artery along the greater curvature of the stomach. It supplies the stomachs fundus and body and contributes to anastomoses with the right gastro-omental artery. This vascular arcade is important for maintaining perfusion, View Diagram Left Gastro Omental Artery→

Structural Classifications of a Neurone

Posted on June 2, 2026 by anatomy

Neurones can be structurally classified as multipolar, bipolar, or unipolar (pseudounipolar). Multipolar neurones have one axon and multiple dendrites and are common in the central nervous system. Bipolar neurones have one axon and one dendrite and are found in sensory View Diagram Structural Classifications of a Neurone→

Distal End of the Spinal Cord The Lumbar Cistern

Posted on June 1, 2026 by anatomy

The distal end of the spinal cord includes the conus medullaris and lumbar cistern, containing cerebrospinal fluid and nerve roots of the cauda equina. The lumbar cistern extends from the conus to the sacral region, providing a safe site for View Diagram Distal End of the Spinal Cord The Lumbar Cistern→

Distinguishing Features of a Typical Thoracic Vertebrae

Posted on May 31, 2026 by anatomy

Typical thoracic vertebrae have distinguishing features including a heart-shaped vertebral body, costal facets for rib articulation, and long, downward-sloping spinous processes. They provide stability, support for the thoracic cage, and articulation for ribs. Knowledge of thoracic vertebra anatomy is essential View Diagram Distinguishing Features of a Typical Thoracic Vertebrae→

Suboccipital Triangle Borders and Vertebral Artery

Posted on May 30, 2026 by anatomy

The suboccipital triangle, located deep in the posterior neck, is bordered by the rectus capitis posterior major, obliquus capitis superior, and obliquus capitis inferior muscles. The vertebral artery and suboccipital nerve pass through this space. Knowledge of its borders and View Diagram Suboccipital Triangle Borders and Vertebral Artery→

Diagram of the Carpal Bones of the Hand

Posted on May 29, 2026 by anatomy

The carpal bones of the hand are eight small bones arranged in proximal and distal rows forming the wrist joint. These include the scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, capitate, and hamate. They articulate with the radius, ulna, metacarpals, and View Diagram Diagram of the Carpal Bones of the Hand→

Medullary Pyramids

Posted on May 28, 2026 by anatomy

The medullary pyramids are paired structures on the ventral surface of the medulla oblongata, containing corticospinal tracts responsible for voluntary motor control. Knowledge of pyramidal anatomy is essential for neurologists, neurosurgeons, and medical students in managing strokes, lesions, or neurodegenerative View Diagram Medullary Pyramids→

Muscles of Mastication Medial and Lateral Pterygoids

Posted on May 27, 2026 by anatomy

The muscles of mastication include the medial and lateral pterygoids, which move the mandible for elevation, protrusion, and side-to-side motion. The medial pterygoid elevates and assists in grinding, while the lateral pterygoid protracts and depresses the mandible. They are innervated View Diagram Muscles of Mastication Medial and Lateral Pterygoids→

Facial Vein Course and Tributaries

Posted on May 26, 2026 by anatomy

The facial vein collects venous blood from the superficial face, connecting with the angular, superior labial, and retromandibular veins. It communicates with the cavernous sinus via the ophthalmic veins, forming potential pathways for infection. Understanding its course is crucial in View Diagram Facial Vein Course and Tributaries→

Posterior View of the Venous Drainage of the Heart

Posted on May 25, 2026 by anatomy

Posterior venous drainage of the heart involves cardiac veins, including the coronary sinus, great, middle, and small cardiac veins, returning deoxygenated blood to the right atrium. Knowledge of venous anatomy is essential for cardiologists, cardiac surgeons, and medical students in View Diagram Posterior View of the Venous Drainage of the Heart→

Blood Supply to the Scaphoid Bone

Posted on May 24, 2026 by anatomy

The blood supply to the scaphoid bone is mainly through branches of the radial artery, entering via dorsal and volar surfaces. The proximal pole receives limited blood flow, making it susceptible to avascular necrosis following fractures. Knowledge of scaphoid vascular View Diagram Blood Supply to the Scaphoid Bone→

Ectopic Pregnancy

Posted on May 23, 2026 by anatomy

Ectopic pregnancy occurs when a fertilized egg implants outside the uterine cavity, most commonly in the uterine tube. As the embryo grows, it can cause stretching and eventual rupture of the tube, leading to severe internal bleeding. Patients often present View Diagram Ectopic Pregnancy→