Items tagged “anatomy”

Arterial supply to the foot can be divided into plantar and dorsal components. Plantar arterial supply Posterior tibial artery  gives off its calcaneal branch  then divides into the medial and lateral plantar arteries Medial plantar artery branch of the posterior tibial artery smaller cal...

The triquetrum (also known as os triquetrum or - historically - as the triangular bone) is one of the carpal bones and forms part of the proximal carpal row. Gross anatomy Osteology The triquetrum is wedge-shaped carpal bone located between the lunate and the pisiform. It has an oval facet fo...

Anatomy encompasses any part of an organism's structure, position, and interrelation. Radiopaedia.org aims to eventually cover the entire human anatomy, particularly in relation to the practice of radiology. All articles use standard anatomic conventional nomenclature and the anatomic position. ...

The anterior commissure (AC) is a transversely oriented commissural white matter tract that connects the two cerebral hemispheres along the midline. It is a very important anatomical landmark that connects different parts of the limbic system on both sides and plays a role in the interhemispheri...

Agenesis of the right hepatic lobe is a rare variation in liver anatomy. Radiographic features absence of the right hepatic lobe absence of right hepatic artery, right portal vein, and right hepatic biliary system compensatory hypertrophy of the left hepatic lobe and caudate lobe possible r...

Agenesis of the left hepatic lobe is a rare variation in liver anatomy. It is clinically asymptomatic and discovered during imaging or surgery. Radiographic features absence of the left hepatic lobe (left of the falciform ligament, Couinaud segments 2 and 3) absence of left hepatic artery, le...

The oblique fissures (also called the major fissures or greater fissures) are bilateral structures in both lungs separating the lung lobes.  Gross anatomy Right oblique fissure The superior part of the right oblique fissure separates the right upper lobe from the right lower lobe and the infe...

The ulna (plural: ulnae) is one of the two long bones of the forearm, located medially in the supinated anatomic position. It has a larger proximal end and tapers to a smaller distal end (opposite to the radius). Gross anatomy Osteology Prominent features of the ulna include: proximal: olecr...

The cloaca is the terminal portion of the hindgut. It is an embryonic structure (weeks 4-7) in which the distal ends of the gastrointestinal tract and urogenital system share a common channel. The most distal aspect of the cloaca is termed the cloacal membrane. The cloaca, or portions of it, ca...

The conus artery is a small early branch off the right coronary artery (RCA) circulation. Gross anatomy Supply The artery has a variable distribution, but usually supplies a region of the anterior interventricular septum and the conus of the main pulmonary artery (hence its name). Variant an...

The lenticulostriate arteries, also known as anterolateral central arteries, are a collection of small perforating arteries arising from the anterior part of the circle of Willis and supplying the basal ganglia.  They are divided into: medial lenticulostriate arteries lateral lenticulostriate...

The obturator nerve is a large nerve arising from the lumbar plexus and the nerve of the medial compartment of the thigh. It arises from the anterior divisions of L2-4 in the lumbar plexus.  Gross anatomy Course Pelvis The nerve descends medial to psoas major to the obturator canal where it ...

The anterior tibial artery is the main arterial supply of the anterior compartment of the leg.  Gross anatomy The anterior tibial artery arises from the popliteal artery in the popliteal fossa and continues distally as the dorsalis pedis artery. Course The popliteal artery usually divides at...

The saphenous nerve is the continuation of the deep division of the femoral nerve in the femoral triangle. Gross anatomy runs within the subsartorial canal, giving off an infrapatellar branch (it also contributes to the subsartorial nerve plexus) curves behind sartorius, appearing behind the ...

Supradiaphragmatic liver has been reported as a very rare variant in liver morphology.  In this variant, liver tissue extends into the right hemithorax through an opening in the right hemidiaphragm. The tissue is connected to the right hepatic lobe by a pedicle. In one report, the caudate lobe ...

The terminal ileum (plural: ilea (rarely: ileums) is the most distal segment of small bowel. It immediately precedes the small bowel's connection with the colon through the ileocecal valve. It is of particular interest since a number of infectious and inflammatory processes preferentially involv...

The frontal bone is a skull bone that contributes to the cranial vault. It contributes to form part of the anterior cranial fossa. Gross anatomy The frontal bone has two portions: vertical portion (squama): has external/internal surfaces horizontal portion (orbital): has superior/inferior su...

The parietal bone is a paired, irregular, quadrilateral skull bone that forms the sides and roof of the cranium.  Gross anatomy The parietal bone has four borders, four angles, and external/internal surfaces. The four borders are: frontal sagittal occipital (half of lambdoid suture) squam...

The occipital bone, also known as C0, is a trapezoid skull bone that contributes to the posteroinferior part of the cranial vault. It is pierced by the foramen magnum, permitting communication from the cranial cavity to the vertebral canal. Terminology Occiput is a noun referring to the back o...

The sphenoid bone is a large, complex, unpaired bone forming the central parts of the anterior and central skull base. Gross anatomy Parts of the sphenoid bone include: body jugum sphenoideum contains the sphenoid sinus greater wing lesser wing pterygoid process and plates Articulations...