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radial artery
Terminal branch of the brachial artery, irrigating the anterior part of the forearm and carpus.

radial collateral artery
Branch of the deep artery of the arm, irrigating the brachial and brachioradial muscles.

radial flexor muscle of wrist
Muscle connecting the medial epicondyle of the humerus to the second metacarpal; it allows the hand to flex and move away from the axis of the body (abduction).

radial nerve
Nerve arising from the brachial plexus, especially innervating the extensor muscles of the upper limb and fingers.

radial recurrent artery
Branch of the radial artery, irrigating the elbow and laterally irrigating certain arm muscles; it follows an upward course.

radial veins
Veins receiving in part the blood of the hand and then assisting in forming the brachial veins.

radialis indicis artery
Branch of the main artery of the thumb, irrigating the index finger.

Long paired bone forming, with the ulna, the skeleton of the forearm and articulating with several carpal bones.

ramus of mandible
Vertical part of the mandible, on either side of the body, articulating upward with the temporal bone.

Terminal segment of the large intestine, connecting with the outside by the anus and enabling defecation.

rectus sheath
Membrane covering the right muscle of the abdomen; its inner border assists in the formation of the linea alba.

recurrent interosseous artery
Branch of the posterior interosseous artery, irrigating the back of the elbow.

renal artery
Branch of the abdominal aorta, carrying blood to the kidney.

renal column
Extension of the renal cortex between two renal pyramids.

renal cortex
External part of the kidney containing the glomeruli.

renal impression of spleen
Part of the spleen in contact with the left kidney.

renal medulla
Middle part of the kidney, made up of renal pyramids.

renal pelvis
Funnel-shaped cavity formed by the union of calices and ending in the ureter.

renal veins
Veins carrying blood from the kidneys to the inferior vena cava.

retromandibular vein
Vein arising from the union of the maxillary and superficial temporal veins; it runs through the region of the parotid gland and joins with the posterior auricular vein to form the external jugular vein.

right atrium
Cavity of the heart, receiving deoxygenated blood from the venae cavae.

right colic flexure
Curvature formed by the colon between its ascending and transverse portions.

right coronary artery
Artery originating in the aorta and irrigating the right side of the myocardium.

right crus of diaphragm
Musculotendinous band securing the diaphragm to the vertebral column; it inserts into the first three lombar vertebrae, to the right of the aorta.

right inferior lobar bronchus
Twig of the main right bronchus, leading to the inferior lobe of the right lung.

right inferior pulmonary vein
Vein returning blood oxygenated in the inferior part of the right lung to the left atrium of the heart.

right lobe of liver
Main part of the liver, located to the right of the falciform ligament.

right lumbar lymph nodes
Abdominal nodes grouped near the inferior vena cava.

right lung
Respiratory organ divided into three lobes, in which blood from the right pulmonary artery is freed of carbon dioxide and enriched with oxygen.

right lymphatic duct
Vessel carrying lymph from the upper right section of the body to the terminal point of the right subclavian vein.

right main bronchus
Bronchus emanating from the trachea, allowing air to enter and exit the right lung.

right pulmonary artery
Branch of the pulmonary trunk, carrying deoxygenated blood to the right lung.

right semilunar cusp of the pulmonary valve
One of three components of the pulmonary valve, assisting in closing the orifice during ventricular systole.

right superior lobar bronchus
Twig of the main right brochus, leading to the superior lobe of the right lung.

right superior pulmonary vein
Vein returning blood oxygenated in the superior part of the right lung to the left atrium of the heart.

right suprarenal vein
Vein carrying blood from the right surrenal gland to the lower vena cava.

right testicular vein
In men, vein carrying blood from the right testicle to the inferior vena cava.

right triangular ligament of liver
Fold of the peritonium, connecting the right lobe of the liver to the diaphragm; it forms the right extremity of the coronary ligament.

right ventricle
Thin-walled cavity of the heart, propelling blood into the pulmonary trunk.

ring finger
Fourth digit of the hand; rings are traditionally worn on this finger, hence its name.

risorius muscle
Variable muscle extending from the fascia of the masseter muscle to the angle of the mouth; it especially allows smiling.

round ligament of liver
Remnant of the umbilical vein, extending from the navel to the hilum of the liver.

round pronator muscle
Muscle formed of two heads, connecting the humerus and ulna to the radius; it allows flexion and inward rotation (pronation) of the forearm.