Organ

The heart is a muscular organ about the size of a fist, located in the mediastinum between the lungs. It pumps approximately 5 lit...

The brain is the most complex organ, containing approximately 86 billion neurons and a roughly similar number of glial and other n...

The lungs are paired organs in the thoracic cavity separated by the mediastinum. The right lung has three lobes upper, middle, low...

The liver is the largest internal organ, weighing approximately 1.5 kg in adults, located in the right upper quadrant beneath the ...

The kidneys are paired bean shaped organs approximately 10 to 12 cm long, located retroperitoneally at the level of T12 to L3 vert...

The stomach is a J shaped muscular organ between the esophagus and duodenum, with four regions cardia, fundus, body, and pylorus. ...

The small intestine is approximately 6 to 7 meters long in vivo shorter post mortem due to muscle relaxation and has three segment...

The large intestine colon is approximately 1.5 meters long and includes the cecum, ascending colon, transverse colon, descending c...

The pancreas is a dual function organ located retroperitoneally behind the stomach. Exocrine function 95 percent of organ produces...

The spleen is the largest lymphoid organ, approximately 12 cm long and 150 to 200 grams, located in the left upper quadrant protec...

The skin is the largest organ, weighing several kilograms and covering roughly 2 square meters in adults. It has three layers: epi...

The eye is a sphere approximately 24 mm in diameter with three layers. The outer fibrous layer includes the cornea transparent, av...

The ear has three divisions. The outer ear includes the auricle pinna collecting sound and the external auditory canal 2.5 cm lead...

The tongue is a muscular organ in the oral cavity involved in taste, speech, mastication, and swallowing. It has intrinsic muscles...

The nose and nasal cavity warm, humidify, and filter inspired air and provide the sense of smell. The external nose has bone nasal...

The esophagus is a muscular tube approximately 25 cm long connecting the pharynx to the stomach. It passes through the diaphragm a...

The gallbladder is a pear shaped sac approximately 7 to 10 cm long located under the liver, storing and concentrating bile between...

The urinary bladder is a hollow muscular organ in the pelvis that stores urine produced by the kidneys. It holds approximately 300...

The pituitary gland hypophysis is a pea sized gland approximately 0.5 grams sitting in the sella turcica of the sphenoid bone, con...

The thyroid gland is a butterfly shaped organ in the anterior neck at the level of C5 to T1, wrapping around the trachea. It has t...

The adrenal glands are paired triangular organs atop each kidney, weighing approximately 4 to 6 grams each. Each gland has two dis...

The cerebellum little brain is located behind the brainstem, containing more than half of all neurons in the brain despite making ...

The diaphragm is the primary muscle of inspiration, a dome shaped sheet separating the thoracic and abdominal cavities. It origina...

The ovaries are paired almond shaped organs approximately 3 cm long on either side of the uterus. They produce ova eggs and hormon...

The testes are paired oval organs in the scrotum, outside the body cavity for optimal temperature 2 to 3 degrees below body temper...

The uterus is a pear shaped muscular organ approximately 7.5 cm long in nonpregnant women, expanding to 30 cm during pregnancy. It...

The prostate is a walnut sized gland approximately 20 grams surrounding the urethra below the bladder in males. Its secretions mak...

The vocal cords, more precisely called the vocal folds, are two infoldings of mucous membrane stretched across the larynx from the...

The major salivary glands produce approximately 1 to 1.5 liters of saliva daily. Three pairs: parotid largest, near the ear, Stens...

The tonsils are lymphoid tissue at the entrance of the throat pharynx, forming Waldeyer ring. Palatine tonsils the commonly remove...

The pineal gland is a small pea sized organ approximately 5 to 8 mm near the center of the brain, behind the third ventricle. It p...

The parathyroid glands are four small glands approximately 5 mm each, located on the posterior surface of the thyroid gland. They ...

The appendix vermiformis is a worm shaped tube approximately 8 to 10 cm long attached to the cecum at the beginning of the large i...

The hypothalamus is a small region the size of an almond at the base of the brain below the thalamus, forming the floor and walls ...

The spinal cord is approximately 45 cm long, extending from the foramen magnum to the conus medullaris at L1 to L2 in adults. It g...

Adults have 32 teeth: 8 incisors cutting, 4 canines tearing, 8 premolars crushing, 12 molars grinding including 4 wisdom teeth thi...

The breasts mammary glands are modified sweat glands located on the anterior chest wall over the pectoralis major. Each breast has...

The bronchi are the conducting airways branching from the trachea. The right main bronchus is wider, shorter, and more vertical th...

The trachea, or windpipe, is a tube that runs from the bottom of the larynx down into the chest, where it divides at the carina in...

The larynx, or voice box, is a framework of cartilages, muscles, and ligaments at the top of the trachea. Its largest cartilage, t...

The pharynx, or throat, is a muscular tube that extends from the base of the skull to the level of the cricoid cartilage, where it...

The duodenum is the first and shortest part of the small intestine, forming a C shaped curve around the head of the pancreas betwe...

The rectum is the final straight section of the large intestine, lying in the pelvis in front of the sacrum and continuing from th...

The ureters are two muscular tubes, each roughly 25 to 30 centimeters long in adults, that carry urine from the renal pelvis of ea...

The urethra is the tube that carries urine from the bladder to the outside of the body. It differs considerably between the sexes....

Lymph nodes are small, bean shaped organs distributed along the lymphatic vessels, and the body contains several hundred of them, ...

The thymus is a soft, two lobed lymphoid organ in the upper front part of the chest. It is relatively large in infancy and childho...

The placenta is a temporary organ that develops in the uterus during pregnancy, formed largely from tissues of the embryo and conn...

The fallopian tubes, or uterine tubes, are a pair of slender muscular tubes extending from the upper corners of the uterus toward ...

The cervix is the lower, narrow, cylindrical part of the uterus that projects into the upper vagina. A canal runs through its cent...

The penis is the external male organ through which both urine and semen leave the body through the urethra. It consists of a root ...