(biology) The cell membrane.

(anatomy) A bony element covered by cartilaginous tissue; an endochondral bone.

plural of membrane-bone

(anatomy) A broad fibroelastic sheet that connects the upper margin of the thyroid cartilage to the hyoid bone.

plural of Jacob's membrane

(pathology) During pregnancy, a premature rupture in which amniotic fluid is discharged from the uterus and vagina putting encumbent infant at risk for infection.

(anatomy) A thin membrane that lines the ligamentous surfaces of joint capsules, tendon sheaths where free movement is necessary, and bursae; it is composed of dense connective tissue and secretes synovial fluid.

(anatomy) A thin membrane that secretes serum lining an internal body cavity, such as the peritoneum, the pericardium, and the pleura.

(anatomy) A membrane which secretes mucus. It forms the lining of various body passages that communicate with the air, such as the respiratory, genitourinary, and alimentary tracts including the mouth, nasal passages, vagina and urethra.

A transparent protective fold of skin acting as an inner eyelid in birds, reptiles and some mammals.