septum (sep'tum)

A thin partition. alveolar septa. The walls of the pulmonary alveoli which project into the infundibula. inter auricular s. The s. between the right and left auricles of the heart, inter muscular septa. Proce es of fascia which dip down between the muscles, often serving as their origins. inter nasal s. See s. narium. interventricular s. The partition between the ventricles of the heart, longitudinal septa of the spinal cord. Its anterior and posterior median fi ures, recto vaginal s. The structure which forms the partition between the rectum and the vagina, including the adjacent walls of those organs and the connective ti ue between them at the upper part. s. aorticum. The anterior segment of the mitral valve, s. atriorum (cord is), s. auricula rum. See inter auricular s. s. bulb i urethrae. A thin longitudinal fibrous s. in the posterior part of the bulb of the urethra, s. femoris. A thickening of the cancellous ti ue of the femur at the union of the neck and shaft, s. linguae. A vertical longitudinal plate of fibrous ti ue in the root of the tongue (to which it is usually limited) and attached to the body of the hyoid bone. s. lucidum. The delicate triangular s. separating the lateral ventricles of the brain. It is formed of two thin laminae which inclose the fifth ventricle between them. s. narium. The median portion, composed of cartilage and bone, which separates the cavity in the nose into two parts, s. narium mobile. The lower, mobile portion of the s. narium, made up of the thickened integument separating the nostnls. s. narium o eum. The partition formed by the perpendicular plate of the ethmoid bone and the vomer, s. of the nose. See s. narium. s. of the pons Varolii. A band of mesial fibers which halves the pons Varolii more or le incompletely, especially in its posterior part. s. of the scrotum. An anteroposterior partition derived from the dartos, which divides the cavity of the scrotum into two parts, s. pectin i for me. The fibrous s. between the two corpora cavernosa of the penis, so called on account of a number of parallel slits in it. s. pellucidum. See s. lucidum. s. sinuum sphenoidalium. A thin bony s. between the sphenoidal sinuses, s. tenue. See 5. lucidum. s. testis. See corpus Highmori, under corpus, s. tubae. A bony division which separates the eustachian tube from the bony furrow containing the tensor tympani. transverse s. A partition placed at right angles to the axis of a body. ure thro vaginal s. The partition between the urethra and the vagina, ventricular s. See interventricular s. vesicovaginal s. The partition between the bladder and the vagina. [Lat., from sepire, to fence in.]