FOLD 



266 



FONTANEL 



tweezers used to convey the foil to the cavity in the 

 tooth. F. Crimpers, an instrument for folding foil. 

 Fold. (See Illus. Diet.) F.s, Amniotic, F.s of the 

 Amnion. See Head-fold and Tail-fold (Illus. Diet. ) 

 and P., Lateral Amniotic. F., Anterior Amniotic, 

 F., Anterior, of the Blastoderm, the cephalic fold. 

 F.s of the Axilla, the anterior and posterior walls of 

 the axilla. F., Caudal. See Tail-fold (Illus. Diet. ). 

 F., Cephalic. See Head-fold (Illus. Diet.). F., 

 Choroidal, the transverse cerebral fissure. F., Cir- 

 cular, one in the mucosa of the tympanum extending 

 between the head of the malleus, its long process, the 

 receptacle and tendon of the tympanic tensor. F., 

 Cordal, one in the mucosa of the tympanum enclosing 

 the tympanic branch of the facial nerve and attaching 

 it to the tympanic scute between the incus and mal- 

 leus. F., Costocolic, extends from the diaphragm 

 opposite the tenth and eleventh ribs to the splenic 

 flexure of the colon, and forms a shelf-like structure 

 above whicl lies the spleen. F., Douglas'. See 

 Douglas 1 Semilunar Fold ( Illus. Diet.). F.s, Doug- 

 las'. See Rectouterine Folds (Illus. Diet.). F.s, 

 Duncan's, the folds of the loose peritoneal covering 

 of the uterus seen immediately after delivery. F., 

 Entosylvian, the insula. F., Exoccipital, the tip 

 of the occipital lobe. F., Falcate, one in the mucosa 

 of the tympanum running backward from the suspen- 

 sory fold between the malleus and the incus internally 

 and the lower border of the tympanic scute externally. 

 F., Falcial, the part of the callosal gyrus lying ven- 

 trad of the genu of the callosum. F., Genitoenteric, 

 an anomalous fold of peritoneum lying between the 

 broad ligament and the base of the mesentery of the 

 sigmoid flexure. Syn., Plica genitoenterica. F.s, 

 Glossoepiglottic, three folds in the mucosa extending 

 from the base of the tongue to the epiglottis. F., 

 Head. See Head-fold (Illus. Diet.). F., Hen- 

 sing's, a more or less triangular fold of the peritoneum 

 which is attached to the abdominal wall from the lower 

 extremity of the kidney to the iliac fossa by its lower 

 border, and to the posteroexternal aspect of the colon, 

 at times also to the cecum, by its anterior or internal 

 border The apex is fixed in the lumbar fossa, the 

 lower free border extending from the iliac fossa to the 

 intestine. Syn., Parietocolic fold; Superior ligament 

 of the cecum. F.s, Houston's. See under Houston 

 (Illus. Diet.). F., Hypoblastic, a fold of the hypo- 

 blast extending dorsally and in contact with the rudi- 

 mentary central nervous system and ultimately giving 

 origin to the notochord. F., Ileoappendicular. See 

 F., Treves' Bloodless. F.s, Ileocecal. See Pouches, 

 Ileocecal (Illus. Diet.). F., Ileocolic, a semilunar 

 fold of the peritoneum which is attached to the anterior 

 layer of the mesentery, the anterior aspect of the as- 

 cending colon, and the cecum as far as the vermiform 

 appendix. Syn., Luschka' s fold. F., Lateral Am- 

 niotic, the folds of somatopleure on the sides of the 

 embryo which with the cephalic and caudal folds form 

 ultimately the amniotic sac. F., Marshall's Vesti- 

 gial. See under Marshall (Illus. Diet.). F., Mesen- 

 tericoparietal. See Ligament, Tz/ffier's Inferior. F., 

 Nelaton's, a transverse fold of mucosa at the junction 

 of the middle and lower thirds of the rectum, about IO 

 to 1 1 cm. above the anus. F., Parietocolic. See 

 F. , flensing' I. F.s, Pawlik's, the anterior columns 

 of the vagina which form the lateral boundaries of 

 Pawlik's triangle and serve as landmarks in locating 

 the openings of the ureters. F., Pituitary, the two 

 layers of dura enclosing the hypophysis. F.s, Pla- 

 cental, Minot's term for two folds in the uterine 

 mucosa at each side of the mesial line at the attached 

 side of the uterus of the rabbit and into which the 



allantois grows, forming the complete placenta. F., 

 Postmarginal. See Precuneus (Illus. Diet.). F., 

 Pterygomaxillary, a fold of mucosa in the mouth 

 dorsad of the last molar tooth and formed by the pro- 

 jection of the pterygomaxillary ligament. Syn., Plica 

 pterygomaxillaris. F.s, Rathke's, two projecting 

 folds of the fetal mesoderm which are placed between 

 the orifice of the intestine and the allantois, and unite 

 in the median line to form Douglas' septum. F.s, 

 Rectal, F.s of the Rectum. See Houston' s Valves 

 (Illus. Diet.). F.s, Rectouterine. See under 

 Rectouterine (Illus. Diet.). F.s, Rectovesical. 

 See under Rectovesical (Illus. Diet.). F., Rosen- 

 muller's. See Valve, Rosenmiiller' 1 s. F., Sacro- 

 sciatic. See White Line (Illus. Diet.). F., Sal- 

 pingonasal, the fold of mucosa extending from the 

 edge of the pharyngeal opening of the eustachian tube 

 to the posterior nares. F., Schultze's. See under 

 Schultze (Illus. Diet.). F.s, Semilunar (of peri- 

 toneum). See Rectouterine Folds (Illus. Diet.). F., 

 Stapedial, one in the tympanic mucosa enclosing the 

 stapes. F., Suspensory, a fold of the tympanic mu- 

 cosa continuous with the circular and falcate lobes, 

 proceeding from the suspensory ligament of the mal- 

 leus and extending between its head and the tympanic 

 tegmen. F.s, Synovial. See Glands of Havers (Illus. 

 Diet.). F., Tail-. Set Tail-fold. F., Tentorial, the 

 middle occipital gyrus. F., Thyroarytenoid, the in- 

 ferior or true vocal cord. F., Treves' Bloodless, a 

 quadrilateral fold of the peritoneum attached by its 

 upper border to the ileum, opposite the mesenteric 

 attachment, and by its lower border to themesoappendix 

 or to the appendix itself. The outer or right border is 

 attached to the inner aspect of the cecum as far down 

 as the appendix, the left or inner concave margin being 

 free. Syn., Ileoappendicular fold. F.s of the Tym- 

 panum. See F., Circular, P., Cordal, P., Falcate, 

 P., Stapedial, P., Suspensory. F., Urachal, the 

 peritoneum surrounding the urachus. Syn., Plica 

 urachi. F.s, Vesicouterine. See Vesicouterine 

 Folds (Illus. Diet.). F., Vestigial. See Marshall 's 

 Vestigial Fold (Illus. Diet.). F.s, Visceral, the in- 

 termediate thickenings between the visceral arches and 

 clefts of the lateral wall of the cervical region of the 

 embryo. 



Follicle, Folliculus. (See Illus. Diet.) F.s, Closed, 

 the solitary and agminated glands of. the small intestine. 

 F., Dental, the dental sac and its contents, the devel- 

 oping tooth. F., Hair, the depression containing the 

 root of the hair. F.s, Lieberkuhn's. See Crypts, 

 Lieberkiihri s{\\\w%. Diet.). F.s, Littre's. See Glands^ 

 Littrfs (Illus.Dict. ). F.s, Lymph, F.s, Lymphatic. 

 See Glands, Lymphatic (Illus. Diet.). F.s, Mal- 

 pighian. See under Malpighian (Illus. Diet.). F.s, 

 Mucous, the mucous glands. F.s, Nabothian. See 

 under Glands. F., Nail, the fold of matrix embracing 

 the root of the nail. F., Ovarian, the Graafian vesicle. 

 F.s, Palpebral, the meibomian glands. F.s, Pey- 

 erian, F.s, Peyer's, Peyer's glands. F., Solitary, 

 one of the small discrete lymph follicles found in the 

 intestinal mucosa. F., Spleen, F., Splenic, a mal- 

 pighian corpuscle. 



Folliculitis. (See Illus. Diet.) F. abscedens in- 

 fantum, follicular furunculosis of children. F., 

 Agminate, inflammation of a set of follicles. 



Folliculoma { fil-ik-u-lo'-mah). A tumor originating in 

 a follicle. F. ovarii malignum, a malignant tumor 

 of a graafian vesicle. 



Folliculosis (fol-ih-u-lc/sis). A disease of the fol- 

 licles. 



Fontanel. (See Illus. Diet.) 2. See Issue (Illus. 

 Diet.). F., Casser's, F. of Casserius. See 



