fossa

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fossa

 [fos´ah] (pl. fos´sae) (L.)
a trench or channel; in anatomy, a hollow or depressed area.
amygdaloid fossa the depression in which the tonsil is lodged.
cerebral fossa any of the depressions on the floor of the cranial cavity.
condylar fossa (condyloid fossa) either of two pits on the lateral portion of the occipital bone.
coronoid fossa a depression in the humerus for the coronoid process of the ulna.
cranial fossa any one of the three hollows (anterior, middle, and posterior) in the base of the cranium for the lobes of the brain.
digastric fossa a depression on the inner surface of the mandible, giving attachment to the anterior belly of the digastric muscle.
epigastric fossa
1. one in the epigastric region.
ethmoid fossa the groove in the cribriform plate of the ethmoid bones, for the olfactory bulb.
glenoid fossa mandibular fossa.
hyaloid fossa a depression in the front of the vitreous body, lodging the lens.
hypophyseal fossa a depression in the sphenoid lodging the pituitary gland; called also pituitary fossa.
iliac fossa a concave area occupying much of the inner surface of the ala of the ilium, especially anteriorly; from it arises the iliac muscle.
incisive fossa a slight depression on the anterior surface of the maxilla above the incisor teeth.
infraclavicular fossa the triangular region of the chest just below the clavicle, between the deltoid and pectoralis major muscles.
infratemporal fossa an irregularly shaped cavity medial or deep to the zygomatic arch.
interpeduncular fossa a depression on the inferior surface of the midbrain, between the two cerebral peduncles, the floor of which is the posterior perforated substance.
ischiorectal fossa a potential space between the pelvic diaphragm and the skin below it; an anterior recess extends a variable distance.
mandibular fossa a depression in the inferior surface of the pars squamosa of the temporal bone at the base of the zygomatic process, in which the condyle of the mandible rests; called also glenoid fossa.
mastoid fossa a small triangular area between the posterior wall of the external acoustic meatus and the posterior root of the zygomatic process of the temporal bone.
nasal fossa the portion of the nasal cavity anterior to the middle meatus.
navicular fossa
1. the lateral expansion of the urethra of the glans penis.
2. a depression on the internal pterygoid process of the sphenoid, giving attachment to the tensor veli palatini muscle.
fossa ova´lis cor´dis a fossa in the right atrium of the heart; the remains of the fetal foramen ovale.
fossa ova´lis fe´moris the depression in the fascia lata that is bridged by the cribriform fascia and perforated by the great saphenous vein.
ovarian fossa a shallow pouch on the posterior surface of the broad ligament of the uterus in which the ovary is located.
paravesical fossa the fossa formed by the peritoneum on each side of the urinary bladder.
pituitary fossa hypophyseal fossa.
popliteal fossa the hollow at the posterior part of the knee.
subarcuate fossa a depression in the posterior inner surface of the pars petrosa of the temporal bone.
subpyramidal fossa a depression on the internal wall of the middle ear.
subsigmoid fossa a fossa between the mesentery of the sigmoid flexure and that of the descending colon.
supraspinous fossa a depression above the spine of the scapula.
temporal fossa an area on the side of the cranium bounded posteriorly and superiorly by the temporal lines, anteriorly by the frontal and zygomatic bones, and laterally by the zygomatic arch, lodging the temporal muscle.
tibiofemoral fossa a space between the articular surfaces of the tibia and femur mesial or lateral to the inferior pole of the patella.
urachal fossa one on the inner abdominal wall, between the urachus and the hypogastric artery.
vestibular fossa (fossa of vestibule of vagina) the vaginal vestibule between the vaginal orifice and the fourchette (frenulum of pudendal labia). Called also navicular fossa.

fos·sa

, gen. and pl.

fos·sae

(fos'ă, fos'ē), [TA]
A depression usually more or less longitudinal in shape below the level of the surface of a part.
[L. a trench or ditch]

fossa

(fŏs′ə)
n. pl. fossae (fŏs′ē′) Anatomy
A small cavity or depression, as in a bone.

fos′sate′ (fŏs′āt′) adj.

fos·sa

, pl. fossae (fos'ă, -ē) [TA]
A depression usually more or less longitudinal in shape below the level of the surface of a part.

fossa

A furrow or depression, especially in bone.

fossa

a depression, pit or cavity.

fossa

A depression or cavity below the surface level of a part.
hyaloid fossa A cup-shaped depression in the anterior vitreous body that accommodates the posterior part of the crystalline lens. It is actually separated from the lens itself by the postlenticular space of Berger. Syn. lenticular fossa; patellar fossa. See ligament of Wieger.
fossa for the lacrimal gland A depression in the frontal bone in which rests the orbital portion of the lacrimal gland, as well as some orbital fat which itself lies in the posterior part of the fossa called the accessory fossa of Rochon-Duvigneaud. The fossa is located behind the zygomatic process of the frontal bone in the anterior and lateral part of the orbital roof.
fossa for the lacrimal sac A vertical groove, some 5 mm deep and about 14 mm high, formed by the frontal process of the maxilla and lacrimal bones and which contains the lacrimal sac. The fossa is bounded by the anterior and posterior lacrimal crests coming from the maxilla (frontal process) and lacrimal bone respectively, with no definite boundary above. It leads downward to the nasolacrimal canal, which contains the nasolacrimal duct.
patellar fossa See hyaloid fossa.
trochlear fossa A small depression in the frontal bone which contains the pulley (or trochlea), a cartilaginous structure surrounded by a thick fibrous sheath 1 mm thick and through which passes the superior oblique muscle. The fossa is located about 4 mm behind the medial upper margin of the orbit.

fos·sa

, pl. fossae (fos'ă, -ē) [TA]
Longitudinal depression below the level of the surface of a part.

Patient discussion about fossa

Q. info on arachnoid cyst in the right posterior fossa

A. Basically it's like a small sac filled with fluid. The problem is that the skull is a rigid closed space, which means that if there's something other than the brain, it'll occupy space, usually on expense of the brains' space. These kinds of problems are often referred to as "space occupying lesion".

It's usually congenital (i.e. develops during pregnancy), and even when it cause symptoms they develop slowly.

YOu can read more here (http://en.wikipedia.org/wiki/Arachnoid_cyst)

More discussions about fossa