fossa

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Related to articular fossa: Articular tubercle

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

/fos·sa/ (fos´ah) pl. fos´sae   [L.] a trench or channel; in anatomy, a hollow or depressed area.
acetabular fossa  a nonarticular area in the floor of the acetabulum.
adipose fossae  subcutaneous spaces in the female breast which contain fat.
axillary fossa  the small hollow underneath the arm where it joins the body at the shoulder.
canine fossa  a depression on the external surface of the maxilla superolateral to the canine tooth socket.
condylar fossa  either of two pits on the lateral part of the occipital bone.
coronoid fossa of humerus  a depression in the humerus for the coronoid process of the ulna.
cranial fossa  any one of three hollows (anterior, middle, and posterior) in the base of the cranium for the lobes of the brain.
digastric fossa 
1. a depression on the inner surface of the mandible, giving attachment to the anterior belly of the digastric muscle.
digital fossa 
3. the depression on the inside of the anterior abdominal wall lateral to the lateral umbilical fold.
duodenojejunal fossa  either of two peritoneal pockets, one behind the inferior and the other behind the superior duodenal fold.
epigastric fossa 
1. a fossa in the epigastric region.
ethmoid fossa  the groove in the cribriform plate of the ethmoid bones, for the olfactory bulb.
hyaloid fossa  a depression in the front of the vitreous body, lodging the lens.
hypophysial fossa  a depression in the sphenoid, lodging the pituitary gland.
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 of maxilla  a slight depression on the anterior surface of the maxilla above the incisor teeth.
infraspinous fossa  the large, slightly concave area below the spinous process on the dorsal surface of the scapula.
infratemporal fossa  an irregularly shaped cavity medial or deep to the zygomatic arch.
ischioanal fossa , ischiorectal fossa a potential space between the pelvic diaphragm and the skin below it; an anterior recess extends a variable distance between the pelvic and urogenital diaphragms.
Jobert's fossa  a fossa in the popliteal region bounded by the adductor magnus and the gracilis and sartorius muscles.
lacrimal fossa  a shallow depression in the roof of the orbit, lodging the lacrimal gland.
lateral cerebral fossa  sylvian fossa; in the fetus, a depression on the lateral surface of each cerebral hemisphere; it becomes the sylvian fissure and its floor becomes the insula.
mandibular fossa  a depression in the temporal bone in which the condyle of the mandible rests.
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 vaginal vestibule between the vaginal orifice and the frenulum of the pudendal labia.
2. the lateral expansion of the urethra of the glans penis.
3. 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.
ovarian fossa  a shallow pouch on the posterior surface of the broad ligament, in which the ovary is located.
popliteal fossa  the depression in the posterior region of the knee.
rhomboid fossa  the floor of the fourth ventricle, made up of the dorsal surfaces of the medulla oblongata and pons.
Rosenmüller's fossa  pharyngeal recess.
subarcuate fossa of temporal bone  a depression in the posterior inner surface of the petrous portion of the temporal bone.
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.
sylvian fossa 
tibiofemoral fossa  a space between the articular surfaces of the tibia and femur mesial or lateral to the inferior pole of the patella.
trochanteric fossa  a depression on the medial surface of the greater trochanter, receiving the tendon of the obturator externus muscle.
urachal fossa  one on the inner abdominal wall, between the urachus and the hypogastric artery.
Waldeyer's fossa  the two duodenal fossae regarded as one.
zygomatic fossa  infratemporal f.

fossa

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

fos′sate′ (fŏs′āt′) adj.

fossa

[fos′ə] pl. fossae
Etymology: L, ditch
a hollow or depression, especially on the surface of the end of a bone, such as the olecranon fossa or the coronoid fossa.

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

longitudinal depression
  • inguinal fossa depression at junction of lower abdominal wall and anterior aspect of upper leg; it is traversed by the femoral artery, which can be palpated at this point

  • popliteal fossa diamond-shaped area of soft tissue posterior to knee joint, bounded by the hamstrings superiorly and the two heads of gastrocnemius inferiorly, and containing, deep within the fossa, popliteal vessels, lymph nodes (which drain heel and lateral foot areas) and tibial nerve (terminal branch of sciatic nerve), which divides to subserve gastrocnemius, plantaris, soleus and popliteus muscles, cutaneous branches as the sural nerve, and articular branches to the knee joint (genicular nerves)

fossa (fäˑ·s),

n dent or visibly lowered area, particularly on the surface of a bone end.

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.

fossa(e) (fos´ə),

n a pit, hollow, or depression on a tooth or bone.
Enlarge picture
Fossa.
fossa, articular,
n a concave structure situated adjacent to the articular eminence on the temporal bone of the skull. Also known as the
mandibular fossa.
fossa, canine,
n the fossa in the canine maxilla superior to the apex of the canine tooth.
fossa, depth of,
n on the occlusal table, the distance from the top of the shorter cusp downward into the bottom of the fossa.
fossa, lateral,
n a shallow, concave area of peritoneum on the rear wall of the abdominal cavity, bordered by the lateral umbilical fold and the inguinal ligament.
fossa, mental,
n a depression located between the alveolar and mental ridges of the roots of the incisors.
fossa, nasal,
n a depression located between the maxilla and the sphenoid bone in the anatomy of the skull.
fossa, sublingual,
n a depression found underneath the tongue, adjacent to the sublingual glands.
fossa, submandibular,
n a depression found underneath the internal oblique ridge, which houses the submandibular salivary gland.

fossa

pl. fossae [L.] a trench or channel; a hollow or depressed area.

acetabular fossa
the nonarticular part of the acetabulum.
amygdaloid fossa
the depression in which the palatine tonsil is lodged in some species.
cerebral fossa
any of the depressions on the floor of the cranial cavity.
lateral cerebral fossa
see vallecula sylvii.
fossa clitoridis
the cavity in which the glans clitoridis resides.
condylar fossa, condyloid fossa
either of depressions lateral to the occipital condyles.
coronoid fossa
a depression in the humerus for the coronoid process of the ulna. Called also radial fossa.
cranial fossa
any one of the three hollows (rostral, middle and caudal) in the base of the cranium for the lobes of the brain.
ethmoid fossa
the hollow in the cribriform plate of the ethmoid bones, for the olfactory bulb.
fossa glandis
depression at the end of the stallion glans penis, housing the urethral process; it harbors smegma and potential pathogens.
glenoid fossa
mandibular fossa.
hyaloid fossa
a depression in the front of the vitreous body, lodging the lens.
hypophyseal fossa, hypophysial fossa
a depression in the sphenoid lodging the pituitary gland; called also pituitary fossa.
infratemporal fossa
an irregularly shaped cavity medial or deep to the zygomatic arch.
intercrural fossa
the fossa between the cerebral peduncles.
interpeduncular fossa
a triangular depression between the crura cerebri.
ischiorectal fossa
a potential space between the pelvic diaphragm, the ischium and the skin.
lacrimal sac fossa
excavated from the lacrimal bone and housing the lacrimal sac.
lingual fossa
the transverse groove on the dorsum of the bovine tongue between the torus and the tip.
mandibular fossa
a depression in 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.
nasal fossa
the right or left half of the nasal cavity.
fossa nudatae
see synovial fossa (below).
olecranon fossa
between the epicondylar crests at the distal end of the humerus; receives the anconeal process of the ulna.
fossa ovalis cordis
a fossa in the right atrium of the heart; the remains of the fetal foramen ovale.
ovarian fossa
a shallow depression on the surface of the mare's ovary. Called also ovulation fossa.
paralumbar fossa
the hollow of the flank, bounded dorsally by the transverse processes of the lumbar vertebrae, cranially by the last rib and caudally by the muscles of the thigh.
pituitary fossa
hypophyseal fossa.
radial fossa
see coronoid fossa (above).
rhomboidal fossa
floor of the fourth ventricle.
supracondylar fossa
the depression between the condyles of the femur.
supraspinous fossa
a depression cranial to the spine of the scapula.
synovial fossa
depressed, cartilage-free islands in large articular cartilages; no function has been determined for them. Called also fossa nudatae.
temporal fossa
an area on the side of the cranium bounded by the temporal line and the zygomatic arch, lodging the temporal muscle.
trochanteric fossa
the deep fossa at the proximal end of the femur between the greater and lesser trochanters.

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)

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