(os )

(os′ă)
pl. ossa [L. os, stem oss-, bone]
Bone; a bone.
SEE: bone

os calcis

SEE: Calcaneus.

os coxae

SEE: Innominate bone.

os hamatum

The hooked bone on the ulnar side of the distal row of the carpus (wrist).
SYN: SEE: unciform bone

os hyoideum

The horseshoe-shaped bone lying at the base of the tongue.
SYN: SEE: hyoid bone

os ilium

SEE: Ilium.

os innominatum

The innominate (hip) bone.

os magnum

The third bone in the second distal row of the carpus.
SYN: SEE: capitatum

os orbiculare

The tiny bone in the ear that becomes attached to the incus, forming the lenticular process.

os peroneum

A bone occasionally found in the tendon of the peroneus longus muscle.

os planum

1. Any bone that has only a slight thickness; a flat bone.
2. The orbital plate of the ethmoid bone.

os pubis

The anteroinferior part of the hip bone; the pubic bone. In the adult, it and the ilium and ischium form the pelvic bone. The superior and inferior rami unite medially to form the pubic symphysis; at its lateral end the pubic bone forms part of the acetabulum.

os scaphoideum

SEE: Scaphoid bone.

os temporale

SEE: Temporal bone.

os trigonum

A bone of the foot that develops from an extra center of ossification along the posterior surface of the talus.

os unguis

SEE: Lacrimal bone.

os vesalianum

A bone that develops from the ossification of the posterior tubercle of the fifth metatarsal.