ulna

(redirected from ulnas)
Also found in: Dictionary, Thesaurus, Encyclopedia.

ulna

 [ul´nah] (L.)
the inner and larger bone of the forearm, on the side opposite the thumb. It articulates with the humerus and with the head of the radius at its proximal end; with the radius and bones of the carpus at the distal end.

ul·na

, gen. and pl.

ul·nae

(ŭl'nă, ŭl'nē), [TA]
The medial and larger of the two bones of the forearm.
Synonym(s): cubitus (2)
[L. elbow, arm, fr. G. ōlenē]

ulna

(ŭl′nə)
n. pl. ul·nas or ul·nae (-nē)
1. The bone extending from the elbow to the wrist on the side opposite to the thumb in humans.
2. A corresponding bone in the forelimb of other vertebrates.

ul′nar adj.

ul·na

pl. ulnae (ŭl'nă, -nē) [TA]
The medial and larger of the two bones of the forearm.
Synonym(s): cubitus (2) [TA] .
[L. elbow, arm, fr. G. ōlenē]

ulna

One of the pair of forearm long bones. The ulna is on the little finger side. At its upper end it has a hook-like process, the olecranon, that fits into a hollow at the back of the lower end of the upper arm bone (the humerus) and prevents the elbow from over-extending. When the hand is turned on the long axis of the arm, the radius bone rotates around the ulna.

ulna

the posterior of the two bones of the forearm of TETRAPODS which articulates proximally with the HUMERUS and distally with the CARPALS. see PENTADACTYL LIMB.

ul·na

(ŭl'nă, -nē) [TA]
The medial and larger of the two bones of the forearm.
Synonym(s): cubitus (2) [TA] .
[L. elbow, arm, fr. G. ōlenē]
References in periodicals archive ?
Left ulna of the rose-breasted cockatoo described in Figure 1 with multifocal disruption of the cortex (arrows) and invasion of the medulla by well-differentiated adipocytes (asterisks) (hematoxylin and eosin stain, bar= 100 ([micro]m).
Por lo anterior y con la finalidad de aportar detalles sobre algunas caracteristicas biometricas de estos foramenes, efectuamos un estudio de estos en los huesos humero, ulna y radio.
--Distancia entre el foramen nutricio y el punto mas alto de la incisura troclear en la ulna.
--Distancia existente entre el foramen nutricio y el margen medial del humero y margen interoseo de la ulna y el radio.
En la ulna derecha se presento en su cara anterior en 80% de los casos y en un 20% en su margen anterior; en la ulna izquierda lo observamos en el 100% de los casos en su cara anterior.
In quadrupedal locomotion primates like Galago senegalensis the lateral surface of the ulna has a groove in the proximal two-thirds (Stevens et al, 1977), differing from Saguinus leucopus that has this groove throughout the ulna for the origin of the deep extensor muscles.
It has a rudimentary form or sometimes it is highly marked as in the Lemur (Mivart) and our findings in Saguinus leucopus, which must have been formed by the constant pressure of the pronator quadratus on the ulna for a quadrupedal locomotion to be performed, as it requires a longer pronation of the forearm and hand.
Since the supinator muscle does not have ulnar origin, the ulna of Saguinus leucopus does not form a supinator crest as it does in humans (Standring; Moore et al.) and as it should happen in nonhuman primates whose ulnar origin lies in the supinator muscle (Cribillero et al., 2009; Michilsens et al, 2009; Aversi-Ferreira et al, 2010; Diogo et al, 2012; Diogo & Wood, 2012).
The olecranon tuberosity, the anconeous process and both coronoid processes are described in the ulna of domestic mammals (Dyce et al.) and the terms are found in the terminology of the NominaAnatomica Veterinaria (ICVGAN) but not in the Terminologia Anatomica for the human (FICAT, 1998), which is the basis primate for comparisons.
The HA granules (0.2 mL) were implanted in the CSD of the ulna (Fig 1).
DBM and HA combination bone grafts: In the remaining 12 birds, tubular DBM combined with HA (0.2 mL) granules were implanted in the 1-cm defect of the ulna (Fig 2).
A section of latex Penrose drain tubing was inserted over the top of the ESF pins, parallel to and above the ulna. The latex tubing was then filled with 10 mL of acrylic material with a plastic syringe.