Ossification of ulna

Ossification of ulna
Plan of ossification of the ulna. From three centers.
Epiphysial lines of ulna in a young adult. Lateral aspect. The lines of attachment of the articular capsules are in blue.

The ulna is ossified from three centers: one each for the body, the inferior extremity, and the top of the olecranon.

Ossification begins near the middle of the body, about the eighth week of fetal life, and soon extends through the greater part of the bone.

At birth the ends are cartilaginous.

About the fourth year, a center appears in the middle of the head, and soon extends into the styloid process.

About the tenth year, a center appears in the olecranon near its extremity, the chief part of this process being formed by an upward extension of the body.

The upper epiphysis joins the body about the sixteenth, the lower about the twentieth year.

v · d · eEmbryology of bones, joints, and muscles (GA 2.80, TE E5.0-2)
Ossification
Ossification of humerus · Ossification of ulna · Ossification of radius
Lower limb
Head

cranium: Ossification of occipital bone · Ossification of frontal bone · Ossification of temporal bone · Ossification of sphenoid · Ossification of ethmoid

facial bones: Ossification of vomer (Sutura vomerina · Foramen vomerinum · Meatus vomerinus · Fissura vomerina) · Ossification of maxilla · Ossification of mandible
Other
Other

M: BON/CAR

anat(c/f/k/f, u, t/p, l)/phys/devp/cell

noco/cong/tumr, sysi/epon, injr

proc, drug(M5)

M: JNT

anat(h/c, u, t, l)/phys

noco(arth/defr/back/soft)/cong, sysi/epon, injr

proc, drug(M01C, M4)

M: MUS, DF+DRCT

anat (h/n, u, t/d, a/p, l)/phys/devp/hist

noco(m, s, c)/cong(d)/tumr, sysi/epon, injr

proc, drug (M1A/3)

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