牛、羊及多数羚羊等哺乳动物的角。为长在头骨上的2个骨质角芯，外套中空的角质鞘。
Horns of cattle, sheep, and most antelopes and other mammals. These are two bony horn cores growing on the skull, covered by a hollow keratin sheath.

年幼的角。
Young Horn.

角组织发生骨化后的部分。
Horn material that has become ossified.

角内部的髓质组织。
Marrow tissue within horn cores.