The bone chain can be repaired using autograft of incus or cartilage. The resulting cloud is called "cumulonimbus incus". The short crus attaches to the posterior ligament of the incus. Embryologically it is derived from the first pharyngeal arch along with the incus. It is an intermediate stage between cumulonimbus calvus and cumulonimbus incus. This vibration is transmitted along the incus and stapes to the oval window. The tympanic membrane sets the malleus, incus, and stapes into vibration. The incus or anvil is a bone in the middle ear. It transmits the sound vibrations from the eardrum to the "incus". The malleus articulates to incus which connects to the stapes. The stapes articulates with the incus through the incudostapedial joint. The lenticular process of the incus participates in joint formation. The middle ear contains three tiny bones known as the ossicles&colon; "malleus", "incus", and "stapes". The malleus is attached to the tympanic membrane and articulates with the incus. Special attention is paid to low clouds and convective cloud particularly cumulonimbus incus clouds.