Medicine and Health related Information

a) The cartilage of 1st arch is called ” THE MECKELS CARTILAGE”. The INCUS and MALLEUS of the middle ear are derived from the dorsal end. The ventral part of the cartilage is surrounded by the developing mandible and is absorbed. The part of the cartilage extending from the region of the middle ear to the mandible disappears but its sheath forms the anterior ligament of malleus and the sphenomandibular ligament.

b) The cartilage of 2nd arch forms the following:-

1) STAPES
2) STYLOID PROCESS
3) STYLOHOID LIGAMENT from sheath
4) SMALLER (lesser) CORNUA OF HYOID
5) SUPERIOR PART OF THE BODY OF HYOID.

c) The following structures are derived from the cartilage of the 3rd arch:-

1) GREATER CORNUA OF HYOID BONE
2) LOWER PART OF THE BODY OF HYOID BONE

d) The cartilages of larynx are derived from 4th and 6th arches with a possible contribution from 5th arch but there exact derivation is controversial.