NEET PG DENTAL EXAM

EMBRYOLOGY

PHARYNGEAL ARCHES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is the embryological origin of the hyoid bone?
A
1st arch
B
1st and 2nd arches
C
2nd arch
D
2nd and 3rd arches
Explanation: 

Detailed explanation-1: -We propose that: (i) the hyoid body originates from the hypobranchial eminence via the midline condensation; (ii) the lesser horn originates from the caudal end of Reichert′s cartilage; and (iii) the greater horn of the hyoid and the superior cornu of the thyroid cartilage originate from the third arch cartilage.

Detailed explanation-2: -The second pharyngeal arch cartilage (Reichert’s cartilage) ossifies at its ventral and dorsal aspects to give rise to the stapes, long limb of incus, styloid process of temporal bone, superior part and the lesser cornu of the hyoid bone, respectively.

Detailed explanation-3: -The second pharyngeal arch, also called the hyoid arch, gives rise to the lesser cornu of the hyoid and the upper part of the body of the hyoid.

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