- the muscular derivatives of the first pharyngeal arch are?
- the muscles of mastication
- masseter
- temporalis
- pterygoids
- mylohyoid
- tensor tympani
- tensor veli palatini
- anterior belly of digastric
answer: all of them are true . masseter , temporalis and pterygoids include the muscles of mastication . all these muscles have a single nerve supply by the mandibular branch of the trigeminal nerve .
- the skeletal derivatives of the first pharyngeal arch are?
- meckel’s cartilage
- part of malleus
- part of incus
- anterior malleolar ligament
- sphenomandibular ligament
answer: all of them are true . all of the above mentioned are skeletal derivatives of the first pharyngeal arch .
- the muscular derivatives of the second pharyngeal arch are?
- platysma
- stylohyoid
- posterior belly of digastric
- muscles of facial expression
- auricular muscles
- stapedius
- occipito frontalis
answer: all of them are true . all the above mentioned are infact the muscular derivatives of the second pharyngeal arch . facial nerve supplies all these muscles and so is the main nerve which supplies the second pharyngeal arch .
- the skeletal derivatives of the second pharyngeal arch are?
- part of malleus
- part of incus
- stapes
- stylohyoid ligament
- styloid process
- lesser cornu of the hyoid
- upper body of hyoid bone
answer: all the above .
- which of the following statements are true about the third pharyngeal arch ?
- the muscular derivative of the third pharyngeal arch is the stylopharyngeus
- the main nerve supply of the third pharyngeal arch is the glossopharyngeal nerve
- the skeletal derivative of the third pharyngeal arch is the greater cornu of the hyoid and the lower body of the hyoid bone .
- all are true
answer: d . all are true .
- which of the following statements are true ?
- the fourth arch forms the cricothyroid muscle with components of the fifth arch
- the nerve supply of the cricothyroid muscle is the superior or external laryngeal nerve .
- superior laryngeal nerve is a branch of the vagus nerve
- the sixth pharyngeal arch forms all the intrinsic muscles of the larynx except the cricothyroid
answer : all are true .
- find the true statements ?
- the nerve of the sixth pharyngeal arch is the recurrent laryngeal nerve
- recurrent laryngeal nerve is also a branch of the vagus nerve
- the skeletal derivative of the fourth pharyngeal arch is thyroid cartilatge
- the skeletal derivative of the sixth pharyngeal arch is the arytenoids cartilage
- the fifth pharyngeal arch combines with the fourth arch to form various structures but as such is less significant .
answer: all are true .
